Low Survival in Poor Prognosis Metastatic Germ Cell Cancer in Belarus

Abstract

PURPOSE Since the development of the International Germ Cell Cancer Collaborative Group (IGCCCG) risk classification in a 1997 study, high-income countries have reported a significant increase in survival for poor prognosis patients. There are scant data on IGCCCG risk-stratified survival from low- and middle-income countries. We assessed the progression-free survival (PFS) and overall survival (OS) rates in a contemporary cohort of Belarusian patients with advanced germ cell cancer (GCC) stratified by the IGCCCG prognostic classification and analyzed prognostic factors for survival. MATERIALS AND METHODS The consecutive cohort of patients with clinical stage IIb-III testicular GCC or extragonadal germ cell tumors who received treatment or consultation in our two centers between 2010 and 2015 was included. All patients underwent primary chemotherapy. The patients were divided into seminoma and nonseminomatous germ cell carcinoma (NSGCC) subgroups. The Kaplan-Meier method was used to estimate 5-year PFS and OS. RESULTS This study included 111 patients with a median age of 32 years, 95% of whom were diagnosed with testicular cancer. Seminoma and NSGCC were identified in 32 (29%) and 79 (71%) patients, respectively. The median follow-up was 6.1 years. The 5-year PFS and OS rates for the entire cohort were 70% and 77%, respectively. In patients with good prognosis seminoma and good, intermediate, and poor prognosis NSGCC, the estimated PFS rates were 76%, 88%, 74%, and 39% and those for OS were 83%, 97%, 83%, and 38%, respectively. CONCLUSION In our cohort of Belarusian patients with advanced germ cell tumors, we failed to demonstrate an improvement in PFS and OS compared with the 1997 IGCCCG study. Moreover, survival in poor prognosis group is inferior to that in IGCCCG and all contemporary series from high-income countries.