Expression of p53, p21(CIP1/WAF1) and eIF4E in the adjacent tissues of oral squamous cell carcinoma: establishing the molecular boundary and a cancer progression model.

Yi LI; Bo LI; Bo XU; Bo Han; Hui Xia; Qian-ming Chen; Long-jiang LI

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Expression of p53, p21(CIP1/WAF1) and eIF4E in the adjacent tissues of oral squamous cell carcinoma: establishing the molecular boundary and a cancer progression model.

Author: Yi LI ¹ ; Bo LI ¹ ; Bo XU ¹ ; Bo HAN ² ; Hui XIA ² ; Qian-Ming CHEN ¹ ; Long-Jiang LI ¹
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1. State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
2. Department of Head and Neck Oncology, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
Publication Type:Journal Article
MeSH: Adult; Aged; Carcinoma, Squamous Cell; metabolism; pathology; Cyclin-Dependent Kinase Inhibitor p21; metabolism; Disease Progression; Eukaryotic Initiation Factor-4E; metabolism; Female; Humans; Male; Middle Aged; Mouth Neoplasms; metabolism; pathology; Tumor Suppressor Protein p53; metabolism
From: International Journal of Oral Science 2015;7(3):161-168
CountryChina
Language:English
Abstract: The present study evaluated the expression of key molecules and the status of DNA in both oral squamous cell carcinoma (OSCC) and adjacent tissues to establish a molecular surgical boundary and provide a cancer progression model. Biopsy samples from 50 OSCC patients were divided into T (cancer), P1 (0-0.5 cm), P2 (0.5-1 cm), P3 (1-1.5 cm) and P4 (1.5-2 cm) groups based on the distances from the visible boundary of the primary focus. Twenty samples of normal mucosa were used as controls. We used immunohistochemical staining and flow cytometry to evaluate p53, p21(CIP1/WAF1), eIF4E and Ki-67 expression and to determine DNA status, respectively. Sub-mucosal invasion was present in the P1 and P2 groups as determined by haematoxylin and eosin staining. Mutant p53 expression decreased gradually from cancerous to normal mucosae, whereas p21(CIP1/WAF1) expression displayed an opposite trend. eIF4E expression decreased from cancerous to normal mucosae. Ki-67 expression, the heteroploidy ratio, S-phase fraction and proliferative index decreased gradually with the distance from the tumour centre. Based on these results, we suggest that the resection boundary in OSCC surgery should be beyond 2 cm from the tumour. Additionally, the adjacent tissues of the primary focus could be used as a model for assessing cancer progression.