Inguinal lymph node metastases from adenocarcinoma of the rectum.

This study is a retrospective review of 18 patients treated from 1964 to 1990 with inguinal lymph node metastases from rectal adenocarcinoma. Statistical analyses were performed to determine the effects of sex, disease-free interval, extent of inguinal lymph node metastases, and the presence of extranodal disease upon survival. The mean age of patients was 61 years (range 32 to 87). Lymph node metastases were unilateral in 12 patients and bilateral in 6. All 18 patients developed disease at loco-regional sites (pelvis/perineum) either synchronous or metachronous to their development of inguinal lymph node metastases. Survival from the time of diagnosis of inguinal lymph node metastases ranged from 2 to 54 months (median 13.5). There was no statistically significant difference in survival for unilateral versus bilateral inguinal metastases (P = 0.37). The median survival when inguinal lymph node metastases occurred > or = 12 months from diagnosis of the primary tumor was 16 months and 10.5 months when metastases occurred < 12 months after the diagnosis of the primary tumor (P = 0.033). The median survival for patients with isolated metachronous inguinal lymph node metastases was 20 months versus 12 months for patients who developed metachronous inguinal metastases concurrent with other areas of disease (P = 0.045). Although patients with disease-free intervals > or = 12 months and those with isolated inguinal metastases had statistically significant longer median survivals, the overall survival remains poor and all patients died with disease.