[The TP53 and RPS6 alterations at the invasive tumor front, center and stroma of oral squamous cell carcinoma].

To assess the difference of genetic alteration patterns among different areas in the same oral squamous cell carcinoma (OSCC).,Studied the loss of heterozygosity (LOH) and microsatellite instability (MI) at chromosomal loci TP53 and RPS6 on the invasive tumor front (ITF), the center/superficial part and stroma cells by combining laser capture microdissection (LCM) and PCR technique.,There existed a high frequency of LOH and MI on chromosomes loci TP53 and RPS6. The frequency of RPS6 and TP53 aberration at the stroma was 23.5% (4/17) and 43.8% (7/16), respectively. While in epithelial part (both ITF and center), it reached up to 64.7% (11/17) and 70.6% (12/17) respectively, and the difference was significant (P < 0.05). The overall frequency of the two markers was statistically higher at the ITF (20/32) than at the center/superficial part (15/34) (P < 0.05).,The current study revealed that genetic alterations were different in different areas of the same tumor and there existed a relationship between the histological grading and genotypes of OSCC.