Failure of low-dose, total-body irradiation to augment combination chemotherapy in extensive-stage small cell carcinoma of the lung.

In a pilot study, 21 consecutive eligible patients with extensive-stage small cell carcinoma of the lung were scheduled for treatment with combination chemotherapy followed by total-body irradiation (TBI), prophylactic cranial irradiation, and consolidative chemotherapy. Induction chemotherapy consisted of VP16-213, vincristine, cyclophosphamide, and doxorubicin (VOCA). TBI was given as 100 rads in 10 fractions over 2 wk. Consolidation chemotherapy consisted of cyclophosphamide, methotrexate, and hexamethylmelamine (CMH). VOCA chemotherapy was well tolerated, with a 79% response rate in 19 evaluable patients. TBI was successfully given after four cycles of VOCA without excessive morbidity in 11 patients, although subsequent CMH chemotherapy in 8 patients has required dose reductions and some delays in therapy. Unfortunately, TBI did not increase the degree of response, and 2 patients relapsed during this therapy. Median survival in this study was 40-44 wk. One patient has survived 78 wk and remains in remission. TBI can be safely given following induction chemotherapy in extensive-stage small cell carcinoma of the lung, but it does not appear to add to the therapeutic benefit of combination chemotherapy alone.

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