英语语法分析

Objective: to provide morphologic evidence for the lymphadenectomy of the ovarian malignant tumor.

目的为卵巢恶性肿瘤手术的淋巴结清扫提供形态学依据。

Background Gastrectomy with D2 lymphadenectomy is the standard treatment for curable gastric cancer in eastern Asia.

背景在东亚，胃癌d 2根治术是治疗有潜在治疗可能的胃癌的标准术式。

However, D2 lymphadenectomy plus PAND in node-positive patients resulted in poorer survival rates than D2 lymphadenectomy alone.

然而，主动脉旁淋巴结转移的患者的术后生存率比d 2根治术的术后生存率要低。