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Cancer. 2006 Oct 1;107(7):1511-9.

Lysophosphatidic acid acyltransferase-beta (LPAAT-beta) is highly expressed in advanced ovarian cancer and is associated with aggressive histology and poor survival.

Author information

1
Gynecologic Medical Oncology Service, Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, New York, USA.

Abstract

BACKGROUND:

Lysophosphatidic acid acyltransferase-beta (LPAAT-beta) tumor expression is an emerging prognostic, diagnostic, and therapeutic target in early epithelial ovarian cancer (EOC). The significance of tumor overexpression of LPAAT-beta was investigated in a large number of advanced- and early-stage EOC patients.

METHODS:

LPAAT-beta expression was analyzed by immunohistochemistry (IHC) in 158 ovarian tumors, including 68 advanced and 90 low-stage tumors, representing all grades and histologies (including 33 borderline tumors). In advanced-stage patients, tissue from multiple sites was evaluated to assess differential expression of LPAAT-beta in local tumor and distant metastases.

RESULTS:

LPAAT-beta was overexpressed in 90 (57%) of all 158 ovarian tumors. Forty-nine (72%) of 68 advanced tumors overexpressed LPAAT-beta. LPAAT-beta was associated with the presence of carcinoma versus borderline histology (67% vs. 18%, P < .0001), high histologic grade [according to the Silverberg Grading Scheme] (Grade 1, 25%; Grade 2, 21%; and Grade 3, 54%; P < .0001), and with papillary-serous histology. In an analysis of the 125 carcinoma patients, LPAAT-beta increased with but was not significantly associated with advanced clinical stage (P = .1431). LPAAT-beta expression was associated with shortened progression-free survival (PFS) (5-year PFS, 32% for LPAAT-beta-positive vs. 60% for LPAAT-beta-negative; P = .0318) and decreased overall survival (OS) (5-year OS, 54% for LPAAT-beta-positive vs. 74% for LPAAT-beta-negative; P = .0173).

CONCLUSIONS:

LPAAT-beta is highly expressed in advanced ovarian tumors and is associated with aggressive histology and decreased PFS and OS. LPAAT-beta is an intriguing prognostic tool for the identification of high-risk EOC and a potential target for directed therapy that warrants further study.

PMID:
16944535
DOI:
10.1002/cncr.22184
[Indexed for MEDLINE]
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