Cisplatin, dacarbazine and vinblastine as first line chemotherapy for liver metastatic uveal melanoma in the era of immunotherapy: a single institution phase II study

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No standard therapy is established for metastatic uveal melanoma. Liver involvement in uveal melanoma may lead to organ impairment, which represents a common cause of death. Tumor shrinkage might improve survival by delaying hepatic failure. Since the combination of cisplatin, vinblastine, dacarbazine allowed a high response rate in metastatic cutaneous melanoma, we explored efficacy and safety of this regimen in unresectable liver metastases of uveal melanoma. In the present phase II study we administered intravenously cisplatin (80 mg/mq, day 1), dacarbazine (250 mg/mq/day, days 1–3), vinblastine (2 mg maximum, day 1) every 21 days as first line treatment for patients with unresectable metastases of uveal melanoma and BRAF wild type. Primary endpoint was objective response rate; overall survival (OS), progression-free survival and toxicity were secondary endpoints. Partial responses were observed in five (20%) patients, stable disease in 12 (48%) patients; disease control rate was 68%. Median OS of all the patients was 13 months, median progression free survival was 5.5 months. OS of responding patients was 21 months; OS of patients with disease control was 18 months, significantly longer than survival of progressing patients (7 months, P=0.0003). Five (20%) patients experienced grade 3–4 toxicity. Combination of cisplatin, vinblastine and dacarbazine was feasible and demonstrate both an interesting objective response rate and a survival benefit for patients achieving a disease control. This regimen could be considered for patients with good performance status and unresectable liver limited disease.

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