PMID: 11932899Apr 5, 2002Paper

Prognostic value of p53 mutations, bax, and spontaneous apoptosis in maxillary sinus squamous cell carcinoma

Cancer
Nobuyuki BandohYasuaki Harabuchi

Abstract

Many researchers have attempted to correlate p53 mutation and spontaneous apoptosis with the effectiveness of radiochemotherapy and with prognosis in several malignancies. The current study group consisted of 70 Japanese patients with maxillary sinus squamous cell carcinoma (SCC). Fifty seven patients were treated with radiochemotherapy followed by total or partial maxillectomy, and the remaining 13 patients were treated with radiotherapy alone. Tumor biopsy specimens at pretreatment status were examined for apoptosis-related proteins such as p53 protein, Fas, bax, bcl-x, and apoptosis using immunohistologic methods. The proportion of apoptotic cells labeled by single stranded DNA antibody was expressed as an apoptotic index (AI). p53 mutations at exons 5 through 8 were analyzed by direct sequence on polymerase chain reaction amplified products obtained from laser microdissected tissues. The effectiveness of radiochemotherapy was investigated histologically on surgically dissected specimens. p53 mutations were identified in 20 (29%) of 70 patients. p53 protein was overexpressed in 39 patients (56%), Fas in 20 patients (29%), bax in 40 patients (57%), and bcl-x in 33 patients (47%). Overexpression of bax was associated with nega...Continue Reading

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