Erschienen in:
01.11.2004 | Original Contributions
Cyclooxygenase-2 Overexpression Is Related to Polypoid Growth and K-ras Gene Mutation in T1 Colorectal Carcinomas
verfasst von:
Takuya Okawa, M.D., Keigo Yoshinaga, M.D., Hiroyuki Uetake, M.D., Takanobu Sato, M.D., Tetsuro Higuchi, M.D., Tetsuo Nemoto, M.D., Kenichi Sugihara, M.D.
Erschienen in:
Diseases of the Colon & Rectum
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Ausgabe 11/2004
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PURPOSE
Cyclooxygenase-2 is thought to play a role in the development of intestinal tumors and levels are elevated in approximately 80 to 90 percent of human colorectal carcinomas. To clarify the role that cyclooxygenase-2 plays in the development of colorectal carcinoma, we studied the relationship between cyclooxygenase-2 expression and tumor morphology and that between cyclooxygenase-2 expression and K-ras mutation.
METHODS
We classified 48 T1 colorectal carcinomas as polypoid or nonpolypoid and analyzed the clinicopathologic features. The expression of cyclooxygenase-2 was determined immunohistochemically, and nested polymerase chain reaction-restriction fragment length polymorphism detected a K-ras codon 12 mutation.
RESULTS
Cyclooxygenase-2 expression was higher in polypoid carcinomas than in nonpolypoid carcinomas (P < 0.001). The K-ras codon 12 mutation was associated with higher levels of cyclooxygenase-2 expression compared with carcinomas without this mutation (P = 0.028).
CONCLUSIONS
Polypoid growth and K-ras gene mutation are both associated with increased levels of cyclooxygenase-2 expression in T1 tumors.