TERT and central nervous system cancer: Previous studies have focused on the risk of many cancer types like glioma [8], thyroid [9], melanoma [10], breast [11], ovarian [12], endometrial [13], liver [14] and pancreatic cancer [15], Therefore, we hypothesized that polymorphisms in TERT may affect the control of telomere length, resulting in invasion and metastasis of gastric tumors.