Expression and prognostic significance of O6-methylguanine-DNA methyltransferase in hepatocellular, gastric, and breast cancers

Shiroh Matsukura, Kohji Miyazaki, Hiroyuki Yakushiji, Akiomi Ogawa, Katsumi Harimaya, Yusaku Nakabeppu, Mutsuo Sekiguchi

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


Background: O6-Methylguanine-DNA methyltransferase (MGMT) is an enzyme that repairs O6-methylguanine, a promutagenic DNA base damaged by endogenous and environmental alkylating agents. There are few reports that describe whether or not abnormal MGMT expression correlates with the prognosis in human solid cancers. Methods: The expression of MGMT was immunohistochemically evaluated in 60, 62, 105, and 46 paraffin-embedded samples from patients with curatively resected hepatocellular, gastric, colorectal, and breast cancers, respectively. Results: The expression of MGMT was a positive predictive factor for overall survival in hepatocellular (P = .005) and gastric cancers (P < .001) and for relapse-free survival in breast cancers (P < .001). MGMT-positive gastric tumors (n = 42) were correlated with the absence of serosal invasion (P = .045), lymph node metastasis (P = .006), intestinal type (P = .018), and low pathological tumor, node, metastasis stage (P < .001). All breast tumors that recurred locally after operation were MGMT negative (P = .004). The clinicopathologic characteristics of colorectal cancers with respect to MGMT expression did not significantly differ. Conclusions: The expression of MGMT is a predictive prognostic marker in patients with hepatocellular, gastric, and breast cancers. These findings may help to establish therapeutic strategies for patients with these types of solid cancer.

Original languageEnglish
Pages (from-to)807-816
Number of pages10
JournalAnnals of Surgical Oncology
Issue number10
Publication statusPublished - 2001

All Science Journal Classification (ASJC) codes

  • Surgery
  • Oncology


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