To eliminate death by cancer, it would be necessary for us to register newly developed cancer in certain districts. We have registered all gynecologic malignant neoplasms in Shizuoka Prefecture, Japan, since October 1982 using a microcomputer. Analysis for one and a half years was performed as follows. Gynecologic malignancies are as detailed below: cervical cancer 304 cases, corpus cancer 58 cases, ovarian cancer 51 cases, vaginal cancer 4 cases, vulvar cancer 5 cases. A study of the correlation between detected malignancies and gynecologic examinations, particularly concerning cytologic check-up, revealed the importance of cytology in early cancer detection.