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Role of Prophylactic Cranial Irradiation in Small Cell Carcinoma of Urinary Bladder: Case Report and Literature Review
INTRODUCTION
Urinary bladder is an extremely rare site of extrapulmonary small cell cancer (EPSCC). Unlike small cell lung cancer (SCLC), there is no clear guideline for prophylactic cranial irradiation (PCI) for EPSCC. In this case report and literature review, we discuss small cell cancer of urinary bladder (SCCUB) and the role of PCI in SCCUB.
CASE PRESENTATION
A 74-year-old male presented with gross hematuria and an unremarkable physical examination. CT showed 1.7 cm right anterolateral bladder wall thickening. Cystoscopy revealed a 2-3 cm high-grade bladder lesion. Pathology from transurethral resection of the tumor was consistent with T1N0M0 small cell carcinoma. MRI brain and FDG-PET showed no extravesical disease. Patient received four cycles of neoadjuvant carboplatin/etoposide per his preference as he wanted to protect his hearing due to his profession followed by radical cystoprostatectomy. Post-op pathology showed clear margins. We decided to forego PCI in favor of interval surveillance with MRI and follow- up images remain negative for distant metastases.
DISCUSSION
EPSCC accounts for 2.5-5% of all SCC, very rare in male genitourinary tract. Treatment approach is derived from SCLC, guided by extent of disease and patient’s functional status. Role of PCI in EPSCC has not been clearly described, and even less evidence is available for SCCUB. From a review of eleven studies in PubMed for the role of PCI in SCCUB or EPSCC, we found that SCCUB has lower incidence of brain metastases than SCLC. One study suggested that SCCUB arises from totipotent cells in the submucosa, unlike Kulchitsky cell origin of SCLC. This difference might explain the difference in their metastatic behavior. With this background, PCI is not routinely recommended for limited- stage SCCUB. There might still be a role for PCI in extensive SCCUB with high metastatic burden. More studies are needed to update the guidelines for the role of PCI for these tumors.
CONCLUSIONS
Per this literature review, PCI is not routinely recommended for SCCUB, likely due to different cells of origin compared to SCLC. Future studies should focus on characterizing differences in their metastatic behavior and updating guidelines for PCI for SCCUB.
INTRODUCTION
Urinary bladder is an extremely rare site of extrapulmonary small cell cancer (EPSCC). Unlike small cell lung cancer (SCLC), there is no clear guideline for prophylactic cranial irradiation (PCI) for EPSCC. In this case report and literature review, we discuss small cell cancer of urinary bladder (SCCUB) and the role of PCI in SCCUB.
CASE PRESENTATION
A 74-year-old male presented with gross hematuria and an unremarkable physical examination. CT showed 1.7 cm right anterolateral bladder wall thickening. Cystoscopy revealed a 2-3 cm high-grade bladder lesion. Pathology from transurethral resection of the tumor was consistent with T1N0M0 small cell carcinoma. MRI brain and FDG-PET showed no extravesical disease. Patient received four cycles of neoadjuvant carboplatin/etoposide per his preference as he wanted to protect his hearing due to his profession followed by radical cystoprostatectomy. Post-op pathology showed clear margins. We decided to forego PCI in favor of interval surveillance with MRI and follow- up images remain negative for distant metastases.
DISCUSSION
EPSCC accounts for 2.5-5% of all SCC, very rare in male genitourinary tract. Treatment approach is derived from SCLC, guided by extent of disease and patient’s functional status. Role of PCI in EPSCC has not been clearly described, and even less evidence is available for SCCUB. From a review of eleven studies in PubMed for the role of PCI in SCCUB or EPSCC, we found that SCCUB has lower incidence of brain metastases than SCLC. One study suggested that SCCUB arises from totipotent cells in the submucosa, unlike Kulchitsky cell origin of SCLC. This difference might explain the difference in their metastatic behavior. With this background, PCI is not routinely recommended for limited- stage SCCUB. There might still be a role for PCI in extensive SCCUB with high metastatic burden. More studies are needed to update the guidelines for the role of PCI for these tumors.
CONCLUSIONS
Per this literature review, PCI is not routinely recommended for SCCUB, likely due to different cells of origin compared to SCLC. Future studies should focus on characterizing differences in their metastatic behavior and updating guidelines for PCI for SCCUB.
INTRODUCTION
Urinary bladder is an extremely rare site of extrapulmonary small cell cancer (EPSCC). Unlike small cell lung cancer (SCLC), there is no clear guideline for prophylactic cranial irradiation (PCI) for EPSCC. In this case report and literature review, we discuss small cell cancer of urinary bladder (SCCUB) and the role of PCI in SCCUB.
CASE PRESENTATION
A 74-year-old male presented with gross hematuria and an unremarkable physical examination. CT showed 1.7 cm right anterolateral bladder wall thickening. Cystoscopy revealed a 2-3 cm high-grade bladder lesion. Pathology from transurethral resection of the tumor was consistent with T1N0M0 small cell carcinoma. MRI brain and FDG-PET showed no extravesical disease. Patient received four cycles of neoadjuvant carboplatin/etoposide per his preference as he wanted to protect his hearing due to his profession followed by radical cystoprostatectomy. Post-op pathology showed clear margins. We decided to forego PCI in favor of interval surveillance with MRI and follow- up images remain negative for distant metastases.
DISCUSSION
EPSCC accounts for 2.5-5% of all SCC, very rare in male genitourinary tract. Treatment approach is derived from SCLC, guided by extent of disease and patient’s functional status. Role of PCI in EPSCC has not been clearly described, and even less evidence is available for SCCUB. From a review of eleven studies in PubMed for the role of PCI in SCCUB or EPSCC, we found that SCCUB has lower incidence of brain metastases than SCLC. One study suggested that SCCUB arises from totipotent cells in the submucosa, unlike Kulchitsky cell origin of SCLC. This difference might explain the difference in their metastatic behavior. With this background, PCI is not routinely recommended for limited- stage SCCUB. There might still be a role for PCI in extensive SCCUB with high metastatic burden. More studies are needed to update the guidelines for the role of PCI for these tumors.
CONCLUSIONS
Per this literature review, PCI is not routinely recommended for SCCUB, likely due to different cells of origin compared to SCLC. Future studies should focus on characterizing differences in their metastatic behavior and updating guidelines for PCI for SCCUB.
Metastatic Urothelial Carcinoma Presenting as Mediastinal Lymphadenopathy Without Appreciable Bladder Mass in a Patient With Chronic Lymphocytic Leukemia
INTRODUCTION
Lymphadenopathy in Chronic Lymphocytic Leukemia (CLL) is a very common feature. However, sudden increase in lymphadenopathy or other symptoms like weight loss should be evaluated for possible metastatic malignancy. We describe a CLL patient with diffuse mediastinal lymphadenopathy who was diagnosed with metastatic bladder cancer without a primary bladder tumor mass on imaging.
CASE DESCRIPTION
A 60-year-old man with a 60 pack-year smoking history, alcoholic cirrhosis, and a 5-year history of stage 1 CLL presented with 3 months of progressive shortness of breath; persistent cough; chills; hemoptysis; and a steady weight loss of 35 lbs. Notably, he had no bladder symptoms. Initial labs showed leukocytosis of 35.8k with a lymphocytic predominance. Screening low-dose chest CT was positive for diffuse mediastinal lymphadenopathy. Subsequent PET/CT revealed numerous hypermetabolic lymph nodes in the neck, mediastinum, left hilum, and right periaortic abdominal region. CT Chest, Abdomen, Pelvis revealed progressive lymphadenopathy as seen in prior imaging, stable pulmonary nodules up to 4 mm in size, and splenomegaly. No distant primary sites, including of the bladder, were identified. Mediastinal lymph node biopsy confirmed metastatic poorly differentiated carcinoma with immunohistochemical staining negative for p40, p63, CK20, TTF-1, Napsin A, CDX2, CA19- 9, Calretinin, and D2-40 and positive for CK7, GATA3, Ber-EP4, and Uroplakin, supporting bladder as primary origin. Urology deferred a cystoscopy given his lack of urinary symptoms and positive biopsy and was started on Carboplatin/Gemcitabine for his metastatic disease. He was ineligible for Cisplatin given his cirrhosis and hearing impairment.
DISCUSSION
In patients with CLL, new onset mediastinal lymphadenopathy is concerning for disease progression and possible transformation to a diffuse b-cell lymphoma. However, this symptom has a broad differential, including primary lung carcinomas, sarcomas, and metastatic disease. While our patient’s PET/CT and pan-CT failed to identify a distant primary site, maintaining a low clinical suspicion for metastatic disease and doing a thorough work-up was paramount. Only through immunohistochemical staining were we able to diagnosis this patient with urothelial carcinoma.
CONCLUSIONS
Biopsy with immunohistochemical staining and maintaining a low suspicion for worsening lymphadenopathy can identify unusually presenting urothelial carcinomas in CLL patients.
INTRODUCTION
Lymphadenopathy in Chronic Lymphocytic Leukemia (CLL) is a very common feature. However, sudden increase in lymphadenopathy or other symptoms like weight loss should be evaluated for possible metastatic malignancy. We describe a CLL patient with diffuse mediastinal lymphadenopathy who was diagnosed with metastatic bladder cancer without a primary bladder tumor mass on imaging.
CASE DESCRIPTION
A 60-year-old man with a 60 pack-year smoking history, alcoholic cirrhosis, and a 5-year history of stage 1 CLL presented with 3 months of progressive shortness of breath; persistent cough; chills; hemoptysis; and a steady weight loss of 35 lbs. Notably, he had no bladder symptoms. Initial labs showed leukocytosis of 35.8k with a lymphocytic predominance. Screening low-dose chest CT was positive for diffuse mediastinal lymphadenopathy. Subsequent PET/CT revealed numerous hypermetabolic lymph nodes in the neck, mediastinum, left hilum, and right periaortic abdominal region. CT Chest, Abdomen, Pelvis revealed progressive lymphadenopathy as seen in prior imaging, stable pulmonary nodules up to 4 mm in size, and splenomegaly. No distant primary sites, including of the bladder, were identified. Mediastinal lymph node biopsy confirmed metastatic poorly differentiated carcinoma with immunohistochemical staining negative for p40, p63, CK20, TTF-1, Napsin A, CDX2, CA19- 9, Calretinin, and D2-40 and positive for CK7, GATA3, Ber-EP4, and Uroplakin, supporting bladder as primary origin. Urology deferred a cystoscopy given his lack of urinary symptoms and positive biopsy and was started on Carboplatin/Gemcitabine for his metastatic disease. He was ineligible for Cisplatin given his cirrhosis and hearing impairment.
DISCUSSION
In patients with CLL, new onset mediastinal lymphadenopathy is concerning for disease progression and possible transformation to a diffuse b-cell lymphoma. However, this symptom has a broad differential, including primary lung carcinomas, sarcomas, and metastatic disease. While our patient’s PET/CT and pan-CT failed to identify a distant primary site, maintaining a low clinical suspicion for metastatic disease and doing a thorough work-up was paramount. Only through immunohistochemical staining were we able to diagnosis this patient with urothelial carcinoma.
CONCLUSIONS
Biopsy with immunohistochemical staining and maintaining a low suspicion for worsening lymphadenopathy can identify unusually presenting urothelial carcinomas in CLL patients.
INTRODUCTION
Lymphadenopathy in Chronic Lymphocytic Leukemia (CLL) is a very common feature. However, sudden increase in lymphadenopathy or other symptoms like weight loss should be evaluated for possible metastatic malignancy. We describe a CLL patient with diffuse mediastinal lymphadenopathy who was diagnosed with metastatic bladder cancer without a primary bladder tumor mass on imaging.
CASE DESCRIPTION
A 60-year-old man with a 60 pack-year smoking history, alcoholic cirrhosis, and a 5-year history of stage 1 CLL presented with 3 months of progressive shortness of breath; persistent cough; chills; hemoptysis; and a steady weight loss of 35 lbs. Notably, he had no bladder symptoms. Initial labs showed leukocytosis of 35.8k with a lymphocytic predominance. Screening low-dose chest CT was positive for diffuse mediastinal lymphadenopathy. Subsequent PET/CT revealed numerous hypermetabolic lymph nodes in the neck, mediastinum, left hilum, and right periaortic abdominal region. CT Chest, Abdomen, Pelvis revealed progressive lymphadenopathy as seen in prior imaging, stable pulmonary nodules up to 4 mm in size, and splenomegaly. No distant primary sites, including of the bladder, were identified. Mediastinal lymph node biopsy confirmed metastatic poorly differentiated carcinoma with immunohistochemical staining negative for p40, p63, CK20, TTF-1, Napsin A, CDX2, CA19- 9, Calretinin, and D2-40 and positive for CK7, GATA3, Ber-EP4, and Uroplakin, supporting bladder as primary origin. Urology deferred a cystoscopy given his lack of urinary symptoms and positive biopsy and was started on Carboplatin/Gemcitabine for his metastatic disease. He was ineligible for Cisplatin given his cirrhosis and hearing impairment.
DISCUSSION
In patients with CLL, new onset mediastinal lymphadenopathy is concerning for disease progression and possible transformation to a diffuse b-cell lymphoma. However, this symptom has a broad differential, including primary lung carcinomas, sarcomas, and metastatic disease. While our patient’s PET/CT and pan-CT failed to identify a distant primary site, maintaining a low clinical suspicion for metastatic disease and doing a thorough work-up was paramount. Only through immunohistochemical staining were we able to diagnosis this patient with urothelial carcinoma.
CONCLUSIONS
Biopsy with immunohistochemical staining and maintaining a low suspicion for worsening lymphadenopathy can identify unusually presenting urothelial carcinomas in CLL patients.
A Rare Case of HHV8+ Multicentric Castleman Disease Presenting as Dermatitis
Introduction
Castleman disease (CD) is a rare non-neoplastic disorder presenting as lymphadenopathy. Skin involvement and progression to lymphomas are uncommon, and such presentation can pose a diagnostic challenge. We describe an interesting case of multicentric CD presenting as a rash.
Case Description
A 79-year-old male presented with a 1-year history of blanchable maculopapular rash and new onset dyspnea in the absence of fever, fatigue or weight loss. Examination revealed axillary, cervical and inguinal lymphadenopathy, and firm splenomegaly. Initial labs were notable for leukocytosis, occasional lymphoplasmacytic cells, anemia, thrombocytopenia, negative HIV screen, and elevated ESR and LDH. Further testing identified polyclonal hypergammaglobulinemia. CT scans revealed generalized lymphadenopathy, splenomegaly with infarcts and unilateral pleural effusion. An inguinal lymph node needle biopsy, skin biopsy and pleural fluid cytology were concerning for lymphoplasmacytic, so he was started on rituximab and bendamustine. However, B cell clonality could not be demonstrated, making these findings concerning for Castleman disease.
Results
Human herpesvirus 8 (HHV-8) testing performed on the inguinal lymph node sample came out positive, and he was diagnosed with HHV-8 positive multicentric Castleman disease and continued on weekly rituximab. He demonstrated an excellent response with complete resolution of rash, palpable lymphadenopathy and anemia after 4 cycles of treatment.
Discussion
Castleman disease (CD) is a rare disorder of polyclonal B cell proliferation classically presenting as lymphadenopathy with constitutional symptoms. Cutaneous presentations include eruptive angiomas or petechial rash but can be variable. Intrinsic or viral IL-6 play a key role in the pathogenesis of the disease. CD can be localised or multicentric (related to HHV-8 +/- HIV or idiopathic), and these subtypes differ in prognosis and management, with HIV and HHV-8 co-positivity indicating worse outcomes. While human IL-6 in unicentric and idiopathic multicentric disease respond well to IL-6 receptor antagonists, viral IL-6 in HHV-8 associated cases has a limited response. This is the rationale for preferring anti-CD20 therapy with rituximab in these patients.
Conculsions
Correct biopsy specimen, keen analysis of distinct pathologic features, and HHV-8 testing on tissue sample guide the diagnosis as HHV-8 serology can be falsely negative.
Introduction
Castleman disease (CD) is a rare non-neoplastic disorder presenting as lymphadenopathy. Skin involvement and progression to lymphomas are uncommon, and such presentation can pose a diagnostic challenge. We describe an interesting case of multicentric CD presenting as a rash.
Case Description
A 79-year-old male presented with a 1-year history of blanchable maculopapular rash and new onset dyspnea in the absence of fever, fatigue or weight loss. Examination revealed axillary, cervical and inguinal lymphadenopathy, and firm splenomegaly. Initial labs were notable for leukocytosis, occasional lymphoplasmacytic cells, anemia, thrombocytopenia, negative HIV screen, and elevated ESR and LDH. Further testing identified polyclonal hypergammaglobulinemia. CT scans revealed generalized lymphadenopathy, splenomegaly with infarcts and unilateral pleural effusion. An inguinal lymph node needle biopsy, skin biopsy and pleural fluid cytology were concerning for lymphoplasmacytic, so he was started on rituximab and bendamustine. However, B cell clonality could not be demonstrated, making these findings concerning for Castleman disease.
Results
Human herpesvirus 8 (HHV-8) testing performed on the inguinal lymph node sample came out positive, and he was diagnosed with HHV-8 positive multicentric Castleman disease and continued on weekly rituximab. He demonstrated an excellent response with complete resolution of rash, palpable lymphadenopathy and anemia after 4 cycles of treatment.
Discussion
Castleman disease (CD) is a rare disorder of polyclonal B cell proliferation classically presenting as lymphadenopathy with constitutional symptoms. Cutaneous presentations include eruptive angiomas or petechial rash but can be variable. Intrinsic or viral IL-6 play a key role in the pathogenesis of the disease. CD can be localised or multicentric (related to HHV-8 +/- HIV or idiopathic), and these subtypes differ in prognosis and management, with HIV and HHV-8 co-positivity indicating worse outcomes. While human IL-6 in unicentric and idiopathic multicentric disease respond well to IL-6 receptor antagonists, viral IL-6 in HHV-8 associated cases has a limited response. This is the rationale for preferring anti-CD20 therapy with rituximab in these patients.
Conculsions
Correct biopsy specimen, keen analysis of distinct pathologic features, and HHV-8 testing on tissue sample guide the diagnosis as HHV-8 serology can be falsely negative.
Introduction
Castleman disease (CD) is a rare non-neoplastic disorder presenting as lymphadenopathy. Skin involvement and progression to lymphomas are uncommon, and such presentation can pose a diagnostic challenge. We describe an interesting case of multicentric CD presenting as a rash.
Case Description
A 79-year-old male presented with a 1-year history of blanchable maculopapular rash and new onset dyspnea in the absence of fever, fatigue or weight loss. Examination revealed axillary, cervical and inguinal lymphadenopathy, and firm splenomegaly. Initial labs were notable for leukocytosis, occasional lymphoplasmacytic cells, anemia, thrombocytopenia, negative HIV screen, and elevated ESR and LDH. Further testing identified polyclonal hypergammaglobulinemia. CT scans revealed generalized lymphadenopathy, splenomegaly with infarcts and unilateral pleural effusion. An inguinal lymph node needle biopsy, skin biopsy and pleural fluid cytology were concerning for lymphoplasmacytic, so he was started on rituximab and bendamustine. However, B cell clonality could not be demonstrated, making these findings concerning for Castleman disease.
Results
Human herpesvirus 8 (HHV-8) testing performed on the inguinal lymph node sample came out positive, and he was diagnosed with HHV-8 positive multicentric Castleman disease and continued on weekly rituximab. He demonstrated an excellent response with complete resolution of rash, palpable lymphadenopathy and anemia after 4 cycles of treatment.
Discussion
Castleman disease (CD) is a rare disorder of polyclonal B cell proliferation classically presenting as lymphadenopathy with constitutional symptoms. Cutaneous presentations include eruptive angiomas or petechial rash but can be variable. Intrinsic or viral IL-6 play a key role in the pathogenesis of the disease. CD can be localised or multicentric (related to HHV-8 +/- HIV or idiopathic), and these subtypes differ in prognosis and management, with HIV and HHV-8 co-positivity indicating worse outcomes. While human IL-6 in unicentric and idiopathic multicentric disease respond well to IL-6 receptor antagonists, viral IL-6 in HHV-8 associated cases has a limited response. This is the rationale for preferring anti-CD20 therapy with rituximab in these patients.
Conculsions
Correct biopsy specimen, keen analysis of distinct pathologic features, and HHV-8 testing on tissue sample guide the diagnosis as HHV-8 serology can be falsely negative.
A Single Center Experience of Immune Related Adverse Events From Immune Checkpoint Inhibitors and an Attempt to Identify Populations at High Risk
INTRODUCTION: American Society of Clinical Oncology (ASCO) has developed guidelines on the management of immune-related adverse events (irAEs) associated with immune checkpoint inhibitors (ICPIs). However, many irAEs are under-reported and the studies to investigate predictive factors are limited with variable results.
METHODS: A total of 66 patients who received ICPIs at Stratton VAMC Albany between January 2015 to December 2018 were studied. Computerized Patient Record System (CPRS) was used to do a retrospective chart review to identify irAEs and related parameters. IRB approval was obtained.
RESULTS: Sixty-three patients received PD-1 inhibitors (62 males). Our study included 39 patients with lung, 10 renal, 6 head and neck, 4 skin (melanoma), and 2 bladder cancers, and 1 metastatic cancer with unknown primary. Median age of patients with irAEs was 69.5 years versus 66.7 years for patients without irAEs. 23 (36.5%) patients experienced 28 irAEs. 45 patients received nivolumab, 18 (40%) of which had 21 irAEs. 17 got pembrolizumab and 5 (35.2%) had 7 irAEs. Majority of the irAEs were grade I (n=10, 35.7%) or grade II (n=11, 39.2%), while 6 (21.4%) grade III and only 1 (3.5%) grade IV irAE was observed. Median time to appearance of irAEs was 2 cycles. Immunotherapy was continued in 12, temporarily held in 7 and permanently discontinued only in 4 patients. No death was attributed to irAEs. Six patients developed diarrhea, 4 hepatitis, 6 skin rash, 5 thyroid issues and 3 pneumonitis. Rare irAEs included cardiac tamponade (grade IV), uveitis (grade II), central adrenal insufficiency and mild neutropenia in one patient each. 2 patients had pre-existing autoimmune conditions (rheumatoid arthritis and chronic dermatitis), both had transient flares though immunotherapy was continued. Of note, only 3 patients received PDL-1 inhibitors and 1 developed grade II polymyalgia rheumatica and hypothyroidism.
Using multivariate logistic regression, we found no significant association between irAEs and age, body mass index, derived neutrophil to lymphocyte ratio, chronic kidney disease or environmental/medical allergies.
CONCLUSIONS: ICPIs were generally well tolerated in our population, though prompt recognition of rare and severe irAEs is essential. Larger studies are needed to investigate the predictive risk factors for irAEs.
INTRODUCTION: American Society of Clinical Oncology (ASCO) has developed guidelines on the management of immune-related adverse events (irAEs) associated with immune checkpoint inhibitors (ICPIs). However, many irAEs are under-reported and the studies to investigate predictive factors are limited with variable results.
METHODS: A total of 66 patients who received ICPIs at Stratton VAMC Albany between January 2015 to December 2018 were studied. Computerized Patient Record System (CPRS) was used to do a retrospective chart review to identify irAEs and related parameters. IRB approval was obtained.
RESULTS: Sixty-three patients received PD-1 inhibitors (62 males). Our study included 39 patients with lung, 10 renal, 6 head and neck, 4 skin (melanoma), and 2 bladder cancers, and 1 metastatic cancer with unknown primary. Median age of patients with irAEs was 69.5 years versus 66.7 years for patients without irAEs. 23 (36.5%) patients experienced 28 irAEs. 45 patients received nivolumab, 18 (40%) of which had 21 irAEs. 17 got pembrolizumab and 5 (35.2%) had 7 irAEs. Majority of the irAEs were grade I (n=10, 35.7%) or grade II (n=11, 39.2%), while 6 (21.4%) grade III and only 1 (3.5%) grade IV irAE was observed. Median time to appearance of irAEs was 2 cycles. Immunotherapy was continued in 12, temporarily held in 7 and permanently discontinued only in 4 patients. No death was attributed to irAEs. Six patients developed diarrhea, 4 hepatitis, 6 skin rash, 5 thyroid issues and 3 pneumonitis. Rare irAEs included cardiac tamponade (grade IV), uveitis (grade II), central adrenal insufficiency and mild neutropenia in one patient each. 2 patients had pre-existing autoimmune conditions (rheumatoid arthritis and chronic dermatitis), both had transient flares though immunotherapy was continued. Of note, only 3 patients received PDL-1 inhibitors and 1 developed grade II polymyalgia rheumatica and hypothyroidism.
Using multivariate logistic regression, we found no significant association between irAEs and age, body mass index, derived neutrophil to lymphocyte ratio, chronic kidney disease or environmental/medical allergies.
CONCLUSIONS: ICPIs were generally well tolerated in our population, though prompt recognition of rare and severe irAEs is essential. Larger studies are needed to investigate the predictive risk factors for irAEs.
INTRODUCTION: American Society of Clinical Oncology (ASCO) has developed guidelines on the management of immune-related adverse events (irAEs) associated with immune checkpoint inhibitors (ICPIs). However, many irAEs are under-reported and the studies to investigate predictive factors are limited with variable results.
METHODS: A total of 66 patients who received ICPIs at Stratton VAMC Albany between January 2015 to December 2018 were studied. Computerized Patient Record System (CPRS) was used to do a retrospective chart review to identify irAEs and related parameters. IRB approval was obtained.
RESULTS: Sixty-three patients received PD-1 inhibitors (62 males). Our study included 39 patients with lung, 10 renal, 6 head and neck, 4 skin (melanoma), and 2 bladder cancers, and 1 metastatic cancer with unknown primary. Median age of patients with irAEs was 69.5 years versus 66.7 years for patients without irAEs. 23 (36.5%) patients experienced 28 irAEs. 45 patients received nivolumab, 18 (40%) of which had 21 irAEs. 17 got pembrolizumab and 5 (35.2%) had 7 irAEs. Majority of the irAEs were grade I (n=10, 35.7%) or grade II (n=11, 39.2%), while 6 (21.4%) grade III and only 1 (3.5%) grade IV irAE was observed. Median time to appearance of irAEs was 2 cycles. Immunotherapy was continued in 12, temporarily held in 7 and permanently discontinued only in 4 patients. No death was attributed to irAEs. Six patients developed diarrhea, 4 hepatitis, 6 skin rash, 5 thyroid issues and 3 pneumonitis. Rare irAEs included cardiac tamponade (grade IV), uveitis (grade II), central adrenal insufficiency and mild neutropenia in one patient each. 2 patients had pre-existing autoimmune conditions (rheumatoid arthritis and chronic dermatitis), both had transient flares though immunotherapy was continued. Of note, only 3 patients received PDL-1 inhibitors and 1 developed grade II polymyalgia rheumatica and hypothyroidism.
Using multivariate logistic regression, we found no significant association between irAEs and age, body mass index, derived neutrophil to lymphocyte ratio, chronic kidney disease or environmental/medical allergies.
CONCLUSIONS: ICPIs were generally well tolerated in our population, though prompt recognition of rare and severe irAEs is essential. Larger studies are needed to investigate the predictive risk factors for irAEs.