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The Significance of Mismatch Repair Deficiency in Young Patients With Endometrial Cancer.
Chu, Mandy Man-Yee; Liu, Stephanie Si; Tam, Kar-Fai; Ip, Philip Pun-Ching; Cheung, Annie Nga-Yin; Ngan, Hextan Yuen-Sheung.
Afiliação
  • Chu MM; Departments of Obstetrics and Gynecology (M.M.-Y.C., S.S.L., K.-F.T., H.Y.-S.N.) Pathology (P.P.-C.I., A.N.-Y.C.), The University of Hong Kong, Queen Mary Hospital, Hong Kong.
Int J Gynecol Pathol ; 34(5): 403-10, 2015 Sep.
Article em En | MEDLINE | ID: mdl-26262451
The objective of this study was to identify the tumor characteristics associated with mismatch repair deficiency in young patients with endometrial carcinoma. Young patients (45 yr old or younger) with endometrial carcinoma treated by hysterectomy in our institution between July 2001 and June 2009 were identified. The clinical and pathologic data were obtained by review of clinical records. Among the 122 cases identified, paraffin sections were available in 67 cases for immunohistochemical staining and frozen tissue available in 62 cases for microsatellite instability (MSI) analysis. Both paraffin sections and frozen tissue were available in 36 cases. Among the 67 cases with immunohistochemical staining, 22 (32.8%) showed loss of expression of at least 1 mismatch repair protein. Defective MLH1 or MSH2 expression was associated with poor prognostic factors, including a higher incidence of pelvic lymph nodes metastasis (P=0.018) and higher stage (P=0.022) for MLH1, and an increased risk of lymphovascular permeation (P=0.015) for MSH2. On the contrary, defective MSH6 protein expression was associated with a lower incidence of high-grade tumors (P=0.04). Among the 62 cases with MSI analysis, 12 (19.4%) tumors were classified as microsatellite-high (MSI-H), whereas 2 (3.2%) were classified as microsatellite-low (MSI-L). There was no difference in the pathologic characteristics between MSI-stable and MSI-H tumor. We concluded that defective mismatch repair expression is important in young patients with endometrial carcinoma, with MSH6 protein being most commonly affected. The phenotype resulting from defective MSH6 expression was different from that caused by MLH1 or MSH2 loss.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Síndromes Neoplásicas Hereditárias / Neoplasias Encefálicas / Neoplasias Colorretais / Neoplasias do Endométrio Tipo de estudo: Prognostic_studies Limite: Adult / Female / Humans / Middle aged Idioma: En Revista: Int J Gynecol Pathol Ano de publicação: 2015 Tipo de documento: Article País de afiliação: Hong Kong País de publicação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Síndromes Neoplásicas Hereditárias / Neoplasias Encefálicas / Neoplasias Colorretais / Neoplasias do Endométrio Tipo de estudo: Prognostic_studies Limite: Adult / Female / Humans / Middle aged Idioma: En Revista: Int J Gynecol Pathol Ano de publicação: 2015 Tipo de documento: Article País de afiliação: Hong Kong País de publicação: Estados Unidos