A Phase II Pilot Trial of Concurrent Biochemotherapy with Cisplatin, Vinblastine, Dacarbazine, Interleukin 2, and Interferon α-2B in Patients with Metastatic Melanoma

Abstract

In an effort to develop a biochemotherapy regimen for metastatic melanoma suitable for testing in a cooperative group setting, we modified the concurrent biochemotherapy regimen of S. S. Legha et al. (J. Clin. Oncol., 16: 1752–1759, 1998) by providing enhanced supportive care and developing a strict, conservative approach to the management of treatment-related toxicities. Patients received cisplatin, vinblastine, and dacarbazine (CVD: cisplatin (20 mg/m²) and vinblastine (1.2 mg/m²) on days 1–4, dacarbazine (800 mg/m²) on day 1 only) concurrently with interleukin 2 (9 MIU/m²/day) by continuous i.v. infusion on days 1–4 and IFN-α (5 MU/m²/day) on days 1–5, 8, 10, and 12. Prophylactic antibiotics and a maximum of four cycles were administered. Routine granulocyte colony-stimulating factor and aggressive antiemetics were initiated after patients 7 and 14, respectively. Forty-four patients were enrolled in this study. No patients had received prior chemotherapy or interleukin 2; however, 23 (53%) had received prior IFN-α, mostly in the adjuvant setting. A total of 131 treatment cycles was administered. Significant toxicities requiring dose modification included: hypotension requiring pressors (15 episodes in 11 patients), grades 3/4 vomiting (12 episodes in 15 cycles; 5 episodes in 12 patients (6 episodes in 9 cycles after initiation of the modified antiemetic regimen), transient renal insufficiency (5 episodes in 5 patients), grade 4 thrombocytopenia (24 episodes, 1 associated with bleeding), neutropenia with or without fever (15 instances, only 11 in 112 cycles after routine use of granulocyte colony-stimulating factor), and catheter-related bacteremia (2 patients). Five (16%) of 30 patients who were treated after the last protocol modification experienced what we defined as unacceptable toxicity for a cooperative group setting. Responses were seen in 19 of 40 evaluable patients (relative risk, 48%) with 8 complete responses (20%). The median response duration was 7 months (range, 1–17+ months) with one currently ongoing. The central nervous system was the initial site of relapse in 11 responding patients. The median survival duration was 11 months (range, 2–31 months). This modified, concurrent biochemotherapy regimen is active and tolerable for use in a cooperative group setting. Central nervous system relapse, however, remains a concern for responders. This regimen is being compared with CVD in a Phase III Intergroup Trial (Eastern Cooperative Oncology Group/Southwest Oncology Group 3695).