During the past ten years numerous new findings have been documented in the field of gynecological pathology, especially in respect of neoplasms. These findings have been generated by the application of recently developed techniques of immunology and molecular biology. However, clinicopathologic examinations. are still an absolute requirement for the morphologic evaluation of neoplasms, including gynecological tumors. The International Society of Gynecological Pathologists (ISGYP) has contributed greatly to the progress within gynecological pathology. The ISGYP Nomenclature Committee has promoted the International Histological Classification of Gynecological Tumors under the auspices of the W orid Health Organization. A new edition of the classification of tumors and tumor-like conditions of trophoblastic disease, uterine corpus, cervix, vagina, and vulva is currently in press. A second volume covering the ovaries, fallopian tubes, broad ligament, and female peritoneum will be published later. Organization of scientific symposia and seminars has also been an important activity of the ISGYP. The present editor organized and chaired a symposium entitled "Recent Progress in Diagnostic Pathology of Gynecological Tumors" held in Sendai, Japan on 11 April 1986 in close cooperation with Prof. T. Okagaki, University of Minnesota Medical School, and under the joint auspices ofthe ISGYP and the Japanese Society of Pathology. The following topics were discussed at this symposium: - Immunocytochemistry of gestational trophoblastic disease (Dr. R.J."