Study of Sequential Topoisomerase, Irinotecan/Oxaliplatin - Etoposide /Carboplatin in Extensive Small Cell Lung Cancer (SCLC)

This is a Phase II, open label study for either chemotherapy-naïve patients with extensive SCLC or patients who are refractory or have relapsed to 1st line therapy for SCLC. The primary objective is to determine the objective response rate. This study consists of 2 parts: Part I - Chemotherapy-naïve patients with extensive SCLC • These patients will be treated with sequential topoisomerase targeting regimens (Regimen A and B). Regimen A consists of irinotecan and oxaliplatin (IROX), given on Day 1, and Neulasta administered on Day 2. Regimen B consists of etoposide and carboplatin, given on Day 15(etoposide will be given daily x 3)and Neulasta on Day 18. Then, Regimen A will be given again 3 weeks later. The first re-evaluation for response will be performed 3 weeks after the second round of the sequential regimens. Schema of Part I: Regimen A (→ 2 weeks) Regimen B (→ 3 weeks) Regimen A (→ 2 weeks) Regimen B → (3 weeks) → Re-Stage * The second re-evaluation for response will be performed 3 weeks after the fourth round of the sequential regimen. At this point patients with stable disease will be observed; those with either a partial or complete response will be treated with another round of sequential therapy (Regimen A → Regimen B) if there is no evidence of unacceptable toxicity. At the end (3 weeks after) of the fifth round of chemotherapy, patients will be re-evaluated for response, and will be followed-up for recurrent disease every 8 weeks. * Analysis of Top I and Top II levels in peripheral blood mononuclear cells will be performed in 10 patients of Part I. * Evaluation of the expression of the ERCC genes (ERCC1, ERCC2, and XPF) will be performed in those patients in Part I with an adequate tumor specimen. Part II - Patients who have either refractory disease or have relapsed from 1st line therapy • These patients will be treated with Regimen A1 (IROX) at 3-week intervals. Neulasta will be administered on Day 2 of each cycle. The first re-evaluation for response will be performed 3 weeks after the 3rd cycle of Regimen A1. The second re-evaluation for response will be performed 3 weeks after the 6th cycle of Regimen A1. At this point, patients with stable disease will be observed; those with either a partial or complete response will be treated with two additional cycles of Regimen A1 if there is no evidence of unacceptable toxicity. At the end (3 weeks after) of the 8th cycle of Regimen A1, patients will be re-evaluated for response, and will be followed-up for recurrent disease every 8 weeks. Schema of Part II: Regimen A1 (→ 3 weeks) Regimen A1 (→ 3 weeks) Regimen A1 (→ 3 weeks) Re-Stage