• Department of General Surgery, The First Affiliated Nanjing Hospital of Nanjing Medical University, Nanjing 210006, Jiangsu Province, China;
LU Chengyu, Email: lcy_1234@yahoo.com.cn
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Objective  To further comprehend the definition, molecular mechanism, and clinical significance of perineural invasion (PNI) so as to explore new therapy for the tumors.
Methods  The literatures about the definition, molecular mechanism, and clinical study of PNI were reviewed and analyzed.
Results  At present, widely accepted definition of PNI was that at least 33% of the circumference of the nerve should be surrounded by tumor cells or tumor cells within any of three layers of the nerve sheath. The newest theory on molecular mechanism of PNI was that PNI was more like infiltration, invasion, not just diffusion. “Path of low-resistance” and “Reciprocal signaling interactions” were the main theories. More recently, the studies had demonstrated that “Reciprocal signaling interactions” could more clearly explain the mechanism of PNI. Stromal elements, including fibroblasts, seemed to play a key role in the complex signaling interactions driving PNI. Neurotrophins and axonal guidance molecules had been implicated in promoting the progress of PNI. PNI was a prognosis index in the cancers of the head and neck, stomach, pancreas, colon and rectum, and prostate, which was positive indicated that the patients would have a poor prognosis and a low 5-year survival rate.
Conclusions  The mechanism of PNI is very complex, and its clear mechanism is still undefined. Keeping on researching the mechanism of PNI could provide theoretical foundation to disclose the mechanism and the therapy of PNI.

Citation: ZHOU Tao,LU Chengyu,YAO Jianhong,ZHANG Yifan,CHEN Wei,YUAN Aihua. Research Progression of Perineural Invasion of Tumor. CHINESE JOURNAL OF BASES AND CLINICS IN GENERAL SURGERY, 2013, 20(5): 569-573. doi: Copy

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