Clinical Edge Commentary: Breast Cancer February 2021

Systemic therapy advances for metastatic breast cancer (MBC) have led to improved overall survival; however, the CNS sanctuary site can be challenging to treat and cause significant neurologic symptoms. Kuksis and colleagues reported that HER2-positive and triple-negative breast MBC subtypes have high incidence of brain metastases, with pooled cumulative incidences of 31% and 32%, respectively. The incidence per patient-year was 13% for both subtypes. The treatment landscape for HER2-positive MBC is rapidly evolving. The combination of tucatinib/capecitabine/trastuzumab demonstrated reduced risk of intracranial progression or death (HR 0.32), improvement in intracranial objective response rate (47.3% versus 20.0%) and reduced risk of death (0.58) in the HER2CLIMB study. An MRI screening program may enhance early detection and study prevention of brain metastases.

Trastuzumab and pertuzumab have significantly improved outcomes in early-stage and advanced HER2-positive breast cancer. These monoclonal antibodies are given with chemotherapy initially, followed by dual antibody therapy to complete one year for curative treatment and until disease progression in the metastatic setting. The FeDeriCa randomized phase 3 study demonstrated that fixed-dose subcutaneous combination of pertuzumab and trastuzumab was non-inferior to intravenous formulations with a geometric mean ratio of cycle 7 pertuzumab serum trough concentration of 1.22 (90% CI 1.14-1.31). Furthermore, efficacy appeared similar with pathologic complete response rates of 60% for both groups. Trastuzumab and pertuzumab administration in an infusion center requires hospital resources, cost, and patient’s time. The MetasphHER study showed that patients preferred subcutaneous trastuzumab compared to IV, and further investigation into long-term outcomes and impact on quality of life and resource allocation is desired.

The phase 3 CLEOPATRA study demonstrated improvement in overall survival with the addition of pertuzumab to docetaxel and trastuzumab in patients with HER2-positive MBC. Rash and diarrhea are well-recognized potential side effects related to pertuzumab. Ferreira et al demonstrated that rash was prognostic for PFS and OS both during and after docetaxel discontinuation, while diarrhea was only prognostic after docetaxel. Neither rash nor diarrhea were predictive of pertuzumab benefit. Studies have shown that patients who developed immune-related adverse events during anti-PD-1 treatment had PFS and OS benefit compared to those who did not. These results may help inform and encourage patients and providers regarding benefit of various treatments in the setting of toxicities. Future research exploring biomarker prognostic and predictive capability is certainly warranted. 

Endocrine therapy plus a CDK 4/6 inhibitor is standard first-line treatment for hormone receptor-positive MBC. Progression that occurs rapidly or through multiple lines of endocrine therapy combinations, may indicate endocrine resistance. The phase 3 PEARL trial did not demonstrate superior PFS among patients with wild type ESR1 AI-resistant MBC with palbociclib/endocrine therapy compared to capecitabine (mPFS 8.0 vs 10.6 months, adjusted HR 1.11; p=0.404); similar PFS and aHR were seen in palbociclib/fulvestrant versus capecitabine cohort. Therapy sequencing in HR+/HER2-negative MBC is indeed relevant, and a previous meta-analysis demonstrated chemotherapy was not better than endocrine therapy plus CDK 4/6 inhibitor in first- or second-line setting. Importantly, palbociclib plus endocrine therapy was associated with better tolerability and quality of life, which should be considered when selecting treatment with similar PFS outcomes.

References:

Lin NU, Borges V, Anders C, Murthy RK, Paplomata E, Hamilton E, Hurvitz S, Loi S, Okines A, Abramson V, Bedard PL, Oliveira M, Mueller V, Zelnak A, DiGiovanna MP, Bachelot T, Chien AJ, O'Regan R, Wardley A, Conlin A, Cameron D, Carey L, Curigliano G, Gelmon K, Loibl S, Mayor J, McGoldrick S, An X, Winer EP. Intracranial efficacy and survival with tucatinib plus trastuzumab and capecitabine for previously treated HER2-positive breast cancer with brain metastases in the HER2CLIMB trial. J Clin Oncol. 2020;38:2610-2619.

Pivot X, Spano JP, Espie M, Cottu P, Jouannaud C, Pottier V, Moreau L, Extra JM, Lortholary A, Rivera P, Spaeth D, Attar-Rabia H, Benkanoun C, Dima-Martinez L, Esposito N, Gligorov J. Patients' preference of trastuzumab administration (subcutaneous versus intravenous) in HER2-positive metastatic breast cancer: Results of the randomised MetaspHer study. Eur J Cancer. 2017;82:230-236.

Das S, Ciombor KK, Haraldsdottir S, Pumpalova Y, Sahin IH, Pineda G, Shyr Y, Lin EP, Hsu CY, Chu SK, Goff LW, Cardin DB, Bilen MA, Fisher GA, Wu C, Berlin J. Immune-related adverse events and immune checkpoint inhibitor efficacy in patients with gastrointestinal cancer with Food and Drug Administration-approved indications for immunotherapy. Oncologist. 2020;25:669-679.

Giuliano M, Schettini F, Rognoni C, Milani M, Jerusalem G, Bachelot T, De Laurentiis M, Thomas G, De Placido P, Arpino G, De Placido S, Cristofanilli M, Giordano A, Puglisi F, Pistilli B, Prat A, Del Mastro L, Venturini S, Generali D. Endocrine treatment versus chemotherapy in postmenopausal women with hormone receptor-positive, HER2-negative, metastatic breast cancer: a systematic review and network meta-analysis. Lancet Oncol. 2019;20:1360-1369.

Systemic therapy advances for metastatic breast cancer (MBC) have led to improved overall survival; however, the CNS sanctuary site can be challenging to treat and cause significant neurologic symptoms. Kuksis and colleagues reported that HER2-positive and triple-negative breast MBC subtypes have high incidence of brain metastases, with pooled cumulative incidences of 31% and 32%, respectively. The incidence per patient-year was 13% for both subtypes. The treatment landscape for HER2-positive MBC is rapidly evolving. The combination of tucatinib/capecitabine/trastuzumab demonstrated reduced risk of intracranial progression or death (HR 0.32), improvement in intracranial objective response rate (47.3% versus 20.0%) and reduced risk of death (0.58) in the HER2CLIMB study. An MRI screening program may enhance early detection and study prevention of brain metastases.

Trastuzumab and pertuzumab have significantly improved outcomes in early-stage and advanced HER2-positive breast cancer. These monoclonal antibodies are given with chemotherapy initially, followed by dual antibody therapy to complete one year for curative treatment and until disease progression in the metastatic setting. The FeDeriCa randomized phase 3 study demonstrated that fixed-dose subcutaneous combination of pertuzumab and trastuzumab was non-inferior to intravenous formulations with a geometric mean ratio of cycle 7 pertuzumab serum trough concentration of 1.22 (90% CI 1.14-1.31). Furthermore, efficacy appeared similar with pathologic complete response rates of 60% for both groups. Trastuzumab and pertuzumab administration in an infusion center requires hospital resources, cost, and patient’s time. The MetasphHER study showed that patients preferred subcutaneous trastuzumab compared to IV, and further investigation into long-term outcomes and impact on quality of life and resource allocation is desired.

The phase 3 CLEOPATRA study demonstrated improvement in overall survival with the addition of pertuzumab to docetaxel and trastuzumab in patients with HER2-positive MBC. Rash and diarrhea are well-recognized potential side effects related to pertuzumab. Ferreira et al demonstrated that rash was prognostic for PFS and OS both during and after docetaxel discontinuation, while diarrhea was only prognostic after docetaxel. Neither rash nor diarrhea were predictive of pertuzumab benefit. Studies have shown that patients who developed immune-related adverse events during anti-PD-1 treatment had PFS and OS benefit compared to those who did not. These results may help inform and encourage patients and providers regarding benefit of various treatments in the setting of toxicities. Future research exploring biomarker prognostic and predictive capability is certainly warranted. 

Endocrine therapy plus a CDK 4/6 inhibitor is standard first-line treatment for hormone receptor-positive MBC. Progression that occurs rapidly or through multiple lines of endocrine therapy combinations, may indicate endocrine resistance. The phase 3 PEARL trial did not demonstrate superior PFS among patients with wild type ESR1 AI-resistant MBC with palbociclib/endocrine therapy compared to capecitabine (mPFS 8.0 vs 10.6 months, adjusted HR 1.11; p=0.404); similar PFS and aHR were seen in palbociclib/fulvestrant versus capecitabine cohort. Therapy sequencing in HR+/HER2-negative MBC is indeed relevant, and a previous meta-analysis demonstrated chemotherapy was not better than endocrine therapy plus CDK 4/6 inhibitor in first- or second-line setting. Importantly, palbociclib plus endocrine therapy was associated with better tolerability and quality of life, which should be considered when selecting treatment with similar PFS outcomes.

References:

Lin NU, Borges V, Anders C, Murthy RK, Paplomata E, Hamilton E, Hurvitz S, Loi S, Okines A, Abramson V, Bedard PL, Oliveira M, Mueller V, Zelnak A, DiGiovanna MP, Bachelot T, Chien AJ, O'Regan R, Wardley A, Conlin A, Cameron D, Carey L, Curigliano G, Gelmon K, Loibl S, Mayor J, McGoldrick S, An X, Winer EP. Intracranial efficacy and survival with tucatinib plus trastuzumab and capecitabine for previously treated HER2-positive breast cancer with brain metastases in the HER2CLIMB trial. J Clin Oncol. 2020;38:2610-2619.

Pivot X, Spano JP, Espie M, Cottu P, Jouannaud C, Pottier V, Moreau L, Extra JM, Lortholary A, Rivera P, Spaeth D, Attar-Rabia H, Benkanoun C, Dima-Martinez L, Esposito N, Gligorov J. Patients' preference of trastuzumab administration (subcutaneous versus intravenous) in HER2-positive metastatic breast cancer: Results of the randomised MetaspHer study. Eur J Cancer. 2017;82:230-236.

Das S, Ciombor KK, Haraldsdottir S, Pumpalova Y, Sahin IH, Pineda G, Shyr Y, Lin EP, Hsu CY, Chu SK, Goff LW, Cardin DB, Bilen MA, Fisher GA, Wu C, Berlin J. Immune-related adverse events and immune checkpoint inhibitor efficacy in patients with gastrointestinal cancer with Food and Drug Administration-approved indications for immunotherapy. Oncologist. 2020;25:669-679.

Giuliano M, Schettini F, Rognoni C, Milani M, Jerusalem G, Bachelot T, De Laurentiis M, Thomas G, De Placido P, Arpino G, De Placido S, Cristofanilli M, Giordano A, Puglisi F, Pistilli B, Prat A, Del Mastro L, Venturini S, Generali D. Endocrine treatment versus chemotherapy in postmenopausal women with hormone receptor-positive, HER2-negative, metastatic breast cancer: a systematic review and network meta-analysis. Lancet Oncol. 2019;20:1360-1369.

Systemic therapy advances for metastatic breast cancer (MBC) have led to improved overall survival; however, the CNS sanctuary site can be challenging to treat and cause significant neurologic symptoms. Kuksis and colleagues reported that HER2-positive and triple-negative breast MBC subtypes have high incidence of brain metastases, with pooled cumulative incidences of 31% and 32%, respectively. The incidence per patient-year was 13% for both subtypes. The treatment landscape for HER2-positive MBC is rapidly evolving. The combination of tucatinib/capecitabine/trastuzumab demonstrated reduced risk of intracranial progression or death (HR 0.32), improvement in intracranial objective response rate (47.3% versus 20.0%) and reduced risk of death (0.58) in the HER2CLIMB study. An MRI screening program may enhance early detection and study prevention of brain metastases.

Trastuzumab and pertuzumab have significantly improved outcomes in early-stage and advanced HER2-positive breast cancer. These monoclonal antibodies are given with chemotherapy initially, followed by dual antibody therapy to complete one year for curative treatment and until disease progression in the metastatic setting. The FeDeriCa randomized phase 3 study demonstrated that fixed-dose subcutaneous combination of pertuzumab and trastuzumab was non-inferior to intravenous formulations with a geometric mean ratio of cycle 7 pertuzumab serum trough concentration of 1.22 (90% CI 1.14-1.31). Furthermore, efficacy appeared similar with pathologic complete response rates of 60% for both groups. Trastuzumab and pertuzumab administration in an infusion center requires hospital resources, cost, and patient’s time. The MetasphHER study showed that patients preferred subcutaneous trastuzumab compared to IV, and further investigation into long-term outcomes and impact on quality of life and resource allocation is desired.

The phase 3 CLEOPATRA study demonstrated improvement in overall survival with the addition of pertuzumab to docetaxel and trastuzumab in patients with HER2-positive MBC. Rash and diarrhea are well-recognized potential side effects related to pertuzumab. Ferreira et al demonstrated that rash was prognostic for PFS and OS both during and after docetaxel discontinuation, while diarrhea was only prognostic after docetaxel. Neither rash nor diarrhea were predictive of pertuzumab benefit. Studies have shown that patients who developed immune-related adverse events during anti-PD-1 treatment had PFS and OS benefit compared to those who did not. These results may help inform and encourage patients and providers regarding benefit of various treatments in the setting of toxicities. Future research exploring biomarker prognostic and predictive capability is certainly warranted. 

Endocrine therapy plus a CDK 4/6 inhibitor is standard first-line treatment for hormone receptor-positive MBC. Progression that occurs rapidly or through multiple lines of endocrine therapy combinations, may indicate endocrine resistance. The phase 3 PEARL trial did not demonstrate superior PFS among patients with wild type ESR1 AI-resistant MBC with palbociclib/endocrine therapy compared to capecitabine (mPFS 8.0 vs 10.6 months, adjusted HR 1.11; p=0.404); similar PFS and aHR were seen in palbociclib/fulvestrant versus capecitabine cohort. Therapy sequencing in HR+/HER2-negative MBC is indeed relevant, and a previous meta-analysis demonstrated chemotherapy was not better than endocrine therapy plus CDK 4/6 inhibitor in first- or second-line setting. Importantly, palbociclib plus endocrine therapy was associated with better tolerability and quality of life, which should be considered when selecting treatment with similar PFS outcomes.

References:

Lin NU, Borges V, Anders C, Murthy RK, Paplomata E, Hamilton E, Hurvitz S, Loi S, Okines A, Abramson V, Bedard PL, Oliveira M, Mueller V, Zelnak A, DiGiovanna MP, Bachelot T, Chien AJ, O'Regan R, Wardley A, Conlin A, Cameron D, Carey L, Curigliano G, Gelmon K, Loibl S, Mayor J, McGoldrick S, An X, Winer EP. Intracranial efficacy and survival with tucatinib plus trastuzumab and capecitabine for previously treated HER2-positive breast cancer with brain metastases in the HER2CLIMB trial. J Clin Oncol. 2020;38:2610-2619.

Pivot X, Spano JP, Espie M, Cottu P, Jouannaud C, Pottier V, Moreau L, Extra JM, Lortholary A, Rivera P, Spaeth D, Attar-Rabia H, Benkanoun C, Dima-Martinez L, Esposito N, Gligorov J. Patients' preference of trastuzumab administration (subcutaneous versus intravenous) in HER2-positive metastatic breast cancer: Results of the randomised MetaspHer study. Eur J Cancer. 2017;82:230-236.

Das S, Ciombor KK, Haraldsdottir S, Pumpalova Y, Sahin IH, Pineda G, Shyr Y, Lin EP, Hsu CY, Chu SK, Goff LW, Cardin DB, Bilen MA, Fisher GA, Wu C, Berlin J. Immune-related adverse events and immune checkpoint inhibitor efficacy in patients with gastrointestinal cancer with Food and Drug Administration-approved indications for immunotherapy. Oncologist. 2020;25:669-679.

Giuliano M, Schettini F, Rognoni C, Milani M, Jerusalem G, Bachelot T, De Laurentiis M, Thomas G, De Placido P, Arpino G, De Placido S, Cristofanilli M, Giordano A, Puglisi F, Pistilli B, Prat A, Del Mastro L, Venturini S, Generali D. Endocrine treatment versus chemotherapy in postmenopausal women with hormone receptor-positive, HER2-negative, metastatic breast cancer: a systematic review and network meta-analysis. Lancet Oncol. 2019;20:1360-1369.