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Clinical Cancer Research Vol. 5, 2884-2890, October 1999
© 1999 American Association for Cancer Research

Experimental Therapeutics, Preclinical Pharmacology

Inverse Relationship between Epidermal Growth Factor Receptor Expression and Radiocurability of Murine Carcinomas1

Tetsuo Akimoto, Nancy R. Hunter, Lara Buchmiller, Kathy Mason, K. Kian Ang and Luka Milas2

Department of Experimental Radiation Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030

The study investigated whether a relationship exists between the extent of epidermal growth factor receptor (EGFR) expression and in vivo radiocurability of murine tumors. EGFR expression was determined in nine carcinomas (four mammary carcinomas, designated MCa-4, MCa-29, MCa-35, and MCa-K; two squamous cell carcinomas, designated SCC-IV and SCC-VII; an ovarian adenocarcinoma, OCa-I; a hepatocarcinoma, HCa-I; and an adenosquamous carcinoma, ACa-SG) syngeneic to C3Hf/Kam mice using Western blot analysis. These tumors greatly differed in their radioresponse, assessed by TCD50 assay, and in their susceptibility to radiation-induced apoptosis. Likewise, the expression of EGFR greatly varied, by as much as 21-fold, and the magnitude of the EGFR expression positively correlated with increased tumor radioresistance. The levels of EGFR inversely correlated with radiation-induced apoptosis, suggesting that the lack of sensitivity to apoptosis induction was a major mechanism responsible for radioresistance of tumors with high EGFR. This correlation was highly significant only for wild-type p53 carcinomas. Radiation activated EGFR autophosphorylation and increased the activity of protein tyrosine kinase, but only in tumors with high EGFR expression. Thus, EGFR expression was a major determinant of tumor radioresponse in vivo. The pretreatment assessment of EGFR expression could predict radiotherapy outcome and may assist in selecting an effective treatment modality.




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