Summary
Background: Treatment options for unresectable, locally advanced or metastatic penile squamous cell carcinoma (SCC) are limited. Previous studies have shown that 40–62% of patients with penile SCC express PD-L1. We report three cases of locally advanced or metastatic penile SCC treated with pembrolizumab. Case Presentations: Herein, we present three patients with recurrent, locally advanced or metastatic penile SCC who progressed on a platinum-based chemotherapy triplet and were treated with pembrolizumab, administered as part of a phase II clinical trial for rare tumors (NCT02721732). One patient with a microsatellite instability high (MSI-H) tumor experienced a durable partial response to pembrolizumab, underwent surgical consolidation, and remains disease-free 38.7 months later. Two patients experienced progressive disease within 3 months of beginning pembrolizumab. No one experienced a grade 3 or worse treatment-related adverse event. Conclusion: In sum, single-agent pembrolizumab was well tolerated as salvage therapy in a small cohort of patients with unresectable, locally advanced or metastatic penile SCC. Pembrolizumab produced an objective response in an MSI-H tumor, yet it did not control disease in two patients with MSS penile SCC. Rationale combination therapies, including pembrolizumab, warrant further investigation. Trial registration: ClinicalTrials.gov identifier: NCT02721732. Registered March 23, 2016.
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Data availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request and approval from the study sponsor according to available guidelines at the time of the request.
Abbreviations
- CGI:
-
Cisplatin, gemcitabine, ifosfamide
- CPS:
-
Combined positive score
- IHC:
-
Immunohistochemistry
- MDACC:
-
MD Anderson Cancer Center
- Mg:
-
Milligrams
- MMR-d:
-
Mismatch repair deficient
- MSI-H:
-
Microsatellite instability high
- MPS:
-
Modified proportion score
- NCCN:
-
National Comprehensive Cancer
- PD:
-
Progressive disease
- PD-1:
-
Programmed cell death protein 1
- PD-L1/PD-L2:
-
Programmed death-ligand 1 or 2
- PR:
-
Partial response
- SCC:
-
Squamous cell carcinoma
- SD:
-
Stable disease
- TIP:
-
Paciltaxel, ifosfamide, cisplatin
- TMB:
-
Tumor mutation burden
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Acknowledgements
The authors thank the patients and their families for participating in this clinical trial.
Funding
Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc. provided the study drug and funded the study. Support was also provided by the National Institutes of Health/National Cancer Institute under award number P30CA016672.
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Andrew W Hahn, Jad Chahoud, and Aung Naing wrote the initial draft of the manuscript. All authors meaningfully contributed to revisions and approved the final draft of the manuscript. Matthew T Campbell, Curtis A Pettaway, Jennifer Wang, Daniel D Karp, and Shu-Ming Tu participated in the care of the patients included in this case series. Aung Naing and Bettzy A. Stephen were responsible for the design and monitoring of the clinical trial.
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Ethics approval and consent to participate
The patients reported here participated in a clinical trial that was registered on ClinicalTrials.gov (NCT02721732). The trial protocol was approved by the US Food and Drug Administration and the institutional review board at MDACC. The study was conducted in accordance with the Declaration of Helsinki and the International Conference on Harmonization Good Clinical Practice guidelines. All study participants provided written informed consent before enrollment.
Research involving human participants
The patients reported here participated in a clinical trial that was registered on ClinicalTrials.gov (NCT02721732). The trial protocol was approved by the US Food and Drug Administration and the institutional review board at MDACC. All procedures performed in studies of human subjects were in accordance with the ethical standards of the institutional review board and with the Declaration of Helsinki and the International Conference on Harmonization Good Clinical Practice guidelines.
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All study participants provided written informed consent before enrollment.
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Individual patient consent for publication is not necessary because this case series does not include identifying data.
Competing interests
Andrew W. Hahn, Jad Chahoud, Jennifer Wang, and Bettzy A. Stephen have no conflicts to disclose.
Matthew T. Campbell reports consulting/honorarium: Eisai, Exelixis, EMD Serono, Pfizer, AstraZeneca, Seattle Genetics, research grant funding: Exelixis, Pfizer, EMD Serono, ApricityHealth, Janssen.
Curtis A. Pettaway reports consulting to Wolters Kluwer for “UpToDate series.”
Aung Naing reports consulting to CytomX Therapeutics, Novartis, Kymab, Genome, OncoSec KEYNOTE-695, and STCube Pharmaceuticals. He reports travel and accommodation expenses from ARMO BioSciences. He reports research funding to his institution from NCI, EMD Serono, MedImmune, Healios Onc. Nutrition, Atterocor, Amplimmune, ARMO BioSciences, Eli Lilly, Karyopharm Therapeutics, Incyte, Novartis, Regeneron, Merck, Bristol Myers Squibb, Pfizer, CytomX Therapeutics, Neon Therapeutics, Calithera Biosciences, TopAlliance Biosciences, Kymab, PsiOxus, Arcus Biosciences, NeoImmuneTech, ImmuneOncia, and Surface Oncology. Spouse reports research funding to her institution from Immune Deficiency Foundation Jeffery Modell Foundation and chao physician-scientist, and Baxalta; and is on the advisory board of Takeda, CSL, Behring, Horizon, and Pharming.
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Hahn, A.W., Chahoud, J., Campbell, M.T. et al. Pembrolizumab for advanced penile cancer: a case series from a phase II basket trial. Invest New Drugs 39, 1405–1410 (2021). https://doi.org/10.1007/s10637-021-01100-x
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DOI: https://doi.org/10.1007/s10637-021-01100-x