[Chemotherapy of small cell bronchial cancers. Prognostic importance of complete response (1,280 patients). Groupe Petites Cellules]

Pretherapeutic prognostic factors for patients given chemotherapy for small cell lung carcinoma have been widely studied. We evaluated response to chemotherapy in patients included in 4 multicentric trials with less restrictive entry criteria in order to determine the contribution of clinical outcome as a predictive factor.Pretherapeutic and therapeutic prognostic factors were assessed in 1280 patients included in 4 successive multicentric therapeutic trials on chemotherapy for small cell lung carcinoma conducted from January 1, 1983 to April 1, 1992. Logrank test for univariate analysis and Cox's stepwise method for multivariate analysis were used to evaluate the results.Univariate analysis identified pretherapeutic factors as significant for prognosis: Karnofsky index (p0.0001), alkaline phosphatase level (p0.0002), white cell count (p0.0005), age (p = 0.0007), presence of brain metastasis (p = 0.0004), presence of liver metastasis (p = 0.03), initial extension (p = 0.04). Multivariate analysis taking into account pretherapeutic and therapeutic factors demonstrated that complete response after the second and after the sixth treatment session were predictive of longer survival (p = 0.0001). This factor was more powerful than all the pretherapeutic factors including the Karnofsky index, initial extension and brain metastasis.For patients with small cell lung carcinoma, the prognostic value of early response to chemotherapy suggests that high-doses should be used starting at the first session.