To evaluate the immunological significance for regional lymph node histology in uterine cervical cancer, 1,144 lymph nodes of 153 cases were studied. Four histological findings in lymph nodes as follows were evaluated: Paracortical Area (PA), Sinus Histiocytosis (SH), Germinal Center (GC) and Degenerative Changes (DC). PA was well developed in early cancer, while hypoplastic in advanced cancer. SH appeared in early stages and disappeared gradually as cancer progressed. GC was most hyperplastic in stage I b and hypoplastic in stage I a and III. DC was remarkable in advanced cancer. The findings of PA of the regional lymph nodes in the cases without metastasis, and those of PA, GC and DC of the metastatic lymph nodes in the cases with metastasis were well correlated with prognosis. These results indicate that investigation of the histology of lymph nodes draining uterine cervical cancer may give valuable information to evaluate the immune response of the patients and to predict their prognosis.