The Impact of Bleomycin on Retroperitoneal Histology at Post-Chemotherapy Retroperitoneal Lymph Node Dissection of Good Risk Germ Cell Tumors

Abstract

Induction chemotherapy for International Germ Cell Cancer Collaborative Group (IGCCCG) good risk metastatic testicular cancer includes 3 cycles of bleomycin, etoposide and cisplatin (BEP x3) or 4 cycles of etoposide and cisplatin (EP x4). We examine differences in active cancer in the retroperitoneum between patients receiving BEP x3 compared to EP x4. The Indiana University Testis Cancer database was queried to identify IGCCCG good risk patients who received BEP x3 or EP x4 induction chemotherapy before retroperitoneal lymph node dissection. The primary outcome of interest was retroperitoneal histology. The association between the use of bleomycin in the induction regimen with active cancer in the retroperitoneal specimen was tested using a propensity score adjusted analysis. A total of 179 men (79%) received BEP x3 while 47 (21%) received EP x4. Median age of the bleomycin, etoposide and cisplatin group was 27 years (range 15 to 50) vs 30 years (range 18 to 71) in the etoposide and cisplatin group. The incidence of active cancer in the retroperitoneal specimen at post-chemotherapy retroperitoneal lymph node dissection was significantly higher in the EP x4 group compared to the BEP x3 group (31.9% vs 7.8%, p <0.01). This significant difference in the bleomycin, etoposide and cisplatin vs etoposide and cisplatin groups remained in the propensity adjusted analysis (22.9% vs 7.8%, p=0.015). There was a higher incidence of active cancer in the retroperitoneal specimen in good risk patients who received 4 cycles of induction etoposide and cisplatin chemotherapy compared to 3 cycles of bleomycin, etoposide and cisplatin in this retrospective analysis. The overall burden of treatment may be higher for men receiving EP x4 for induction chemotherapy.