Expression and prognostic significance of O6-methylguanine-DNA methyltransferase in hepatocellular, gastric, and breast cancers.
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.
Matsukura
S
S
Department of Surgery, Saga Medical School, Japan.
Miyazaki
K
K
Yakushiji
H
H
Ogawa
A
A
Harimaya
K
K
Nakabeppu
Y
Y
Sekiguchi
M
M
D000368:Aged; D000704:Analysis of Variance; D001943:Breast Neoplasms / Q000201:enzymology*; D015179:Colorectal Neoplasms / Q000201:enzymology; D005260:Female; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D008113:Liver Neoplasms / Q000201:enzymology*; D008297:Male; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000032:analysis*; D019853:O(6)-Methylguanine-DNA Methyltransferase / Q000032:analysis*; D011379:Prognosis; D013274:Stomach Neoplasms / Q000201:enzymology*; D016019:Survival Analysis
D009363:Neoplasm Proteins; D019853:O(6)-Methylguanine-DNA Methyltransferase