Abstract
Background
Mucosal melanoma is a rare and aggressive malignancy with poorer response compared with cutaneous melanoma. Prospective trials of immune checkpoint inhibitors in unresectable or metastatic mucosal melanoma have not been reported.
Purpose
This phase II trial assessed the efficacy and safety of nivolumab monotherapy for unresectable or metastatic mucosal melanoma.
Patients and methods
Eligibility criteria were as follows: histological diagnosis of unresectable or metastatic mucosal melanoma; age ≥ 20 years; ECOG performance status 0 or 1; and with measurable lesions. Patients received nivolumab 2 mg/kg every 3 weeks. The primary endpoint was the response rate (RR) according to Response Evaluation Criteria in Solid Tumors version 1.1. The secondary endpoints were overall survival, progression-free survival, disease control rate, and toxicity.
Results
Twenty patients were enrolled between December 2014 and July 2017. Two patients without measurable lesions and one patient with uveal melanoma were excluded from analysis of efficacy. The best overall RR was 23.5%. One patient achieved a complete response, three partial response, and five stable disease as their best response. The median progression-free survival was 1.4 months (95% CI 1.2–2.8). The median overall survival was 12.0 months (95% CI 3.5 to not reached). The 1-year overall survival was 50.0% (95% CI 25.9–70.0%). Treatment-related adverse events of grades 3 or 4 occurred in 15% (3/20) of the patients. Grade 3 adverse events were resolved by corticosteroid treatment.
Conclusion
Although this trial met the primary endpoint, the RR was still unsatisfactory. Therefore, further treatment development is required.
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Acknowledgements
We thank the patients and their families who participated in the trial.
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Conflict of interest
Motoo Nomura, Isao Oze, Toshiki Masuishi, Tomoya Yokota, Ken Kato, and Masashi Andoh have conflicts of interest to declare and have financial disclosures or funding support. Shunichiro Iwasawa reports grants and lecture fees from ONO PHARMACEUTICAL CO., LTD., and lecture fees from Bristol-Myers Squibb K.K. Hironaga Satake received honoraria from Bayer, Bristol-Myers Squibb, Chugai Pharma, Daiichi Sankyo, Eli Lilly Japan, Merck Bio Pharma, MSD, Ono Pharmaceutical, Sanofi, Taiho Pharmaceutical, Takeda, and Yakult Honsha.
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Nomura, M., Oze, I., Masuishi, T. et al. Multicenter prospective phase II trial of nivolumab in patients with unresectable or metastatic mucosal melanoma. Int J Clin Oncol 25, 972–977 (2020). https://doi.org/10.1007/s10147-020-01618-9
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DOI: https://doi.org/10.1007/s10147-020-01618-9