On the necessity for postchemotherapy surgery for residual abdominal masses in metastatic nonseminomatous germ cell tumors (NSGCT) of testis
5088 Background: Residual abdominal masses after chemotherapy for metastatic NSGCT of testis may contain viable tumor-derived tissue which can be a nidus for relapse of disease, particularly when the tissue is frankly malignant. This justifies routine retroperitoneal lymph node dissection (RPLND) for large masses where malignant tissue is found at an appreciable rate. Yet RPLND is often carried out for smaller, or even absent, residual masses and differentiated teratoma (TD) is commonly found. There is little data on the consequence of leaving these smaller masses in situ, which is the practice in some units in the UK. Methods: 51 patients were identified from the MRC patients entered into the TE20 trial of 3 vs 4 cycles of BEP for good prognosis metastatic NSGCT who fell into the following category: metastatic NSGCT, residual abdominal mass only, unresected post-chemotherapy, response evaluation: CR or PR marker -ve. Collaborators were asked to report on mass size, relapse status, whether an operation was ever performed and the latest CT appearance. Results: 51/51 responses were received. Follow-up from the end of chemotherapy was >3years in all but two cases and the median was 5 years. When later surgery was carried out, for persistence or enlargement of the masses, the specimens contained TD with or without necrosis. One patient suffered a relapse one year after the surgery which took place 4.5 years after chemotherapy. Of the 41 patients who did not undergo surgery, 37 were considered on subsequent CTs to have normal appearances without further treatment. Conclusions: For patients with small residual masses in good prognosis metastatic disease no short or medium term benefit from routine surgery would have been seen. Its role in this situation is therefore questionable. For larger (>14mm) masses the need for routine surgery merits further study. [Table: see text] No significant financial relationships to disclose.