Phase II study of weekly cisplatin, etoposide and irinotecan (PE/CPT) for refractory relapsed small cell lung cancer (SCLC)

Abstract

7088 Background: There is no standard treatment for relapsed SCLC. Irinotecan and etoposide has been studied in several phase II trials as active agents for relapsed SCLC. We reported the efficacy and tolerability of irinotecan combined with weekly cisplatin and etoposide (PE) in patients (pts) with sensitive relapsed SCLC (Goto, et al. Br J Cancer 2005). Methods: We conducted a phase II study to evaluate the efficacy and toxicity of PE/CPT regimen in pts with refractory relapsed SCLC, who had relapsed within 8 weeks after completion of first-line therapy. Pts must have measurable or assessable disease, age of 75 years or younger, performance status of 0 to 2 (ECOG), and adequate organ function. PE/CPT regimen consisted of cisplatin 25 mg/m2 on day 1 at one-week intervals for 9 weeks (at least 6 weeks), etoposide 60 mg/m2 on days 1–3 on week 1, 3, 5, 7, 9 (at least on week 1, 3, 5), and irinotecan 90 mg/m2 on day 1 on weeks 2, 4, 6, 8 (at least on week 2, 4, 6). After day 1 on week 2, G-CSF was administered on days when cytotoxic drugs were not given. Results: From May 2000 to January 2005, 30 pts were enrolled in this study. Pt characteristics were median age 64 years (range 44–75); 23 male and 7 female; 3 LD and 27 ED. Prior chemotherapy included PE in 13 pts, cisplatin and irinotecan in 7, carboplatin and etoposide in 5, and others in 5. 23 pts (77%) completed 6 or more weeks of chemotherapy. 2 CR and 19 PR were observed and the overall response rate was 70% (95% CI 50.6–85.3%). Grade 3/4 neutropenia, anemia and thrombocytopenia were observed in 60%, 73% and 47%, respectively. Grade 3/4 diarrhea was observed in only 7%. Coclusions: PE/CPT regimen was active and well tolerated for refractory relapsed SCLC. No significant financial relationships to disclose.