title: Expression of epidermal growth factor receptor messenger RNA in human colorectal carcinomas assessed by non-radioactive in-situ hybridization.
abstract: No consensus as to the involvement of the epidermal growth factor receptor (EGF-R) in colorectal carcinomas has yet been attained, although they are assumed to play a role in the metastasis to lymph nodes and recurrence of breast carcinoma and bladder carcinoma invasion. Knowing that Dukes' classification of colorectal carcinoma is closely related to prognosis, we examined whether there is a correlation between Dukes' classification and the expression of EGF-R in colorectal carcinoma. If there is a positive correlation, the involvement of EGF-R in the processes may be assumed and the expression of EGF-R may be used as a marker of their prognosis. To this end, the expression of EGF-R mRNA and protein by non-radioactive in-situ hybridization and immunohistochemistry, respectively, were determined on histological preparations of formalin-fixed paraffin-embedded colorectal surgical specimens. In 30 cases of colorectal carcinoma examined, mRNA and/or protein was detected in 33% (two of six) of Dukes' A, in 40% (four of 10) of Dukes' B, in 36% (four of 11) of Dukes' C, in 33% (one of three) of Dukes' D and in 0% of normal colon epithelial cells. Thus, there was no positive correlation between the Dukes' classification and the expression of EGF-R. It is concluded that the expression of EGF-R in colorectal carcinoma is not a promising marker of prognosis. However, the role of EGF-R in EGF-R positive tumours remains to be examined.
authors.affiliation: Department of Surgery II, Nagasaki University School of Medicine, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Komuta
authors.forename: T
authors.initials: T
authors.lastname: Koji
authors.forename: S
authors.initials: S
authors.lastname: Izumi
authors.forename: T
authors.initials: T
authors.lastname: Matsumoto
authors.forename: N
authors.initials: N
authors.lastname: Kohara
authors.forename: K
authors.initials: K
authors.lastname: Motojima
authors.forename: T
authors.initials: T
authors.lastname: Kanematsu
authors.forename: P K
authors.initials: PK
authors.lastname: Nakane
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001483:Base Sequence; D015179:Colorectal Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D066246:ErbB Receptors / Q000096:biosynthesis* / Q000235:genetics; D005260:Female; D015870:Gene Expression; D006801:Humans; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D009367:Neoplasm Staging; D012333:RNA, Messenger / Q000032:analysis*; D012334:RNA, Neoplasm / Q000032:analysis*
chemical_list: D012333:RNA, Messenger; D012334:RNA, Neoplasm; D066246:ErbB Receptors