Involution of PTEN-null endometrial glands with progestin therapy

Wenxin Zheng, Heather E. Baker, George L. Mutter

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


Objectives. Loss of PTEN tumor suppressor gene function characterizes most (63%) endometrial precancerous lesions (endometrial intraepithelial neoplasia, EIN) and up to 83% of endometrioid endometrial cancers. Because systemic progestins are known to promote involution of precancerous endometrial lesions, we tested the hypothesis that this therapy preferentially leads to clearance of immunohistochemically detected PTEN-null endometrial glands in a variety of histopathologic settings. Methods. PTEN immunohistochemistry of pre and postprogestin-treated endometria was successfully performed on 17 women presenting with an intake endometrial biopsy diagnosis of " hyperplasia". Intake biopsies were rediagnosed using EIN criteria as 5 normal (proliferative or secretory), 4 anovulatory, 3 polyps, and 5 EIN endometria. The persistence of PTEN-null glands in progestin-treated patients was compared to that seen previously in rebiopsied normal proliferative endometrium of endogenously cycling premenopausal women. Results. Ten of 17 women prehormonal therapy had PTEN-null glands in the initial biopsy, and 90% (9/10) of these disappeared in the postprogestin sample. This contrasts with only 17% (2/12) involution in the endometria of normal cycling women (Fishers exact test P = 0.002, Odds Ratio 45). Conclusions. We conclude that progestin therapy promotes involution, or disappearance, of PTEN-null endometrial glands relative to the persistence rate seen for normal cycling women. This effect occurs among PTEN-null glands having a variety of histopathologic presentations.

Original languageEnglish (US)
Pages (from-to)1008-1013
Number of pages6
JournalGynecologic oncology
Issue number3
StatePublished - Mar 2004


  • EIN
  • Endometrial hyperplasia
  • PTEN
  • Progesterone

ASJC Scopus subject areas

  • Oncology
  • Obstetrics and Gynecology


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