Jonathan W. Riess, MD, MS

A Danish population-based cohort study by Ehrenstein and colleagues involved 21,282 patients with non–small-cell lung cancer (NSCLC), 8758 of whom received a diagnosis at stage I-IIIA. Of those, 4071 (46%) were tested for epidermal growth factor receptor (EGFR) mutations at diagnosis. Median overall survival (OS) was 5.7 years among patients with EGFR mutation–positive status (n = 361) and 4.4 years among patients with EGFR mutation–negative status (n = 3710). EGFR mutation–positive status was associated with lower all-cause mortality in all subgroups. This is not surprising, because EGFR-mutated lung cancers are associated with never or light smoking history and the patients tend to be younger and have fewer medical comorbidities. Nevertheless, the lower risk for all-cause mortality was consistent across all subgroups (stage at diagnosis, age, sex, comorbidity, and surgery receipt), with hazard ratios (HR) ranging from 0.48 to 0.83. In addition, targeted therapies, such as osimertinib, improved OS and progression-free survival (PFS) in the metastatic setting as first-line treatment. Now that the ADAURA study has demonstrated a substantial disease-free survival benefit with osimertinib in the adjuvant setting in early-stage EGFR-mutated NSCLC (with final OS results still to come) it will be interesting to see whether this magnitude of difference in OS grows over time.

Wang and colleagues conducted a large meta-analysis of 10 retrospective studies and one prospective study including a total of 5892 patients with NSCLC who were receiving programmed cell death protein 1 (PD-1)/ programmed death-ligand 1 (PD-L1) inhibitors with the concomitant use of gastric acid suppressants (GAS). Use of PD-1/PD-L1 inhibitors with vs without GAS worsened PFS by 32% (HR 1.32; P < .001) and OS by 36% (HR 1.36; P < .001). The GAS in these studies were predominantly proton-pump inhibitors (PPI). There is still much to learn about medications that may influence outcomes to immune checkpoint blockade, such as steroids, antibiotics, GAS, and others. We are also learning that the microbiome probably plays an important role in contributing to activity of PD-1/PDL-1 antibodies and PPI may modify the microbiome. More research is needed, but it is reasonable to try and switch patients receiving PD-1/PDL-1 inhibitors from PPI to other GAS, if clinically appropriate.

Nazha and colleagues performed a SEER-Medicare database analysis evaluating 367,750 patients with lung cancer. A total of 11,061 patients had an initial prostate cancer diagnosis and subsequent lung cancer diagnosis, 3017 had an initial lung cancer diagnosis and subsequent prostate cancer diagnosis, and the remaining patients had an isolated lung cancer diagnosis. Patients who received androgen deprivation therapy (ADT) for a previously diagnosed prostate cancer showed improved survival after lung cancer diagnosis (adjusted HR for death 0.88; P = .02) and a shorter latency period to the diagnosis of lung cancer (40 vs 47 months; P < .001) compared with those who did not receive ADT. This finding applied mainly to White patients and may not apply to Black patients because there was an underrepresentation of Black patients in the study. The association of ADT for prostate cancer improving clinical outcomes in patients subsequently diagnosed with lung cancer is intriguing. There is known crosstalk between receptor kinase signaling and androgen receptor signaling that may biologically explain the findings in this study. This theoretically could apply more to certain molecular subtypes of lung cancer, such as EGFR-mutated lung cancer. However, further studies are needed to confirm this because confounding factors and immortal time bias (where patients receiving ADT may be more likely to have more frequent interactions in the healthcare system and thus receive an earlier lung cancer diagnosis) may in part explain the findings in this retrospective analysis. More research is needed to determine whether patients with prostate cancer receiving ADT had improved survival compared with those who did not receive ADT.

A Danish population-based cohort study by Ehrenstein and colleagues involved 21,282 patients with non–small-cell lung cancer (NSCLC), 8758 of whom received a diagnosis at stage I-IIIA. Of those, 4071 (46%) were tested for epidermal growth factor receptor (EGFR) mutations at diagnosis. Median overall survival (OS) was 5.7 years among patients with EGFR mutation–positive status (n = 361) and 4.4 years among patients with EGFR mutation–negative status (n = 3710). EGFR mutation–positive status was associated with lower all-cause mortality in all subgroups. This is not surprising, because EGFR-mutated lung cancers are associated with never or light smoking history and the patients tend to be younger and have fewer medical comorbidities. Nevertheless, the lower risk for all-cause mortality was consistent across all subgroups (stage at diagnosis, age, sex, comorbidity, and surgery receipt), with hazard ratios (HR) ranging from 0.48 to 0.83. In addition, targeted therapies, such as osimertinib, improved OS and progression-free survival (PFS) in the metastatic setting as first-line treatment. Now that the ADAURA study has demonstrated a substantial disease-free survival benefit with osimertinib in the adjuvant setting in early-stage EGFR-mutated NSCLC (with final OS results still to come) it will be interesting to see whether this magnitude of difference in OS grows over time.

Wang and colleagues conducted a large meta-analysis of 10 retrospective studies and one prospective study including a total of 5892 patients with NSCLC who were receiving programmed cell death protein 1 (PD-1)/ programmed death-ligand 1 (PD-L1) inhibitors with the concomitant use of gastric acid suppressants (GAS). Use of PD-1/PD-L1 inhibitors with vs without GAS worsened PFS by 32% (HR 1.32; P < .001) and OS by 36% (HR 1.36; P < .001). The GAS in these studies were predominantly proton-pump inhibitors (PPI). There is still much to learn about medications that may influence outcomes to immune checkpoint blockade, such as steroids, antibiotics, GAS, and others. We are also learning that the microbiome probably plays an important role in contributing to activity of PD-1/PDL-1 antibodies and PPI may modify the microbiome. More research is needed, but it is reasonable to try and switch patients receiving PD-1/PDL-1 inhibitors from PPI to other GAS, if clinically appropriate.

Nazha and colleagues performed a SEER-Medicare database analysis evaluating 367,750 patients with lung cancer. A total of 11,061 patients had an initial prostate cancer diagnosis and subsequent lung cancer diagnosis, 3017 had an initial lung cancer diagnosis and subsequent prostate cancer diagnosis, and the remaining patients had an isolated lung cancer diagnosis. Patients who received androgen deprivation therapy (ADT) for a previously diagnosed prostate cancer showed improved survival after lung cancer diagnosis (adjusted HR for death 0.88; P = .02) and a shorter latency period to the diagnosis of lung cancer (40 vs 47 months; P < .001) compared with those who did not receive ADT. This finding applied mainly to White patients and may not apply to Black patients because there was an underrepresentation of Black patients in the study. The association of ADT for prostate cancer improving clinical outcomes in patients subsequently diagnosed with lung cancer is intriguing. There is known crosstalk between receptor kinase signaling and androgen receptor signaling that may biologically explain the findings in this study. This theoretically could apply more to certain molecular subtypes of lung cancer, such as EGFR-mutated lung cancer. However, further studies are needed to confirm this because confounding factors and immortal time bias (where patients receiving ADT may be more likely to have more frequent interactions in the healthcare system and thus receive an earlier lung cancer diagnosis) may in part explain the findings in this retrospective analysis. More research is needed to determine whether patients with prostate cancer receiving ADT had improved survival compared with those who did not receive ADT.

A Danish population-based cohort study by Ehrenstein and colleagues involved 21,282 patients with non–small-cell lung cancer (NSCLC), 8758 of whom received a diagnosis at stage I-IIIA. Of those, 4071 (46%) were tested for epidermal growth factor receptor (EGFR) mutations at diagnosis. Median overall survival (OS) was 5.7 years among patients with EGFR mutation–positive status (n = 361) and 4.4 years among patients with EGFR mutation–negative status (n = 3710). EGFR mutation–positive status was associated with lower all-cause mortality in all subgroups. This is not surprising, because EGFR-mutated lung cancers are associated with never or light smoking history and the patients tend to be younger and have fewer medical comorbidities. Nevertheless, the lower risk for all-cause mortality was consistent across all subgroups (stage at diagnosis, age, sex, comorbidity, and surgery receipt), with hazard ratios (HR) ranging from 0.48 to 0.83. In addition, targeted therapies, such as osimertinib, improved OS and progression-free survival (PFS) in the metastatic setting as first-line treatment. Now that the ADAURA study has demonstrated a substantial disease-free survival benefit with osimertinib in the adjuvant setting in early-stage EGFR-mutated NSCLC (with final OS results still to come) it will be interesting to see whether this magnitude of difference in OS grows over time.

Wang and colleagues conducted a large meta-analysis of 10 retrospective studies and one prospective study including a total of 5892 patients with NSCLC who were receiving programmed cell death protein 1 (PD-1)/ programmed death-ligand 1 (PD-L1) inhibitors with the concomitant use of gastric acid suppressants (GAS). Use of PD-1/PD-L1 inhibitors with vs without GAS worsened PFS by 32% (HR 1.32; P < .001) and OS by 36% (HR 1.36; P < .001). The GAS in these studies were predominantly proton-pump inhibitors (PPI). There is still much to learn about medications that may influence outcomes to immune checkpoint blockade, such as steroids, antibiotics, GAS, and others. We are also learning that the microbiome probably plays an important role in contributing to activity of PD-1/PDL-1 antibodies and PPI may modify the microbiome. More research is needed, but it is reasonable to try and switch patients receiving PD-1/PDL-1 inhibitors from PPI to other GAS, if clinically appropriate.

Nazha and colleagues performed a SEER-Medicare database analysis evaluating 367,750 patients with lung cancer. A total of 11,061 patients had an initial prostate cancer diagnosis and subsequent lung cancer diagnosis, 3017 had an initial lung cancer diagnosis and subsequent prostate cancer diagnosis, and the remaining patients had an isolated lung cancer diagnosis. Patients who received androgen deprivation therapy (ADT) for a previously diagnosed prostate cancer showed improved survival after lung cancer diagnosis (adjusted HR for death 0.88; P = .02) and a shorter latency period to the diagnosis of lung cancer (40 vs 47 months; P < .001) compared with those who did not receive ADT. This finding applied mainly to White patients and may not apply to Black patients because there was an underrepresentation of Black patients in the study. The association of ADT for prostate cancer improving clinical outcomes in patients subsequently diagnosed with lung cancer is intriguing. There is known crosstalk between receptor kinase signaling and androgen receptor signaling that may biologically explain the findings in this study. This theoretically could apply more to certain molecular subtypes of lung cancer, such as EGFR-mutated lung cancer. However, further studies are needed to confirm this because confounding factors and immortal time bias (where patients receiving ADT may be more likely to have more frequent interactions in the healthcare system and thus receive an earlier lung cancer diagnosis) may in part explain the findings in this retrospective analysis. More research is needed to determine whether patients with prostate cancer receiving ADT had improved survival compared with those who did not receive ADT.

The Direct KRAS^G12C Inhibitor Adagrasib in Advanced KRAS^G12C-Mutant NSCLC: Results From a Registrational Phase 2 Study

KRAS mutations are detected in about one quarter of all lung adenocarcinomas and are the most common oncogene driver in non–small-cell lung cancer (NSCLC). KRAS^G12C amino acid substitutions are the most common KRAS mutations in NSCLC, comprising just about half of all KRAS mutations in this tumor type. Despite being the most common and first detected oncogene driver in lung cancer, until recently there were no targeted therapies in KRAS mutant NSCLC. The development of direct KRAS^G12C inhibitors represents an important step forward in targeting KRAS mutations. These inhibitors bind inactive guanosine diphosphate (GDP)–bound RAS and trap it in its inactive state.

Dr Jänne and colleagues recently published a phase 2 registrational trial of the direct KRAS^G12C inhibitor adagrasib. In this study of 112 patients with measurable disease at baseline treated with adagrasib, 48 (42.9%) had a confirmed objective response. The median duration of response was 8.5 months (95% CI 6.2-13.8), and the median progression-free survival (PFS) was 6.5 months (95% CI 4.7-8.4). The median overall survival (OS) was 12.6 months (95% CI 9.2-19.2). Among 33 patients with previously treated, stable central nervous system (CNS) metastases, the intracranial confirmed objective response rate was 33.3% (95% CI 18.0-51.8). Treatment-related adverse events occurred in 97.4% of the patients: grade 1 or 2 in 52.6% and grade 3 or higher in 44.8% (including two grade 5 events). The most frequent toxicities were fatigue and gastrointestinal-related issues (nausea, vomiting, diarrhea, aspartate transaminase/alanine transaminase elevation). Adagrasib was discontinued in 6.9% of patients.

These results further demonstrate that the KRAS^G12C mutation is an actionable target in NSCLC. Sotorasib, another direct KRAS^G12C inhibitor, is currently US Food and Drug Administration approved after initial systemic treatment. The clinical activity of sotorasib and adagrasib are comparable; for sotorasib the rates are an overall response rate (ORR) of 37.1% (95% CI 28.6-46.2), median PFS of 6.8 months (95% CI 5.1-8.2), and median OS of 12.5 months (95% CI 10.0 to nonestimable). Adagrasib also has published evidence of CNS activity that tracks with its systemic activity. Overall, these direct KRAS^G12C inhibitors represent a major advance in the treatment of KRAS^G12C-mutant NSCLC.

EGFR-Mutated NSCLC: Aumolertinib vs Gefitinib Extends PFS

Epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKI) have improved clinical outcomes in EGFR-mutant NSCLC.The current standard of care for first-line treatment of advanced NSCLC with the most frequent EGFR activating mutations (EGFR E19del and L858R)is the third-generation EGFR TKI osimertinib. In the FLAURA trial, patients randomly assigned tofirst-lineosimertinib had a substantial PFS benefit (median PFS 18.9 vs 10.2 months) and OS benefit (median OS 38.6 vs 31.8 months)when receivingosimertinib compared with gefitinib or erlotinib.

In the AENEAS trial, published in the Journal of Clinical Oncologyby Dr Lu and colleagues, 420 patients from China with advanced NSCLC harboring EGFR E19del or L858R activating mutations and naive to systemic treatment were enrolled. Patients were randomly assigned to the next-generation EGFR TKI aumolertinib or the first-generation EGFR TKI gefitinib with the primary endpoint of PFS by investigator assessment.Of note, patients with asymptomatic, untreated brain metastases were allowed into the trial. Upon disease progression, patients in the gefitinib group who acquired an EGFR T790M mutation were eligible to crossover to aumolertinib.

The study met its primary endpoint: Patients treated with aumolertinib compared with those treated with gefitinib had a significantly longer median PFS (19.3 vs 9.9 months; hazard ratio [HR] 0.46; P< .0001). This PFS advantage of aumolertinib over gefitinib was also present in the subgroup of patients with CNS metastases (15.3 vs 8.2 months; HR 0.38; P< .0001). The objective response rate was similar inthe aumolertinib and gefitinib groups (objective response rate 73.8% and 72.1%, respectively). The median duration of response was 18.1 months (95% CI 15.2 to not reached) with aumolertinib vs 8.3 months (95% CI 6.9-11.1) with gefitinib. Treatment-emergent adverse events of grade 3 or more were similar in the aumolertinib and gefitinib groups (36.4% vs 35.8%, respectively). There was less rash and diarrhea as well as transaminitis in the aumolertinib arm compared with the gefitinib arm. However, 35.5% of patients developed an elevation in creatinine phosphokinase (CPK), including 7% with grade 3 CPK elevation. However, no rhabdomyolysis was observed.

Overall, the AENEAS study showed comparable median PFS for first-line aumolertinib comparedwith what was observed with osimertinib in the FLAURA study. We still await the OSdata on aumolertinib compared with gefitinib. In the FLAURA study, investigators could choose between erlotinib or gefitinib in the control arm, whereas in AENEAS only gefitinib was allowed, which may have less CNS activity than erlotinib. Moreover, the FLAURA trial was conducted worldwide, whereas the AENEAS trial only enrolled patients in China. This study provides further support for the use of third-generation EGFR TKI over first-generation EGFR TKI as first-line treatment in advanced/metastatic NSCLC harboring EGFR E19del or L858R mutations.

Advanced ALK+ NSCLC With Brain Metastases: Lorlatinib Boosts PFS, Reduces CNS Progression

The CROWN trial was a pivotal randomized phase 3 trial that demonstrated an impressive improvement in PFS in patients treated with the third-generationALK inhibitor lorlatinib compared with the first-generation ALK inhibitor crizotinib as initial treatment for advanced ALK-postive (ALK+) NSCLC (HR for disease progression or death0.28; 95% CI0.19-0.41; P≤ .001). A major driver of this PFS benefit in ALK+ NSCLC in the CROWN study is the superior CNS penetration of lorlatinib compared with crizotinib. Obtaining CNS control in ALK+ lung cancers is important because up to 40% of patients with ALK+ NSCLC have brain metastases at initial evaluation, and CNS progression is often observed in patients with ALK+ lung cancer whether it be intracranial metastases or leptomeningeal carcinomatosis. A potential challenge in treating patients with lorlatinib is a unique side effect profile including neurocognitive side effects from lorlatinib. In a recently published study in the Journal of Clinical Oncology, Dr Solomon and colleagues conducted a post hoc exploratory analysis of intracranial efficacy and safety of lorlatinib in ALK+ NSCLC from a phase 3 trial. PFS by blinded independent central review was improved with lorlatinib vs crizotinib in patients with and without brain metastases at baseline (12-month PFS rates: 78% vs 22% and 78% vs 45%, respectively). Lorlatinib was associated with lower 12-month cumulative incidence of CNS progression compared with crizotinib in patients with (7.4% vs 72%) and without (1% vs 18%) brain metastases at baseline. Complete CNS responses with lorlatinib were seen in 23/38(61%) patients with any brain metastases at baseline compared with 6/40 (15%) with crizotinib. In total, 35% of patients had CNS adverse events with lorlatinib: grade 1 (21%), grade 2 (10%), and grade 3 (3%)in severity. These included cognitive (21%), mood (16%), speech (5%), and psychotic effects (3%), some of which overlapped. Half of all CNS adverse events resolved without intervention or with lorlatinib dose modification. Dose reductions of lorlatinib did not appear to affect PFS on the basis of a landmark analysis. Overall, this study demonstrates the exceptional CNS activity of lorlatinib in ALK+ NSCLC and that the neurocognitive side effects can often be managed. There are several next-generation ALK inhibitors now approved in the first-line setting —alectinib, lorlatinib, and brigatinib — notably all with enhanced CNS penetration and improved PFS compared with crizotinib. This posthoc study further supports the impressive CNS activity of lorlatinib in ALK+ NSCLC and supports the use of lorlatinib as a first-line treatment option in these patients, particularly those with ALK+ NSCLC diagnosed with baseline CNS disease.

The Direct KRAS^G12C Inhibitor Adagrasib in Advanced KRAS^G12C-Mutant NSCLC: Results From a Registrational Phase 2 Study

KRAS mutations are detected in about one quarter of all lung adenocarcinomas and are the most common oncogene driver in non–small-cell lung cancer (NSCLC). KRAS^G12C amino acid substitutions are the most common KRAS mutations in NSCLC, comprising just about half of all KRAS mutations in this tumor type. Despite being the most common and first detected oncogene driver in lung cancer, until recently there were no targeted therapies in KRAS mutant NSCLC. The development of direct KRAS^G12C inhibitors represents an important step forward in targeting KRAS mutations. These inhibitors bind inactive guanosine diphosphate (GDP)–bound RAS and trap it in its inactive state.

Dr Jänne and colleagues recently published a phase 2 registrational trial of the direct KRAS^G12C inhibitor adagrasib. In this study of 112 patients with measurable disease at baseline treated with adagrasib, 48 (42.9%) had a confirmed objective response. The median duration of response was 8.5 months (95% CI 6.2-13.8), and the median progression-free survival (PFS) was 6.5 months (95% CI 4.7-8.4). The median overall survival (OS) was 12.6 months (95% CI 9.2-19.2). Among 33 patients with previously treated, stable central nervous system (CNS) metastases, the intracranial confirmed objective response rate was 33.3% (95% CI 18.0-51.8). Treatment-related adverse events occurred in 97.4% of the patients: grade 1 or 2 in 52.6% and grade 3 or higher in 44.8% (including two grade 5 events). The most frequent toxicities were fatigue and gastrointestinal-related issues (nausea, vomiting, diarrhea, aspartate transaminase/alanine transaminase elevation). Adagrasib was discontinued in 6.9% of patients.

These results further demonstrate that the KRAS^G12C mutation is an actionable target in NSCLC. Sotorasib, another direct KRAS^G12C inhibitor, is currently US Food and Drug Administration approved after initial systemic treatment. The clinical activity of sotorasib and adagrasib are comparable; for sotorasib the rates are an overall response rate (ORR) of 37.1% (95% CI 28.6-46.2), median PFS of 6.8 months (95% CI 5.1-8.2), and median OS of 12.5 months (95% CI 10.0 to nonestimable). Adagrasib also has published evidence of CNS activity that tracks with its systemic activity. Overall, these direct KRAS^G12C inhibitors represent a major advance in the treatment of KRAS^G12C-mutant NSCLC.

EGFR-Mutated NSCLC: Aumolertinib vs Gefitinib Extends PFS

Epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKI) have improved clinical outcomes in EGFR-mutant NSCLC.The current standard of care for first-line treatment of advanced NSCLC with the most frequent EGFR activating mutations (EGFR E19del and L858R)is the third-generation EGFR TKI osimertinib. In the FLAURA trial, patients randomly assigned tofirst-lineosimertinib had a substantial PFS benefit (median PFS 18.9 vs 10.2 months) and OS benefit (median OS 38.6 vs 31.8 months)when receivingosimertinib compared with gefitinib or erlotinib.

In the AENEAS trial, published in the Journal of Clinical Oncologyby Dr Lu and colleagues, 420 patients from China with advanced NSCLC harboring EGFR E19del or L858R activating mutations and naive to systemic treatment were enrolled. Patients were randomly assigned to the next-generation EGFR TKI aumolertinib or the first-generation EGFR TKI gefitinib with the primary endpoint of PFS by investigator assessment.Of note, patients with asymptomatic, untreated brain metastases were allowed into the trial. Upon disease progression, patients in the gefitinib group who acquired an EGFR T790M mutation were eligible to crossover to aumolertinib.

The study met its primary endpoint: Patients treated with aumolertinib compared with those treated with gefitinib had a significantly longer median PFS (19.3 vs 9.9 months; hazard ratio [HR] 0.46; P< .0001). This PFS advantage of aumolertinib over gefitinib was also present in the subgroup of patients with CNS metastases (15.3 vs 8.2 months; HR 0.38; P< .0001). The objective response rate was similar inthe aumolertinib and gefitinib groups (objective response rate 73.8% and 72.1%, respectively). The median duration of response was 18.1 months (95% CI 15.2 to not reached) with aumolertinib vs 8.3 months (95% CI 6.9-11.1) with gefitinib. Treatment-emergent adverse events of grade 3 or more were similar in the aumolertinib and gefitinib groups (36.4% vs 35.8%, respectively). There was less rash and diarrhea as well as transaminitis in the aumolertinib arm compared with the gefitinib arm. However, 35.5% of patients developed an elevation in creatinine phosphokinase (CPK), including 7% with grade 3 CPK elevation. However, no rhabdomyolysis was observed.

Overall, the AENEAS study showed comparable median PFS for first-line aumolertinib comparedwith what was observed with osimertinib in the FLAURA study. We still await the OSdata on aumolertinib compared with gefitinib. In the FLAURA study, investigators could choose between erlotinib or gefitinib in the control arm, whereas in AENEAS only gefitinib was allowed, which may have less CNS activity than erlotinib. Moreover, the FLAURA trial was conducted worldwide, whereas the AENEAS trial only enrolled patients in China. This study provides further support for the use of third-generation EGFR TKI over first-generation EGFR TKI as first-line treatment in advanced/metastatic NSCLC harboring EGFR E19del or L858R mutations.

Advanced ALK+ NSCLC With Brain Metastases: Lorlatinib Boosts PFS, Reduces CNS Progression

The CROWN trial was a pivotal randomized phase 3 trial that demonstrated an impressive improvement in PFS in patients treated with the third-generationALK inhibitor lorlatinib compared with the first-generation ALK inhibitor crizotinib as initial treatment for advanced ALK-postive (ALK+) NSCLC (HR for disease progression or death0.28; 95% CI0.19-0.41; P≤ .001). A major driver of this PFS benefit in ALK+ NSCLC in the CROWN study is the superior CNS penetration of lorlatinib compared with crizotinib. Obtaining CNS control in ALK+ lung cancers is important because up to 40% of patients with ALK+ NSCLC have brain metastases at initial evaluation, and CNS progression is often observed in patients with ALK+ lung cancer whether it be intracranial metastases or leptomeningeal carcinomatosis. A potential challenge in treating patients with lorlatinib is a unique side effect profile including neurocognitive side effects from lorlatinib. In a recently published study in the Journal of Clinical Oncology, Dr Solomon and colleagues conducted a post hoc exploratory analysis of intracranial efficacy and safety of lorlatinib in ALK+ NSCLC from a phase 3 trial. PFS by blinded independent central review was improved with lorlatinib vs crizotinib in patients with and without brain metastases at baseline (12-month PFS rates: 78% vs 22% and 78% vs 45%, respectively). Lorlatinib was associated with lower 12-month cumulative incidence of CNS progression compared with crizotinib in patients with (7.4% vs 72%) and without (1% vs 18%) brain metastases at baseline. Complete CNS responses with lorlatinib were seen in 23/38(61%) patients with any brain metastases at baseline compared with 6/40 (15%) with crizotinib. In total, 35% of patients had CNS adverse events with lorlatinib: grade 1 (21%), grade 2 (10%), and grade 3 (3%)in severity. These included cognitive (21%), mood (16%), speech (5%), and psychotic effects (3%), some of which overlapped. Half of all CNS adverse events resolved without intervention or with lorlatinib dose modification. Dose reductions of lorlatinib did not appear to affect PFS on the basis of a landmark analysis. Overall, this study demonstrates the exceptional CNS activity of lorlatinib in ALK+ NSCLC and that the neurocognitive side effects can often be managed. There are several next-generation ALK inhibitors now approved in the first-line setting —alectinib, lorlatinib, and brigatinib — notably all with enhanced CNS penetration and improved PFS compared with crizotinib. This posthoc study further supports the impressive CNS activity of lorlatinib in ALK+ NSCLC and supports the use of lorlatinib as a first-line treatment option in these patients, particularly those with ALK+ NSCLC diagnosed with baseline CNS disease.

The Direct KRAS^G12C Inhibitor Adagrasib in Advanced KRAS^G12C-Mutant NSCLC: Results From a Registrational Phase 2 Study

KRAS mutations are detected in about one quarter of all lung adenocarcinomas and are the most common oncogene driver in non–small-cell lung cancer (NSCLC). KRAS^G12C amino acid substitutions are the most common KRAS mutations in NSCLC, comprising just about half of all KRAS mutations in this tumor type. Despite being the most common and first detected oncogene driver in lung cancer, until recently there were no targeted therapies in KRAS mutant NSCLC. The development of direct KRAS^G12C inhibitors represents an important step forward in targeting KRAS mutations. These inhibitors bind inactive guanosine diphosphate (GDP)–bound RAS and trap it in its inactive state.

Dr Jänne and colleagues recently published a phase 2 registrational trial of the direct KRAS^G12C inhibitor adagrasib. In this study of 112 patients with measurable disease at baseline treated with adagrasib, 48 (42.9%) had a confirmed objective response. The median duration of response was 8.5 months (95% CI 6.2-13.8), and the median progression-free survival (PFS) was 6.5 months (95% CI 4.7-8.4). The median overall survival (OS) was 12.6 months (95% CI 9.2-19.2). Among 33 patients with previously treated, stable central nervous system (CNS) metastases, the intracranial confirmed objective response rate was 33.3% (95% CI 18.0-51.8). Treatment-related adverse events occurred in 97.4% of the patients: grade 1 or 2 in 52.6% and grade 3 or higher in 44.8% (including two grade 5 events). The most frequent toxicities were fatigue and gastrointestinal-related issues (nausea, vomiting, diarrhea, aspartate transaminase/alanine transaminase elevation). Adagrasib was discontinued in 6.9% of patients.

These results further demonstrate that the KRAS^G12C mutation is an actionable target in NSCLC. Sotorasib, another direct KRAS^G12C inhibitor, is currently US Food and Drug Administration approved after initial systemic treatment. The clinical activity of sotorasib and adagrasib are comparable; for sotorasib the rates are an overall response rate (ORR) of 37.1% (95% CI 28.6-46.2), median PFS of 6.8 months (95% CI 5.1-8.2), and median OS of 12.5 months (95% CI 10.0 to nonestimable). Adagrasib also has published evidence of CNS activity that tracks with its systemic activity. Overall, these direct KRAS^G12C inhibitors represent a major advance in the treatment of KRAS^G12C-mutant NSCLC.

EGFR-Mutated NSCLC: Aumolertinib vs Gefitinib Extends PFS

Epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKI) have improved clinical outcomes in EGFR-mutant NSCLC.The current standard of care for first-line treatment of advanced NSCLC with the most frequent EGFR activating mutations (EGFR E19del and L858R)is the third-generation EGFR TKI osimertinib. In the FLAURA trial, patients randomly assigned tofirst-lineosimertinib had a substantial PFS benefit (median PFS 18.9 vs 10.2 months) and OS benefit (median OS 38.6 vs 31.8 months)when receivingosimertinib compared with gefitinib or erlotinib.

In the AENEAS trial, published in the Journal of Clinical Oncologyby Dr Lu and colleagues, 420 patients from China with advanced NSCLC harboring EGFR E19del or L858R activating mutations and naive to systemic treatment were enrolled. Patients were randomly assigned to the next-generation EGFR TKI aumolertinib or the first-generation EGFR TKI gefitinib with the primary endpoint of PFS by investigator assessment.Of note, patients with asymptomatic, untreated brain metastases were allowed into the trial. Upon disease progression, patients in the gefitinib group who acquired an EGFR T790M mutation were eligible to crossover to aumolertinib.

The study met its primary endpoint: Patients treated with aumolertinib compared with those treated with gefitinib had a significantly longer median PFS (19.3 vs 9.9 months; hazard ratio [HR] 0.46; P< .0001). This PFS advantage of aumolertinib over gefitinib was also present in the subgroup of patients with CNS metastases (15.3 vs 8.2 months; HR 0.38; P< .0001). The objective response rate was similar inthe aumolertinib and gefitinib groups (objective response rate 73.8% and 72.1%, respectively). The median duration of response was 18.1 months (95% CI 15.2 to not reached) with aumolertinib vs 8.3 months (95% CI 6.9-11.1) with gefitinib. Treatment-emergent adverse events of grade 3 or more were similar in the aumolertinib and gefitinib groups (36.4% vs 35.8%, respectively). There was less rash and diarrhea as well as transaminitis in the aumolertinib arm compared with the gefitinib arm. However, 35.5% of patients developed an elevation in creatinine phosphokinase (CPK), including 7% with grade 3 CPK elevation. However, no rhabdomyolysis was observed.

Overall, the AENEAS study showed comparable median PFS for first-line aumolertinib comparedwith what was observed with osimertinib in the FLAURA study. We still await the OSdata on aumolertinib compared with gefitinib. In the FLAURA study, investigators could choose between erlotinib or gefitinib in the control arm, whereas in AENEAS only gefitinib was allowed, which may have less CNS activity than erlotinib. Moreover, the FLAURA trial was conducted worldwide, whereas the AENEAS trial only enrolled patients in China. This study provides further support for the use of third-generation EGFR TKI over first-generation EGFR TKI as first-line treatment in advanced/metastatic NSCLC harboring EGFR E19del or L858R mutations.

Advanced ALK+ NSCLC With Brain Metastases: Lorlatinib Boosts PFS, Reduces CNS Progression

The CROWN trial was a pivotal randomized phase 3 trial that demonstrated an impressive improvement in PFS in patients treated with the third-generationALK inhibitor lorlatinib compared with the first-generation ALK inhibitor crizotinib as initial treatment for advanced ALK-postive (ALK+) NSCLC (HR for disease progression or death0.28; 95% CI0.19-0.41; P≤ .001). A major driver of this PFS benefit in ALK+ NSCLC in the CROWN study is the superior CNS penetration of lorlatinib compared with crizotinib. Obtaining CNS control in ALK+ lung cancers is important because up to 40% of patients with ALK+ NSCLC have brain metastases at initial evaluation, and CNS progression is often observed in patients with ALK+ lung cancer whether it be intracranial metastases or leptomeningeal carcinomatosis. A potential challenge in treating patients with lorlatinib is a unique side effect profile including neurocognitive side effects from lorlatinib. In a recently published study in the Journal of Clinical Oncology, Dr Solomon and colleagues conducted a post hoc exploratory analysis of intracranial efficacy and safety of lorlatinib in ALK+ NSCLC from a phase 3 trial. PFS by blinded independent central review was improved with lorlatinib vs crizotinib in patients with and without brain metastases at baseline (12-month PFS rates: 78% vs 22% and 78% vs 45%, respectively). Lorlatinib was associated with lower 12-month cumulative incidence of CNS progression compared with crizotinib in patients with (7.4% vs 72%) and without (1% vs 18%) brain metastases at baseline. Complete CNS responses with lorlatinib were seen in 23/38(61%) patients with any brain metastases at baseline compared with 6/40 (15%) with crizotinib. In total, 35% of patients had CNS adverse events with lorlatinib: grade 1 (21%), grade 2 (10%), and grade 3 (3%)in severity. These included cognitive (21%), mood (16%), speech (5%), and psychotic effects (3%), some of which overlapped. Half of all CNS adverse events resolved without intervention or with lorlatinib dose modification. Dose reductions of lorlatinib did not appear to affect PFS on the basis of a landmark analysis. Overall, this study demonstrates the exceptional CNS activity of lorlatinib in ALK+ NSCLC and that the neurocognitive side effects can often be managed. There are several next-generation ALK inhibitors now approved in the first-line setting —alectinib, lorlatinib, and brigatinib — notably all with enhanced CNS penetration and improved PFS compared with crizotinib. This posthoc study further supports the impressive CNS activity of lorlatinib in ALK+ NSCLC and supports the use of lorlatinib as a first-line treatment option in these patients, particularly those with ALK+ NSCLC diagnosed with baseline CNS disease.

Real-World Retrospective Study Suggests Inferior Outcomes to First-Line Systemic Treatment in Advanced NFE2L2 and KEAP1 Mutant Squamous NSCLC

Targeted therapies against oncogene-driven lung cancer, such as epidermal growth factor receptor (EGFR) and anaplastic lymphoma kinase (ALK), in lung adenocarcinoma have revolutionized lung cancer treatment. However, there are no US Food and Drug Administration–approved targeted therapies for commonly occurring mutations in advanced squamous non–small cell lung cancer (NSCLC).

NFE2L2 and KEAP1 mutations are molecular alterations that occur in about 25%-30% of squamous NSCLC. NFE2L2 encodes for the NRF2 transcription factor that is involved in the oxidative stress pathway and KEAP1 encodes for the KEAP1 protein, which is the negative regulator of NFE2L2.¹ When the NRF2-KEAP1 signaling pathway is disrupted, there is persistent activation of NRF2, which promotes cell proliferation and carcinogenesis and may contribute to resistance to cancer-directed treatments. Previous retrospective studies suggest that patients with lung cancers harboring NFE2L2 and KEAP1 mutations have a poorer prognosis and do worse with both systemic anticancer treatments and radiation.^2-5

Wu and colleagues, in a retrospective cohort study, identified 703 patients with squamous NSCLC from 2011 to 2018 who had NFE2L2 or KEAP1 mutations identified by comprehensive genomic profiling in the Flatiron Health-Foundation Medicine Clinico-Genomic Database. Real-world progression-free survival (PFS), defined as a distinct episode where the clinician concluded that there was growth or worsening of disease, was assessed by line and type of treatment, as was overall survival (OS). Patients with squamous NSCLC with NFE2L2/KEAP1 mutations had shorter real-world PFS to first-line treatment compared with patients whose tumors were wild-type for these mutations (4.54 months vs 6.25 months; P = .0027). Median OS was numerically shorter in patients with NFE2L2/KEAP1 mutations, but this was not statistically significant (13.59 vs 17.37 months; P = .41). This retrospective real-world analysis suggests that patients with squamous NSCLC and NFE2L2/KEAP1 mutations have inferior outcomes with systemic treatments and may have worsened OS; however, this was not statistically significant. Many of these patients were treated before the approval of the KEYNOTE-407 chemo-immunotherapy regimen in squamous NSCLC, so they did not have what we would consider contemporary standard treatment. Further studies are needed to evaluate the role of NRF2 activation in resistance to NSCLC treatments, and there is a need for therapeutics to target these common mutations in squamous NSCLC. Fortunately, there are current ongoing clinical trials.^[6]

Segmentectomy Is Noninferior to and Improves Overall Survival Compared With Lobectomy in Selected Cases of Small Peripheral Early-Stage NSCLC              

Lobectomy has been the standard of care for surgical treatment of early-stage NSCLC. Saji and colleagues investigated whether segmentectomy was noninferior to lobectomy in selected cases of small-sized peripheral NSCLC. This randomized, controlled, noninferiority trial was conducted at 70 institutions in Japan.

Patients with selected stage IA (American Joint Committee on Cancer [AJCC], seventh edition) NSCLC (peripheral tumors, £ 2 cm diameter, consolidation-to-tumor ratio > 0.5) were randomly assigned to undergo segmentectomy or lobectomy. The primary endpoint was OS. Pertinent secondary endpoints included postoperative respiratory function, relapse-free survival, and adverse events.

A total of 1106 patients were enrolled: 554 in the lobectomy group and 552 in the segmentectomy group. The 5-year OS was 94.3% for segmentectomy and 91.1% for lobectomy (hazard ratio 0.663; one-sided P < .001 for noninferiority; P = .0082 for superiority). In addition to the modestly improved OS observed, 5-year relapse-free survival was comparable between the groups (88% for segmentectomy and 87.9% for lobectomy). However, more local relapse was observed for segmentectomy (10.5%) than for lobectomy (5.4%) (P = .0018). Despite significantly more locoregional recurrences with segmentectomy compared with lobectomy, rates of combined distant and locoregional relapses were similar. Slightly more patients died in the lobectomy group than the segmentectomy group, and the rate of cancer-related deaths, including second primary lung cancers, was higher in the lobectomy group. Interestingly, although segmentectomy had better OS, the survival advantage was not cancer-specific.

The mechanism by which segmentectomy improved survival over lobectomy in these selected patients with small, peripheral stage IA NSCLC is still unclear. Limitations of the study included that all patients were from one geographic region (Japan) and that the study was unblinded, which can introduce bias. We await the results of CALGB 140503: A Randomized Phase III Trial of Lobectomy versus Sublobar Resection for Small (< 2cm) Peripheral Non-Small Cell Lung Cancer (NCT00499330). This study is being done in a US population and includes nonanatomic wedge in its sublobar resection cohort.

The study by Saji and colleagues suggests that surgeons should consider segmentectomy in appropriate patients (select small stage IA NSCLC [peripheral tumors, £ 2 cm diameter, consolidation-to-tumor ratio > 0.5]), based on the modest improvement in OS compared with lobectomy.

Immunotherapy Activity in Cachexic and Noncachexic Patients With Advanced NSCLC and Clinical Outcomes, by Adipose Tissue Loss on Treatment

There are emerging data that body mass index (BMI) and the presence or absence of cachexia in cancers, including NSCLC, may change the efficacy of programmed cell death-ligand 1 (PD-L1) immune checkpoint inhibitors. Nishioka and colleagues, in a single-center retrospective cohort, examined patients with advanced NSCLC (40 with cachexia and 34 without cachexia) who received PD-L1 inhibitors (pembrolizumab, nivolumab, or atezolizumab). Patients were excluded if they had poor performance status, EGFR/ALK/ROS1 oncogene drivers, unknown PD-L1 expression status, and unknown weight loss in the 6 months before immunotherapy administration. In addition to BMI, measurements of adipose tissue quantity and muscle mass were used.

The overall response rate was 28.4% in the 74 patients analyzed. Patients with cachexia had a lower overall response rate than those without cachexia (15.0% vs 44.1%; P < .05). Among the patients without cachexia, those with total adipose tissue loss had a significantly longer PFS than those with total adipose tissue maintenance (18.5 months vs 2.86 months; P = .037), including in a multivariate analyses (hazard ratio 0.34; P < .05), after adjustment for PD-L1 expression and performance status (Eastern Cooperative Oncology Group [ECOG] 0 vs. 1).

Mechanistically, a paradoxical effect of obesity on T-cell function that relates to leptin, which is secreted by adipose tissue, has been observed in preclinical studies.⁷ In a previously published study, obesity resulted in tumor progression and PD-1–mediated T-cell dysfunction, which can be overcome by PD-L1 blockade with improved clinical outcomes to these therapies in patients with obesity and cancer, including NSCLC.⁷ This "obesity paradox" may underlie some of the findings observed in Nishioka and colleagues' study. More research needs to be done regarding the activity of immune checkpoint inhibition in NSCLC as it relates to BMI, cachexia, and amount of adipose tissue.

Additional References

1.           Shibata T, Ohta T, Tong KI, et al. Cancer related mutations in NRF2 impair its recognition by Keap1-Cul3 E3 ligase and promote malignancy. Proc Natl Acad Sci U S A. 2008;105(36):13568-13573. doi: 10.1073/pnas.0806268105

2.           Frank R, Scheffler M, Merkelbach-Bruse S, et al. Clinical and pathological characteristics of KEAP1- and NFE2L2-mutated non-small cell lung carcinoma (NSCLC). Clin Cancer Res. 2018;24:3087-3096. doi: 10.1158/1078-0432.CCR-17-3416

3.           Binkley MS, Jeon YJ, Nesselbush M, et al. KEAP1/NFE2L2 mutations predict lung cancer radiation resistance that can be targeted by glutaminase inhibition. Cancer Discov. 2020;10(12):1826-1841. doi: 10.1158/2159-8290.CD-20-0282

4.           Hellyer JA, Padda SK, Diehn M, et al. Clinical implications of KEAP1-NFE2L2 mutations in NSCLC. J Thorac Oncol. 2021;16(3):395-403. doi: 10.1016/j.jtho.2020.11.015

5.           Jeong Y, Hellyer JA, Stehr H, et al. Role of KEAP1/NFE2L2 mutations in the chemotherapeutic response of patients with non-small cell lung cancer. Clin Cancer Res. 2020;26(1):274-281. doi: 10.1158/1078-0432.CCR-19-1237

6.           Riess JW, Frankel P, Shackelford D, et al. Phase 1 trial of MLN0128 (sapanisertib) and CB-839 HCl (telaglenastat) in patients with advanced NSCLC (NCI 10327): Rationale and study design. Clin Lung Cancer. 2021;22:67-70. doi: 10.1016/j.cllc.2020.10.006

Real-World Retrospective Study Suggests Inferior Outcomes to First-Line Systemic Treatment in Advanced NFE2L2 and KEAP1 Mutant Squamous NSCLC

Targeted therapies against oncogene-driven lung cancer, such as epidermal growth factor receptor (EGFR) and anaplastic lymphoma kinase (ALK), in lung adenocarcinoma have revolutionized lung cancer treatment. However, there are no US Food and Drug Administration–approved targeted therapies for commonly occurring mutations in advanced squamous non–small cell lung cancer (NSCLC).

NFE2L2 and KEAP1 mutations are molecular alterations that occur in about 25%-30% of squamous NSCLC. NFE2L2 encodes for the NRF2 transcription factor that is involved in the oxidative stress pathway and KEAP1 encodes for the KEAP1 protein, which is the negative regulator of NFE2L2.¹ When the NRF2-KEAP1 signaling pathway is disrupted, there is persistent activation of NRF2, which promotes cell proliferation and carcinogenesis and may contribute to resistance to cancer-directed treatments. Previous retrospective studies suggest that patients with lung cancers harboring NFE2L2 and KEAP1 mutations have a poorer prognosis and do worse with both systemic anticancer treatments and radiation.^2-5

Wu and colleagues, in a retrospective cohort study, identified 703 patients with squamous NSCLC from 2011 to 2018 who had NFE2L2 or KEAP1 mutations identified by comprehensive genomic profiling in the Flatiron Health-Foundation Medicine Clinico-Genomic Database. Real-world progression-free survival (PFS), defined as a distinct episode where the clinician concluded that there was growth or worsening of disease, was assessed by line and type of treatment, as was overall survival (OS). Patients with squamous NSCLC with NFE2L2/KEAP1 mutations had shorter real-world PFS to first-line treatment compared with patients whose tumors were wild-type for these mutations (4.54 months vs 6.25 months; P = .0027). Median OS was numerically shorter in patients with NFE2L2/KEAP1 mutations, but this was not statistically significant (13.59 vs 17.37 months; P = .41). This retrospective real-world analysis suggests that patients with squamous NSCLC and NFE2L2/KEAP1 mutations have inferior outcomes with systemic treatments and may have worsened OS; however, this was not statistically significant. Many of these patients were treated before the approval of the KEYNOTE-407 chemo-immunotherapy regimen in squamous NSCLC, so they did not have what we would consider contemporary standard treatment. Further studies are needed to evaluate the role of NRF2 activation in resistance to NSCLC treatments, and there is a need for therapeutics to target these common mutations in squamous NSCLC. Fortunately, there are current ongoing clinical trials.^[6]

Segmentectomy Is Noninferior to and Improves Overall Survival Compared With Lobectomy in Selected Cases of Small Peripheral Early-Stage NSCLC              

Lobectomy has been the standard of care for surgical treatment of early-stage NSCLC. Saji and colleagues investigated whether segmentectomy was noninferior to lobectomy in selected cases of small-sized peripheral NSCLC. This randomized, controlled, noninferiority trial was conducted at 70 institutions in Japan.

Patients with selected stage IA (American Joint Committee on Cancer [AJCC], seventh edition) NSCLC (peripheral tumors, £ 2 cm diameter, consolidation-to-tumor ratio > 0.5) were randomly assigned to undergo segmentectomy or lobectomy. The primary endpoint was OS. Pertinent secondary endpoints included postoperative respiratory function, relapse-free survival, and adverse events.

A total of 1106 patients were enrolled: 554 in the lobectomy group and 552 in the segmentectomy group. The 5-year OS was 94.3% for segmentectomy and 91.1% for lobectomy (hazard ratio 0.663; one-sided P < .001 for noninferiority; P = .0082 for superiority). In addition to the modestly improved OS observed, 5-year relapse-free survival was comparable between the groups (88% for segmentectomy and 87.9% for lobectomy). However, more local relapse was observed for segmentectomy (10.5%) than for lobectomy (5.4%) (P = .0018). Despite significantly more locoregional recurrences with segmentectomy compared with lobectomy, rates of combined distant and locoregional relapses were similar. Slightly more patients died in the lobectomy group than the segmentectomy group, and the rate of cancer-related deaths, including second primary lung cancers, was higher in the lobectomy group. Interestingly, although segmentectomy had better OS, the survival advantage was not cancer-specific.

The mechanism by which segmentectomy improved survival over lobectomy in these selected patients with small, peripheral stage IA NSCLC is still unclear. Limitations of the study included that all patients were from one geographic region (Japan) and that the study was unblinded, which can introduce bias. We await the results of CALGB 140503: A Randomized Phase III Trial of Lobectomy versus Sublobar Resection for Small (< 2cm) Peripheral Non-Small Cell Lung Cancer (NCT00499330). This study is being done in a US population and includes nonanatomic wedge in its sublobar resection cohort.

The study by Saji and colleagues suggests that surgeons should consider segmentectomy in appropriate patients (select small stage IA NSCLC [peripheral tumors, £ 2 cm diameter, consolidation-to-tumor ratio > 0.5]), based on the modest improvement in OS compared with lobectomy.

Immunotherapy Activity in Cachexic and Noncachexic Patients With Advanced NSCLC and Clinical Outcomes, by Adipose Tissue Loss on Treatment

There are emerging data that body mass index (BMI) and the presence or absence of cachexia in cancers, including NSCLC, may change the efficacy of programmed cell death-ligand 1 (PD-L1) immune checkpoint inhibitors. Nishioka and colleagues, in a single-center retrospective cohort, examined patients with advanced NSCLC (40 with cachexia and 34 without cachexia) who received PD-L1 inhibitors (pembrolizumab, nivolumab, or atezolizumab). Patients were excluded if they had poor performance status, EGFR/ALK/ROS1 oncogene drivers, unknown PD-L1 expression status, and unknown weight loss in the 6 months before immunotherapy administration. In addition to BMI, measurements of adipose tissue quantity and muscle mass were used.

The overall response rate was 28.4% in the 74 patients analyzed. Patients with cachexia had a lower overall response rate than those without cachexia (15.0% vs 44.1%; P < .05). Among the patients without cachexia, those with total adipose tissue loss had a significantly longer PFS than those with total adipose tissue maintenance (18.5 months vs 2.86 months; P = .037), including in a multivariate analyses (hazard ratio 0.34; P < .05), after adjustment for PD-L1 expression and performance status (Eastern Cooperative Oncology Group [ECOG] 0 vs. 1).

Mechanistically, a paradoxical effect of obesity on T-cell function that relates to leptin, which is secreted by adipose tissue, has been observed in preclinical studies.⁷ In a previously published study, obesity resulted in tumor progression and PD-1–mediated T-cell dysfunction, which can be overcome by PD-L1 blockade with improved clinical outcomes to these therapies in patients with obesity and cancer, including NSCLC.⁷ This "obesity paradox" may underlie some of the findings observed in Nishioka and colleagues' study. More research needs to be done regarding the activity of immune checkpoint inhibition in NSCLC as it relates to BMI, cachexia, and amount of adipose tissue.

Additional References

1.           Shibata T, Ohta T, Tong KI, et al. Cancer related mutations in NRF2 impair its recognition by Keap1-Cul3 E3 ligase and promote malignancy. Proc Natl Acad Sci U S A. 2008;105(36):13568-13573. doi: 10.1073/pnas.0806268105

2.           Frank R, Scheffler M, Merkelbach-Bruse S, et al. Clinical and pathological characteristics of KEAP1- and NFE2L2-mutated non-small cell lung carcinoma (NSCLC). Clin Cancer Res. 2018;24:3087-3096. doi: 10.1158/1078-0432.CCR-17-3416

3.           Binkley MS, Jeon YJ, Nesselbush M, et al. KEAP1/NFE2L2 mutations predict lung cancer radiation resistance that can be targeted by glutaminase inhibition. Cancer Discov. 2020;10(12):1826-1841. doi: 10.1158/2159-8290.CD-20-0282

4.           Hellyer JA, Padda SK, Diehn M, et al. Clinical implications of KEAP1-NFE2L2 mutations in NSCLC. J Thorac Oncol. 2021;16(3):395-403. doi: 10.1016/j.jtho.2020.11.015

5.           Jeong Y, Hellyer JA, Stehr H, et al. Role of KEAP1/NFE2L2 mutations in the chemotherapeutic response of patients with non-small cell lung cancer. Clin Cancer Res. 2020;26(1):274-281. doi: 10.1158/1078-0432.CCR-19-1237

6.           Riess JW, Frankel P, Shackelford D, et al. Phase 1 trial of MLN0128 (sapanisertib) and CB-839 HCl (telaglenastat) in patients with advanced NSCLC (NCI 10327): Rationale and study design. Clin Lung Cancer. 2021;22:67-70. doi: 10.1016/j.cllc.2020.10.006

Real-World Retrospective Study Suggests Inferior Outcomes to First-Line Systemic Treatment in Advanced NFE2L2 and KEAP1 Mutant Squamous NSCLC

Targeted therapies against oncogene-driven lung cancer, such as epidermal growth factor receptor (EGFR) and anaplastic lymphoma kinase (ALK), in lung adenocarcinoma have revolutionized lung cancer treatment. However, there are no US Food and Drug Administration–approved targeted therapies for commonly occurring mutations in advanced squamous non–small cell lung cancer (NSCLC).

NFE2L2 and KEAP1 mutations are molecular alterations that occur in about 25%-30% of squamous NSCLC. NFE2L2 encodes for the NRF2 transcription factor that is involved in the oxidative stress pathway and KEAP1 encodes for the KEAP1 protein, which is the negative regulator of NFE2L2.¹ When the NRF2-KEAP1 signaling pathway is disrupted, there is persistent activation of NRF2, which promotes cell proliferation and carcinogenesis and may contribute to resistance to cancer-directed treatments. Previous retrospective studies suggest that patients with lung cancers harboring NFE2L2 and KEAP1 mutations have a poorer prognosis and do worse with both systemic anticancer treatments and radiation.^2-5

Wu and colleagues, in a retrospective cohort study, identified 703 patients with squamous NSCLC from 2011 to 2018 who had NFE2L2 or KEAP1 mutations identified by comprehensive genomic profiling in the Flatiron Health-Foundation Medicine Clinico-Genomic Database. Real-world progression-free survival (PFS), defined as a distinct episode where the clinician concluded that there was growth or worsening of disease, was assessed by line and type of treatment, as was overall survival (OS). Patients with squamous NSCLC with NFE2L2/KEAP1 mutations had shorter real-world PFS to first-line treatment compared with patients whose tumors were wild-type for these mutations (4.54 months vs 6.25 months; P = .0027). Median OS was numerically shorter in patients with NFE2L2/KEAP1 mutations, but this was not statistically significant (13.59 vs 17.37 months; P = .41). This retrospective real-world analysis suggests that patients with squamous NSCLC and NFE2L2/KEAP1 mutations have inferior outcomes with systemic treatments and may have worsened OS; however, this was not statistically significant. Many of these patients were treated before the approval of the KEYNOTE-407 chemo-immunotherapy regimen in squamous NSCLC, so they did not have what we would consider contemporary standard treatment. Further studies are needed to evaluate the role of NRF2 activation in resistance to NSCLC treatments, and there is a need for therapeutics to target these common mutations in squamous NSCLC. Fortunately, there are current ongoing clinical trials.^[6]

Segmentectomy Is Noninferior to and Improves Overall Survival Compared With Lobectomy in Selected Cases of Small Peripheral Early-Stage NSCLC              

Lobectomy has been the standard of care for surgical treatment of early-stage NSCLC. Saji and colleagues investigated whether segmentectomy was noninferior to lobectomy in selected cases of small-sized peripheral NSCLC. This randomized, controlled, noninferiority trial was conducted at 70 institutions in Japan.

Patients with selected stage IA (American Joint Committee on Cancer [AJCC], seventh edition) NSCLC (peripheral tumors, £ 2 cm diameter, consolidation-to-tumor ratio > 0.5) were randomly assigned to undergo segmentectomy or lobectomy. The primary endpoint was OS. Pertinent secondary endpoints included postoperative respiratory function, relapse-free survival, and adverse events.

A total of 1106 patients were enrolled: 554 in the lobectomy group and 552 in the segmentectomy group. The 5-year OS was 94.3% for segmentectomy and 91.1% for lobectomy (hazard ratio 0.663; one-sided P < .001 for noninferiority; P = .0082 for superiority). In addition to the modestly improved OS observed, 5-year relapse-free survival was comparable between the groups (88% for segmentectomy and 87.9% for lobectomy). However, more local relapse was observed for segmentectomy (10.5%) than for lobectomy (5.4%) (P = .0018). Despite significantly more locoregional recurrences with segmentectomy compared with lobectomy, rates of combined distant and locoregional relapses were similar. Slightly more patients died in the lobectomy group than the segmentectomy group, and the rate of cancer-related deaths, including second primary lung cancers, was higher in the lobectomy group. Interestingly, although segmentectomy had better OS, the survival advantage was not cancer-specific.

The mechanism by which segmentectomy improved survival over lobectomy in these selected patients with small, peripheral stage IA NSCLC is still unclear. Limitations of the study included that all patients were from one geographic region (Japan) and that the study was unblinded, which can introduce bias. We await the results of CALGB 140503: A Randomized Phase III Trial of Lobectomy versus Sublobar Resection for Small (< 2cm) Peripheral Non-Small Cell Lung Cancer (NCT00499330). This study is being done in a US population and includes nonanatomic wedge in its sublobar resection cohort.

The study by Saji and colleagues suggests that surgeons should consider segmentectomy in appropriate patients (select small stage IA NSCLC [peripheral tumors, £ 2 cm diameter, consolidation-to-tumor ratio > 0.5]), based on the modest improvement in OS compared with lobectomy.

Immunotherapy Activity in Cachexic and Noncachexic Patients With Advanced NSCLC and Clinical Outcomes, by Adipose Tissue Loss on Treatment

There are emerging data that body mass index (BMI) and the presence or absence of cachexia in cancers, including NSCLC, may change the efficacy of programmed cell death-ligand 1 (PD-L1) immune checkpoint inhibitors. Nishioka and colleagues, in a single-center retrospective cohort, examined patients with advanced NSCLC (40 with cachexia and 34 without cachexia) who received PD-L1 inhibitors (pembrolizumab, nivolumab, or atezolizumab). Patients were excluded if they had poor performance status, EGFR/ALK/ROS1 oncogene drivers, unknown PD-L1 expression status, and unknown weight loss in the 6 months before immunotherapy administration. In addition to BMI, measurements of adipose tissue quantity and muscle mass were used.

The overall response rate was 28.4% in the 74 patients analyzed. Patients with cachexia had a lower overall response rate than those without cachexia (15.0% vs 44.1%; P < .05). Among the patients without cachexia, those with total adipose tissue loss had a significantly longer PFS than those with total adipose tissue maintenance (18.5 months vs 2.86 months; P = .037), including in a multivariate analyses (hazard ratio 0.34; P < .05), after adjustment for PD-L1 expression and performance status (Eastern Cooperative Oncology Group [ECOG] 0 vs. 1).

Mechanistically, a paradoxical effect of obesity on T-cell function that relates to leptin, which is secreted by adipose tissue, has been observed in preclinical studies.⁷ In a previously published study, obesity resulted in tumor progression and PD-1–mediated T-cell dysfunction, which can be overcome by PD-L1 blockade with improved clinical outcomes to these therapies in patients with obesity and cancer, including NSCLC.⁷ This "obesity paradox" may underlie some of the findings observed in Nishioka and colleagues' study. More research needs to be done regarding the activity of immune checkpoint inhibition in NSCLC as it relates to BMI, cachexia, and amount of adipose tissue.

Additional References

1.           Shibata T, Ohta T, Tong KI, et al. Cancer related mutations in NRF2 impair its recognition by Keap1-Cul3 E3 ligase and promote malignancy. Proc Natl Acad Sci U S A. 2008;105(36):13568-13573. doi: 10.1073/pnas.0806268105

2.           Frank R, Scheffler M, Merkelbach-Bruse S, et al. Clinical and pathological characteristics of KEAP1- and NFE2L2-mutated non-small cell lung carcinoma (NSCLC). Clin Cancer Res. 2018;24:3087-3096. doi: 10.1158/1078-0432.CCR-17-3416

3.           Binkley MS, Jeon YJ, Nesselbush M, et al. KEAP1/NFE2L2 mutations predict lung cancer radiation resistance that can be targeted by glutaminase inhibition. Cancer Discov. 2020;10(12):1826-1841. doi: 10.1158/2159-8290.CD-20-0282

4.           Hellyer JA, Padda SK, Diehn M, et al. Clinical implications of KEAP1-NFE2L2 mutations in NSCLC. J Thorac Oncol. 2021;16(3):395-403. doi: 10.1016/j.jtho.2020.11.015

5.           Jeong Y, Hellyer JA, Stehr H, et al. Role of KEAP1/NFE2L2 mutations in the chemotherapeutic response of patients with non-small cell lung cancer. Clin Cancer Res. 2020;26(1):274-281. doi: 10.1158/1078-0432.CCR-19-1237

6.           Riess JW, Frankel P, Shackelford D, et al. Phase 1 trial of MLN0128 (sapanisertib) and CB-839 HCl (telaglenastat) in patients with advanced NSCLC (NCI 10327): Rationale and study design. Clin Lung Cancer. 2021;22:67-70. doi: 10.1016/j.cllc.2020.10.006

In a European Society for Medical Oncology Virtual Plenary session, Dr Paz-Ares and colleagues presented interim analysis of the PEARLS/KEYNOTE-091 study of adjuvant pembrolizumab. In this triple-blind phase 3 trial, 1177 patients with stage IB (tumor ≥ 4 cm) to IIIA non–small cell lung cancer (NSCLC) (per American Joint Committee on Cancer [AJCC], version 7) were randomly assigned to receive pembrolizumab vs placebo. The dual primary endpoints were disease-free survival (DFS) in the overall population and in the population with high programmed death-ligand 1 (PD-L1) (tumor proportion score [TPS] ≥ 50%). The study met its primary endpoint where improved DFS was observed in the overall population that included lung cancers, whether they were PD-L1–negative (TPS = 0%) or –positive (TPS  ≥ 1%) (53.6 months in the pembrolizumab group vs 42.0 months in the placebo group [hazard ratio (HR) 0.76; P = .0014]). Overall survival data are not yet clear. Of note, in the interim analysis presented, the subset of patients with high PD-L1 NSCLC (TPS ≥ 50%) did not show a DFS benefit whereas in other adjuvant and neoadjuvant studies, such as IMpower010 and CheckMate 816, the subset of high PD-L1 patients appeared to derive the most benefit. The results from the high PD-L1 subset and other subsets may change with future updated analyses as more events occur. The major co-primary endpoint was clearly met with the overall population clearly showing a positive DFS benefit. The results of the PEARLS trial adds to the current landscape of systemic treatment of early-stage NSCLC where neoadjuvant chemotherapy plus nivolumab is US Food and Drug Administration (FDA)–approved for stage IB (≥ 4 cm) to IIIA resected NSCLC regardless of level of PD-L1 expression, as is adjuvant atezolizumab after consideration of adjuvant chemotherapy in patients that are PD-L1–positive (≥ 1%) on the basis of a DFS benefit observed in this population.^1,2 For the future, it is important to see if the DFS benefit observed in these studies translates into a meaningful overall survival benefit.

Plasma cfDNA Levels as a Prognostic Marker in ALK+ NSCLC in the ALEX Trial

The ALEX trial is a pivotal global phase 3 randomized control trial that demonstrated superior progression-free survival (PFS) with the next-generation ALK inhibitor alectinib compared with the first-generation ALK inhibitor crizotinib as first-line treatment of ALK-positive NSCLC (HR 0.43; 95% CI 0.32-0.58; median PFS 34.8 vs 10.9 months crizotinib).³ In a study recently published in Clinical Cancer Research, Dr Dziadziuszko and colleagues retrospectively assessed the prognostic value of baseline cell-free DNA (cfDNA) levels in patients treated in the ALEX trial. Baseline plasma for cfDNA was quantified by the Foundation ACT next-generation sequencing assay. Clinical outcomes were assessed by quantitative cfDNA level stratified by the median value. In both the alectinib and crizotinib treatment arms, patients with cfDNA levels above the median were more likely to experience disease progression (alectinib adjusted HR 2.04; 95% CI 1.07-3.89; P = .03 and crizotinib adjusted HR 1.83; 95% CI 1.11-3.00, P = .016). Though survival data are incomplete, the study also suggested survival probability was lower when baseline cfDNA was above the median in both the alectinib and crizotinib treatment arms. Regardless of cfDNA levels, PFS was improved with alectinib compared with crizotinib. Previous studies have shown the value of cfDNA analysis at the time of progression to guide further treatment and target resistance mechanisms to ALK tyrosine kinase inhibitors (TKI), such as G1202R, or bypass tract pathways, such as MET amplification.^4,5 Assessment of the EML4-ALK variant type (V1 vs V3) has been shown to associate with certain types of resistance mechanisms (ie, on target ALK mutations, such as G1202R in V3) and clinical activity of specific ALK TKI (V3 > V1 for PFS with lorlatinib).⁶ This study examining baseline cfDNA levels and clinical outcomes on the ALEX trial shows the potential utility of baseline cfDNA levels as a prognostic factor for ALK TKI.

Lorlatinib in ROS1-Rearranged NSCLC After Progression on Prior ROS1 TKI

ROS1 rearrangements represent about 1.5% of lung adenocarcinoma. In advanced disease, both crizotinib and entrectinib are FDA-approved as agents targeting ROS1 with robust PFS. The third-generation TKI lorlatinib is approved and has substantial activity in ALK-rearranged NSCLC. In a recently published retrospective real-world cohort study by Girard and colleagues (LORLATU), 80 patients with ROS1-rearranged NSCLC were treated with lorlatinib as second-line treatment or beyond and after failure on at least one prior ROS1 TKI. Median PFS was 7.1 months (95% CI 5.0-9.9) and median overall survival was 19.6 months (95% CI 12.3-27.5). The overall response rate was 45% and the disease control rate was 82%. The central nervous system response rate was 72%. There were no new safety signals. This retrospective cohort study demonstrates that lorlatinib is a major targeted therapy treatment option in ROS1-rearranged NSCLC.

Checkmate 816: Neoadjuvant Nivolumab Plus Chemotherapy in Resectable NSCLC

In this open-label, phase 3 trial, 358 patients with stage IB (T ³ 4cm) to IIIA (per AJCC v7) resectable NSCLC were randomized 1:1 to receive nivolumab plus platinum-based chemotherapy or platinum-based chemotherapy alone for three cycles, followed by surgical resection. The primary endpoints were event-free survival (EFS) and pathological complete response (pCR) (0% viable tumor in resected lung and lymph nodes), both evaluated by blinded independent review. The median EFS was significantly increased in the nivolumab plus chemotherapy arm compared to chemotherapy alone: 31.6 months (95% CI 30.2 to not reached) vs 20.8 months (95% CI 14.0 to 26.7) (HR 0.63; 97.38% CI 0.43 to 0.91; P = .005). pCR rate was also increased in the nivolumab plus chemotherapy arm (24.0% vs 2.2%, respectively; odds ratio 13.94; 99% CI 3.49 to 55.75; P < .001). At the first prespecified interim analysis, the hazard ratio for death was 0.57 (99.67% CI 0.30 to 1.07), which currently does not meet the criterion for statistical significance. Of the randomized patients, 83.2% of those in the nivolumab-plus chemotherapy group and 75.4% of those in the chemotherapy-alone group were able to undergo surgery. Grade 3 or 4 treatment-related adverse events occurred in 33.5% of the patients in the nivolumab-plus-chemotherapy group and in 36.9% of those in the chemotherapy-alone group. In an exploratory analysis, EFS was longer in patients with pCR than patients without a pCR. In a subset analysis, patients with high PD-L1 expression (³50%) stood out in terms of particular benefit (HR 0.24, 95% CI 0.10–0.61). The Checkmate 816 trial is a landmark study. Neoadjuvant nivolumab plus chemotherapy represents a new standard of care in the systemic treatment of resectable NSCLC that is at a stage that warrants systemic treatment. It is FDA approved regardless of PD-L1 expression level including PD-L1 negative (0%) patients.² Adjuvant atezolizumab after adjuvant chemotherapy is also an FDA-approved treatment option for patients that are PD-L1 positive (³1%) based upon the IMpower 010 study.¹ It will be important to assess the overall survival benefit as the trial data matures, which seems to be trending in the right direction. Additional neoadjuvant clinical trials with chemoimmunotherapy have completed accrual and some of these trials also continued PD-(L)1 immune checkpoint inhibitor therapy in the adjuvant setting after surgery. An important question for the future is if combination of PD-(L)1 immune checkpoint blockade with chemotherapy in the neoadjuvant setting along with continuation of immunotherapy in the adjuvant setting post-surgery will further improve clinical outcomes.

References

1. Felip E, Altorki N, Zhou C, et al. Adjuvant atezolizumab after adjuvant chemotherapy in resected stage IB-IIIA non-small-cell lung cancer (IMpower010): a randomised, multicentre, open-label, phase 3 trial. Lancet. 2021;398(10308):1344-57. Doi: 10.1016/S0140-6736(21)02098-5  Source

2. Forde PM, Spicer J, Lu S, et al. Neoadjuvant nivolumab plus chemotherapy in resectable lung cancer. N Engl J Med. April 11, 2022. Doi: 10.1056/NEJMoa2202170 Source
    
3. Mok T, Camige DR, Gadgeel SM, et al. Updated overall survival and final progression-free survival data for patients with treatment-naive advanced ALK-positive non-small-cell lung cancer in the ALEX study. Ann Oncol. 2020;31:1056-1064. Doi: 10.1016/j.annonc.2020.04.478 Source

4. Shaw AT, Solomon BJ, Chiari R, et al. Lorlatinib in advanced ROS1-positive non-small-cell lung cancer: a multicentre, open-label, single-arm, phase 1-2 trial. Lancet Oncol. 2019;20:1691-1701. Doi: 10.1016/S1470-2045(19)30655-2 Source
    
5. Lawrence MN, Tamen RM, Martinez P, et al. SPACEWALK: A remote participation study of ALK resistance leveraging plasma cell-free DNA genotyping. JTO Clin Res Rep. 2021;2:100151. Doi: 10.1016/j.jtocrr.2021.100151 Source
    
6. Lin JJ, Zhu VW, Yoda S, et al. Impact of EML4-ALK variant on resistance mechanisms and clinical outcomes in ALK-positive lung cancer. J Clin Oncol. 2018;36:1199-1206. Doi: 10.1200/JCO.2017.76.2294 Source

In a European Society for Medical Oncology Virtual Plenary session, Dr Paz-Ares and colleagues presented interim analysis of the PEARLS/KEYNOTE-091 study of adjuvant pembrolizumab. In this triple-blind phase 3 trial, 1177 patients with stage IB (tumor ≥ 4 cm) to IIIA non–small cell lung cancer (NSCLC) (per American Joint Committee on Cancer [AJCC], version 7) were randomly assigned to receive pembrolizumab vs placebo. The dual primary endpoints were disease-free survival (DFS) in the overall population and in the population with high programmed death-ligand 1 (PD-L1) (tumor proportion score [TPS] ≥ 50%). The study met its primary endpoint where improved DFS was observed in the overall population that included lung cancers, whether they were PD-L1–negative (TPS = 0%) or –positive (TPS  ≥ 1%) (53.6 months in the pembrolizumab group vs 42.0 months in the placebo group [hazard ratio (HR) 0.76; P = .0014]). Overall survival data are not yet clear. Of note, in the interim analysis presented, the subset of patients with high PD-L1 NSCLC (TPS ≥ 50%) did not show a DFS benefit whereas in other adjuvant and neoadjuvant studies, such as IMpower010 and CheckMate 816, the subset of high PD-L1 patients appeared to derive the most benefit. The results from the high PD-L1 subset and other subsets may change with future updated analyses as more events occur. The major co-primary endpoint was clearly met with the overall population clearly showing a positive DFS benefit. The results of the PEARLS trial adds to the current landscape of systemic treatment of early-stage NSCLC where neoadjuvant chemotherapy plus nivolumab is US Food and Drug Administration (FDA)–approved for stage IB (≥ 4 cm) to IIIA resected NSCLC regardless of level of PD-L1 expression, as is adjuvant atezolizumab after consideration of adjuvant chemotherapy in patients that are PD-L1–positive (≥ 1%) on the basis of a DFS benefit observed in this population.^1,2 For the future, it is important to see if the DFS benefit observed in these studies translates into a meaningful overall survival benefit.

Plasma cfDNA Levels as a Prognostic Marker in ALK+ NSCLC in the ALEX Trial

The ALEX trial is a pivotal global phase 3 randomized control trial that demonstrated superior progression-free survival (PFS) with the next-generation ALK inhibitor alectinib compared with the first-generation ALK inhibitor crizotinib as first-line treatment of ALK-positive NSCLC (HR 0.43; 95% CI 0.32-0.58; median PFS 34.8 vs 10.9 months crizotinib).³ In a study recently published in Clinical Cancer Research, Dr Dziadziuszko and colleagues retrospectively assessed the prognostic value of baseline cell-free DNA (cfDNA) levels in patients treated in the ALEX trial. Baseline plasma for cfDNA was quantified by the Foundation ACT next-generation sequencing assay. Clinical outcomes were assessed by quantitative cfDNA level stratified by the median value. In both the alectinib and crizotinib treatment arms, patients with cfDNA levels above the median were more likely to experience disease progression (alectinib adjusted HR 2.04; 95% CI 1.07-3.89; P = .03 and crizotinib adjusted HR 1.83; 95% CI 1.11-3.00, P = .016). Though survival data are incomplete, the study also suggested survival probability was lower when baseline cfDNA was above the median in both the alectinib and crizotinib treatment arms. Regardless of cfDNA levels, PFS was improved with alectinib compared with crizotinib. Previous studies have shown the value of cfDNA analysis at the time of progression to guide further treatment and target resistance mechanisms to ALK tyrosine kinase inhibitors (TKI), such as G1202R, or bypass tract pathways, such as MET amplification.^4,5 Assessment of the EML4-ALK variant type (V1 vs V3) has been shown to associate with certain types of resistance mechanisms (ie, on target ALK mutations, such as G1202R in V3) and clinical activity of specific ALK TKI (V3 > V1 for PFS with lorlatinib).⁶ This study examining baseline cfDNA levels and clinical outcomes on the ALEX trial shows the potential utility of baseline cfDNA levels as a prognostic factor for ALK TKI.

Lorlatinib in ROS1-Rearranged NSCLC After Progression on Prior ROS1 TKI

ROS1 rearrangements represent about 1.5% of lung adenocarcinoma. In advanced disease, both crizotinib and entrectinib are FDA-approved as agents targeting ROS1 with robust PFS. The third-generation TKI lorlatinib is approved and has substantial activity in ALK-rearranged NSCLC. In a recently published retrospective real-world cohort study by Girard and colleagues (LORLATU), 80 patients with ROS1-rearranged NSCLC were treated with lorlatinib as second-line treatment or beyond and after failure on at least one prior ROS1 TKI. Median PFS was 7.1 months (95% CI 5.0-9.9) and median overall survival was 19.6 months (95% CI 12.3-27.5). The overall response rate was 45% and the disease control rate was 82%. The central nervous system response rate was 72%. There were no new safety signals. This retrospective cohort study demonstrates that lorlatinib is a major targeted therapy treatment option in ROS1-rearranged NSCLC.

Checkmate 816: Neoadjuvant Nivolumab Plus Chemotherapy in Resectable NSCLC

In this open-label, phase 3 trial, 358 patients with stage IB (T ³ 4cm) to IIIA (per AJCC v7) resectable NSCLC were randomized 1:1 to receive nivolumab plus platinum-based chemotherapy or platinum-based chemotherapy alone for three cycles, followed by surgical resection. The primary endpoints were event-free survival (EFS) and pathological complete response (pCR) (0% viable tumor in resected lung and lymph nodes), both evaluated by blinded independent review. The median EFS was significantly increased in the nivolumab plus chemotherapy arm compared to chemotherapy alone: 31.6 months (95% CI 30.2 to not reached) vs 20.8 months (95% CI 14.0 to 26.7) (HR 0.63; 97.38% CI 0.43 to 0.91; P = .005). pCR rate was also increased in the nivolumab plus chemotherapy arm (24.0% vs 2.2%, respectively; odds ratio 13.94; 99% CI 3.49 to 55.75; P < .001). At the first prespecified interim analysis, the hazard ratio for death was 0.57 (99.67% CI 0.30 to 1.07), which currently does not meet the criterion for statistical significance. Of the randomized patients, 83.2% of those in the nivolumab-plus chemotherapy group and 75.4% of those in the chemotherapy-alone group were able to undergo surgery. Grade 3 or 4 treatment-related adverse events occurred in 33.5% of the patients in the nivolumab-plus-chemotherapy group and in 36.9% of those in the chemotherapy-alone group. In an exploratory analysis, EFS was longer in patients with pCR than patients without a pCR. In a subset analysis, patients with high PD-L1 expression (³50%) stood out in terms of particular benefit (HR 0.24, 95% CI 0.10–0.61). The Checkmate 816 trial is a landmark study. Neoadjuvant nivolumab plus chemotherapy represents a new standard of care in the systemic treatment of resectable NSCLC that is at a stage that warrants systemic treatment. It is FDA approved regardless of PD-L1 expression level including PD-L1 negative (0%) patients.² Adjuvant atezolizumab after adjuvant chemotherapy is also an FDA-approved treatment option for patients that are PD-L1 positive (³1%) based upon the IMpower 010 study.¹ It will be important to assess the overall survival benefit as the trial data matures, which seems to be trending in the right direction. Additional neoadjuvant clinical trials with chemoimmunotherapy have completed accrual and some of these trials also continued PD-(L)1 immune checkpoint inhibitor therapy in the adjuvant setting after surgery. An important question for the future is if combination of PD-(L)1 immune checkpoint blockade with chemotherapy in the neoadjuvant setting along with continuation of immunotherapy in the adjuvant setting post-surgery will further improve clinical outcomes.

References

1. Felip E, Altorki N, Zhou C, et al. Adjuvant atezolizumab after adjuvant chemotherapy in resected stage IB-IIIA non-small-cell lung cancer (IMpower010): a randomised, multicentre, open-label, phase 3 trial. Lancet. 2021;398(10308):1344-57. Doi: 10.1016/S0140-6736(21)02098-5  Source

2. Forde PM, Spicer J, Lu S, et al. Neoadjuvant nivolumab plus chemotherapy in resectable lung cancer. N Engl J Med. April 11, 2022. Doi: 10.1056/NEJMoa2202170 Source
    
3. Mok T, Camige DR, Gadgeel SM, et al. Updated overall survival and final progression-free survival data for patients with treatment-naive advanced ALK-positive non-small-cell lung cancer in the ALEX study. Ann Oncol. 2020;31:1056-1064. Doi: 10.1016/j.annonc.2020.04.478 Source

4. Shaw AT, Solomon BJ, Chiari R, et al. Lorlatinib in advanced ROS1-positive non-small-cell lung cancer: a multicentre, open-label, single-arm, phase 1-2 trial. Lancet Oncol. 2019;20:1691-1701. Doi: 10.1016/S1470-2045(19)30655-2 Source
    
5. Lawrence MN, Tamen RM, Martinez P, et al. SPACEWALK: A remote participation study of ALK resistance leveraging plasma cell-free DNA genotyping. JTO Clin Res Rep. 2021;2:100151. Doi: 10.1016/j.jtocrr.2021.100151 Source
    
6. Lin JJ, Zhu VW, Yoda S, et al. Impact of EML4-ALK variant on resistance mechanisms and clinical outcomes in ALK-positive lung cancer. J Clin Oncol. 2018;36:1199-1206. Doi: 10.1200/JCO.2017.76.2294 Source

In a European Society for Medical Oncology Virtual Plenary session, Dr Paz-Ares and colleagues presented interim analysis of the PEARLS/KEYNOTE-091 study of adjuvant pembrolizumab. In this triple-blind phase 3 trial, 1177 patients with stage IB (tumor ≥ 4 cm) to IIIA non–small cell lung cancer (NSCLC) (per American Joint Committee on Cancer [AJCC], version 7) were randomly assigned to receive pembrolizumab vs placebo. The dual primary endpoints were disease-free survival (DFS) in the overall population and in the population with high programmed death-ligand 1 (PD-L1) (tumor proportion score [TPS] ≥ 50%). The study met its primary endpoint where improved DFS was observed in the overall population that included lung cancers, whether they were PD-L1–negative (TPS = 0%) or –positive (TPS  ≥ 1%) (53.6 months in the pembrolizumab group vs 42.0 months in the placebo group [hazard ratio (HR) 0.76; P = .0014]). Overall survival data are not yet clear. Of note, in the interim analysis presented, the subset of patients with high PD-L1 NSCLC (TPS ≥ 50%) did not show a DFS benefit whereas in other adjuvant and neoadjuvant studies, such as IMpower010 and CheckMate 816, the subset of high PD-L1 patients appeared to derive the most benefit. The results from the high PD-L1 subset and other subsets may change with future updated analyses as more events occur. The major co-primary endpoint was clearly met with the overall population clearly showing a positive DFS benefit. The results of the PEARLS trial adds to the current landscape of systemic treatment of early-stage NSCLC where neoadjuvant chemotherapy plus nivolumab is US Food and Drug Administration (FDA)–approved for stage IB (≥ 4 cm) to IIIA resected NSCLC regardless of level of PD-L1 expression, as is adjuvant atezolizumab after consideration of adjuvant chemotherapy in patients that are PD-L1–positive (≥ 1%) on the basis of a DFS benefit observed in this population.^1,2 For the future, it is important to see if the DFS benefit observed in these studies translates into a meaningful overall survival benefit.

Plasma cfDNA Levels as a Prognostic Marker in ALK+ NSCLC in the ALEX Trial

The ALEX trial is a pivotal global phase 3 randomized control trial that demonstrated superior progression-free survival (PFS) with the next-generation ALK inhibitor alectinib compared with the first-generation ALK inhibitor crizotinib as first-line treatment of ALK-positive NSCLC (HR 0.43; 95% CI 0.32-0.58; median PFS 34.8 vs 10.9 months crizotinib).³ In a study recently published in Clinical Cancer Research, Dr Dziadziuszko and colleagues retrospectively assessed the prognostic value of baseline cell-free DNA (cfDNA) levels in patients treated in the ALEX trial. Baseline plasma for cfDNA was quantified by the Foundation ACT next-generation sequencing assay. Clinical outcomes were assessed by quantitative cfDNA level stratified by the median value. In both the alectinib and crizotinib treatment arms, patients with cfDNA levels above the median were more likely to experience disease progression (alectinib adjusted HR 2.04; 95% CI 1.07-3.89; P = .03 and crizotinib adjusted HR 1.83; 95% CI 1.11-3.00, P = .016). Though survival data are incomplete, the study also suggested survival probability was lower when baseline cfDNA was above the median in both the alectinib and crizotinib treatment arms. Regardless of cfDNA levels, PFS was improved with alectinib compared with crizotinib. Previous studies have shown the value of cfDNA analysis at the time of progression to guide further treatment and target resistance mechanisms to ALK tyrosine kinase inhibitors (TKI), such as G1202R, or bypass tract pathways, such as MET amplification.^4,5 Assessment of the EML4-ALK variant type (V1 vs V3) has been shown to associate with certain types of resistance mechanisms (ie, on target ALK mutations, such as G1202R in V3) and clinical activity of specific ALK TKI (V3 > V1 for PFS with lorlatinib).⁶ This study examining baseline cfDNA levels and clinical outcomes on the ALEX trial shows the potential utility of baseline cfDNA levels as a prognostic factor for ALK TKI.

Lorlatinib in ROS1-Rearranged NSCLC After Progression on Prior ROS1 TKI

ROS1 rearrangements represent about 1.5% of lung adenocarcinoma. In advanced disease, both crizotinib and entrectinib are FDA-approved as agents targeting ROS1 with robust PFS. The third-generation TKI lorlatinib is approved and has substantial activity in ALK-rearranged NSCLC. In a recently published retrospective real-world cohort study by Girard and colleagues (LORLATU), 80 patients with ROS1-rearranged NSCLC were treated with lorlatinib as second-line treatment or beyond and after failure on at least one prior ROS1 TKI. Median PFS was 7.1 months (95% CI 5.0-9.9) and median overall survival was 19.6 months (95% CI 12.3-27.5). The overall response rate was 45% and the disease control rate was 82%. The central nervous system response rate was 72%. There were no new safety signals. This retrospective cohort study demonstrates that lorlatinib is a major targeted therapy treatment option in ROS1-rearranged NSCLC.

Checkmate 816: Neoadjuvant Nivolumab Plus Chemotherapy in Resectable NSCLC

In this open-label, phase 3 trial, 358 patients with stage IB (T ³ 4cm) to IIIA (per AJCC v7) resectable NSCLC were randomized 1:1 to receive nivolumab plus platinum-based chemotherapy or platinum-based chemotherapy alone for three cycles, followed by surgical resection. The primary endpoints were event-free survival (EFS) and pathological complete response (pCR) (0% viable tumor in resected lung and lymph nodes), both evaluated by blinded independent review. The median EFS was significantly increased in the nivolumab plus chemotherapy arm compared to chemotherapy alone: 31.6 months (95% CI 30.2 to not reached) vs 20.8 months (95% CI 14.0 to 26.7) (HR 0.63; 97.38% CI 0.43 to 0.91; P = .005). pCR rate was also increased in the nivolumab plus chemotherapy arm (24.0% vs 2.2%, respectively; odds ratio 13.94; 99% CI 3.49 to 55.75; P < .001). At the first prespecified interim analysis, the hazard ratio for death was 0.57 (99.67% CI 0.30 to 1.07), which currently does not meet the criterion for statistical significance. Of the randomized patients, 83.2% of those in the nivolumab-plus chemotherapy group and 75.4% of those in the chemotherapy-alone group were able to undergo surgery. Grade 3 or 4 treatment-related adverse events occurred in 33.5% of the patients in the nivolumab-plus-chemotherapy group and in 36.9% of those in the chemotherapy-alone group. In an exploratory analysis, EFS was longer in patients with pCR than patients without a pCR. In a subset analysis, patients with high PD-L1 expression (³50%) stood out in terms of particular benefit (HR 0.24, 95% CI 0.10–0.61). The Checkmate 816 trial is a landmark study. Neoadjuvant nivolumab plus chemotherapy represents a new standard of care in the systemic treatment of resectable NSCLC that is at a stage that warrants systemic treatment. It is FDA approved regardless of PD-L1 expression level including PD-L1 negative (0%) patients.² Adjuvant atezolizumab after adjuvant chemotherapy is also an FDA-approved treatment option for patients that are PD-L1 positive (³1%) based upon the IMpower 010 study.¹ It will be important to assess the overall survival benefit as the trial data matures, which seems to be trending in the right direction. Additional neoadjuvant clinical trials with chemoimmunotherapy have completed accrual and some of these trials also continued PD-(L)1 immune checkpoint inhibitor therapy in the adjuvant setting after surgery. An important question for the future is if combination of PD-(L)1 immune checkpoint blockade with chemotherapy in the neoadjuvant setting along with continuation of immunotherapy in the adjuvant setting post-surgery will further improve clinical outcomes.

References

1. Felip E, Altorki N, Zhou C, et al. Adjuvant atezolizumab after adjuvant chemotherapy in resected stage IB-IIIA non-small-cell lung cancer (IMpower010): a randomised, multicentre, open-label, phase 3 trial. Lancet. 2021;398(10308):1344-57. Doi: 10.1016/S0140-6736(21)02098-5  Source

2. Forde PM, Spicer J, Lu S, et al. Neoadjuvant nivolumab plus chemotherapy in resectable lung cancer. N Engl J Med. April 11, 2022. Doi: 10.1056/NEJMoa2202170 Source
    
3. Mok T, Camige DR, Gadgeel SM, et al. Updated overall survival and final progression-free survival data for patients with treatment-naive advanced ALK-positive non-small-cell lung cancer in the ALEX study. Ann Oncol. 2020;31:1056-1064. Doi: 10.1016/j.annonc.2020.04.478 Source

4. Shaw AT, Solomon BJ, Chiari R, et al. Lorlatinib in advanced ROS1-positive non-small-cell lung cancer: a multicentre, open-label, single-arm, phase 1-2 trial. Lancet Oncol. 2019;20:1691-1701. Doi: 10.1016/S1470-2045(19)30655-2 Source
    
5. Lawrence MN, Tamen RM, Martinez P, et al. SPACEWALK: A remote participation study of ALK resistance leveraging plasma cell-free DNA genotyping. JTO Clin Res Rep. 2021;2:100151. Doi: 10.1016/j.jtocrr.2021.100151 Source
    
6. Lin JJ, Zhu VW, Yoda S, et al. Impact of EML4-ALK variant on resistance mechanisms and clinical outcomes in ALK-positive lung cancer. J Clin Oncol. 2018;36:1199-1206. Doi: 10.1200/JCO.2017.76.2294 Source