EFFICACY AND SAFETY PROFILE OF GEMCITABINE IN NON-SMALL-CELL LUNG-CANCER - A PHASE-II STUDY

Purpose: The aim of this study was to evaluate the efficacy and toxicity of gemcitabine at higher doses than had been used previously in patients with non-small-cell lung cancer (NSCLC). Patients and Methods: Eighty-four patients (65 men, 19 women; age range, 35 to 75 years; mean age, 59 years) with locally advanced or metastatic pathologically documented NSCLC were enrolled. Patients had bidimensionally measurable disease, as defined by computed tomographic (CT) scan or chest x-ray. A total of 28.6% had previously been surgically treated, while 9.5% had received radiotherapy. Fifty-three patients commenced at a dose of 1,000 mg/m2, and 31 at a dose of 1,250 mg/m2. Patients were to receive two dose escalations of 25%, provided that overall toxicity was no worse than World Health Organization (WHO) grade 1 or WHO grade 0 for platelets. Responding patients were reviewed and validated by a blinded oncology review board (ORB) of experts not involved with the study. Of the original 84 patients enrolled, 76 were assessable. Results: The overall response rate was 20% (95% confidence interval [CI], 11.6% to 30.8%). There were two complete responses (3%) and 13 partial responses (17%). Hematologic toxicity was negligible. WHO grade 3 WBC toxicity occurred in 0.9% of doses and WHO grade 4 in 0.1%. WHO grade 3 and 4 thrombocytopenia occurred in 0.1% and 0.1% of all doses, respectively. Nonhematologic toxicity was minor and easily controlled. Common side effects included peripheral edema, asthenia, and transient malaise. Conclusion: The single-agent efficacy of gemcitabine is equivalent to other agents commonly used to treat NSCLC. Gemcitabine has an unusually mild side effect profile for such an active agent. The nausea and vomiting experienced with gemcitabine are mild and generally well controlled with standard antiemetics; 5-HT3 receptor antagonists are typically not required. The use of gemcitabine does not cause significant alopecia, and hematologic toxicity is modest and unlikely to require hospitalization. Gemcitabine may have a role as monotherapy in patients with inoperable NSCLC.