Survival outcomes of patients with metastatic germ cell tumor (mGCT) treated from 1998 to 2012: The Indiana University (IU) experience.

Abstract

491 Background: Patients with mGCT’s treated between 1975-1990 were classified by the International Germ Cell Cancer Collaborative Group (IGCCCG) into good, intermediate, and poor risk. This study attempts to identify prognostic factors in a contemporary cohort of patients with mGCT treated at IU. Methods: Retrospective analysis of all patients with GCT seen at IU from 1998-2012. 1,341 consecutive patients with mGCT were identified of whom 615 patients received initial chemotherapy at IU and were eligible for analysis. All patients in this cohort were treated with cisplatin-based combination chemotherapy. Kaplan-Meier methods were used for analysis of 5 year progression free survival (PFS) and overall survival (OS). Results: Median age was 29. Median follow up time 5 years. Good, intermediate, and poor risk disease had median AFP of 8, 1822, 291 and median hCG of 8, 5000, 12837 respectively. 89 (14%) patients had seminoma and 526 (86%) had non-seminomatous GCT (NSGCT). Primary site was testis/retroperitoneal in 565 (92%) and mediastinum in 48 (8%). The 5 year PFS and OS for patients with poor risk excluding primary mediastinal NSGCT (PMNSGCT) was 52% and 78% respectively. In contrast, 5 year PFS and OS for patients with PMNSGCT was 49% and 58% respectively. The results comparing outcomes of patients in IGCCCG versus patients at IU are depicted in the table below. Conclusions: In this contemporary retrospective dataset from Indiana University there was improvement in OS for men with poor risk mGCT, possibly due to improved salvage chemotherapy. Only patients with PMNSGCT continue to have poor outcomes and pose a therapeutic challenge due to lack of effective salvage therapy. [Table: see text]