title: Immunohistochemical evaluation of KIT expression in sarcomas of the gynecologic region.
abstract: KIT is expressed in most gastrointestinal stromal tumors, and they usually show c-kit aberrations (most frequently deletions or deletions coexisting with a single or multiple point mutations). Recently, several studies regarding KIT expression in gynecologic tumors have been reported; however, their outcomes were not consistent. In this study, we immunohistochemically examined KIT expression in sarcomas of the female genital tract and studied the existence of c-kit aberrations to elucidate the characteristics of KIT-positive tumors in the gynecologic region. Formalin-fixed, paraffin-embedded tissues from 25 surgically resected and 1 biopsy specimen from 26 patients were used. Histological diagnoses included 14 uterine leiomyosarcomas, 6 carcinosarcomas, 5 endometrial stromal sarcomas, and 1 vaginal epithelioid sarcoma. Immunohistochemical studies were performed using anti-KIT polyclonal antibody. Only four of the above tumors (15%) were positive for KIT, all of which were carcinosarcomas. Specific KIT immunoreactivity was observed in the only carcinomatous components in one case, in the only sarcomatous component in two cases, and in the both components in one case. However, none of the cases showed c-kit aberrations in exons 9, 11, 13, and 17. Judicious decision is mandatory before applying Imatinib therapy to KIT-positive gynecologic tumors.
authors.affiliation: Department of Pathology, Saitama Medical School, Saitama, Japan.
authors.forename: Masato
authors.initials: M
authors.lastname: Nakayama
authors.forename: Tomoko
authors.initials: T
authors.lastname: Mitsuhashi
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Shimizu
authors.forename: Shinichi
authors.initials: S
authors.lastname: Ban
authors.forename: Fumihiro
authors.initials: F
authors.lastname: Ogawa
authors.forename: Osamu
authors.initials: O
authors.lastname: Ishihara
authors.forename: Michio
authors.initials: M
authors.lastname: Shimizu
mesh_terms: D014408:Biomarkers, Tumor / Q000378:metabolism; D004252:DNA Mutational Analysis; D004273:DNA, Neoplasm / Q000032:analysis; D005260:Female; D005833:Genital Neoplasms, Female / Q000378:metabolism* / Q000473:pathology / Q000601:surgery; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods*; D009154:Mutation; D016133:Polymerase Chain Reaction; D019009:Proto-Oncogene Proteins c-kit / Q000378:metabolism*; D012509:Sarcoma / Q000378:metabolism* / Q000473:pathology / Q000601:surgery
chemical_list: D014408:Biomarkers, Tumor; D004273:DNA, Neoplasm; D019009:Proto-Oncogene Proteins c-kit