title: Immunohistochemical detection of ras 21 in oral squamous cell carcinomas.
abstract: The expression of the ras p21 in oral squamous cell carcinoma was examined immunohistochemically with the use of a monoclonal antibody NCC-RAS-001 with the avidin-biotin-peroxidase complex method. The expression of ras p21 product was detected in 65.7% (44 of 67 cases) of cancer patients. On the basis of the degree of histologic differentiation of the cancer cells, the incidence of ras p21 was found to be as follows: 63.4% (26 of 41 cases) were well differentiated; 86.7% (13 of 15 cases) were moderately differentiated; and 45.5% (5 of 11 cases) were poorly differentiated. The highest incidence was found in patients in their sixties--80.0% (16 of 20 cases). The incidence decreased to 40% in patients over 80 years of age. The incidence of ras p21 on the basis of location was as follows: 81.8% (9 of 11 cases) involved the buccal region, 70.6% (12 of 17 cases) were in the gingiva, and 55.0% (11 of 20 cases) were in the tongue.
authors.affiliation: Department of Oral Pathology, School of Dentistry, Iwate Medical University, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Satoh
authors.forename: S
authors.initials: S
authors.lastname: Hatakeyama
authors.forename: M
authors.initials: M
authors.lastname: Sashima
authors.forename: A
authors.initials: A
authors.lastname: Suzuki
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002294:Carcinoma, Squamous Cell / Q000737:chemistry* / Q000235:genetics / Q000473:pathology; D005260:Female; D015870:Gene Expression; D005887:Gingival Neoplasms / Q000737:chemistry / Q000235:genetics / Q000473:pathology; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D008875:Middle Aged; D009061:Mouth Mucosa / Q000737:chemistry; D009062:Mouth Neoplasms / Q000737:chemistry* / Q000235:genetics / Q000473:pathology; D016283:Proto-Oncogene Proteins p21(ras) / Q000032:analysis*; D014062:Tongue Neoplasms / Q000737:chemistry / Q000235:genetics / Q000473:pathology
chemical_list: C501009:HRAS protein, human; D016283:Proto-Oncogene Proteins p21(ras)