Results In the 14 cases of OSCC,the expression rate of PCNA was 100%,while that in normal mucosa was weak.

• 结果正常口腔黏膜中PCNA仅在基底细胞层有少量表达；癌组织中PCNA的表达率为100%25；其表达强度与病理分级呈正相关(P=0.；006)。