Vinorelbine (Navelbine), cisplatin, and concomitant radiation therapy for advanced malignancies of the chest: a Phase I study.
Most patients with advanced solid tumors of the chest will have local and/or distant disease progression despite standard therapy. Vinorelbine (Navelbine; Burroughs Wellcome Co, Research Triangle Park, NC; Pierre Fabre Medicament, Paris, France) is a new semisynthetic vinca alkaloid with single-agent activity in lung cancer that recently also has been shown to act as a radiosensitizer in vitro. This study aims to define the maximum tolerated dose and dose-limiting toxicity when vinorelbine is given with cisplatin and concomitant radiation therapy. To date, 25 patients with advanced malignancies of the chest have been treated in a dose-escalation trial of vinorelbine administered once weekly with cisplatin (100 mg/m2 every 21 days) and concomitant thoracic radiation therapy (2 Gy/d x 30 fractions for 60 Gy). Vinorelbine was initially given at 20 and 25 mg/m2/wk. Acute dose-limiting toxicity was myelosuppression, which was seen at a vinorelbine dose of 25/mg/m2/wk, with grade 4 neutropenia in two of three patients and one treatment-related death from neutropenic sepsis. At vinorelbine 20/mg/m2/wk, no acute dose-limiting toxicity was seen, but grade 3 or 4 esophagitis developed in three of six patients near the end or after completion of radiation therapy. We subsequently decreased the administration of vinorelbine to weeks 1, 2, 4, and 5. Tolerance appears to be greater with this schedule; however, severe or life-threatening esophagitis at the completion of therapy continues to be observed. Given these preliminary results, it appears feasible to treat patients with advanced chest malignancies with concomitant cisplatin, vinorelbine, and radiation therapy. The significant dose reduction of vinorelbine that is necessary with concomitant radiation therapy provides the first in vivo evidence of a strong radiosensitizing effect of vinorelbine. The schedule is currently being modified to reduce the incidence of esophagitis.
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