Is overexpression of c-H-ras p21 correlated with vascular endothelial growth factor expression and neovascularization in advanced gastric carcinoma?
We suggest that c-H-ras oncogene product p21 contributes to the upregulation of tumor-associated angiogenesis by the increased production of VEGF in advanced gastric carcinomas. Therefore, treatment involving the targeting of ras oncogene could inhibit solid tumor growth by suppressing tumor-associated angiogenesis.
We suggest that when a polypoid lesion of the gallbladder is found on preoperative evaluation, laparoscopic surgery may be attempted initially. During the procedure it is important to open all specimens when a polypoid lesion is present and perform a frozen section biopsy. When a pT1a lesion is found, laparoscopic cholecystectomy is sufficient; however, when a pT1b or more advanced lesion is found, the operation might be converted to a radical cholecystectomy.