p21 ras protein overexpressions in NPC were related to the metastasis of cervical lymph node and the degree of differentiation of the tumor cells.

• p21ras蛋白过表达与有无伴颈淋巴结转移呈正相关，与鼻咽癌分化程度呈负相关，预示p21ras可作为判断鼻咽癌预后的标记之一。