NOS2 and carcinoma of esophagus: The iNOS expression is reported in prostate cancer [60, 61], colon adenocarcinoma [62, 63], breast cancer [64, 65], melanoma cancer [66, 67], esophageal carcinoma [68], cervical squamous cell carcinoma [69], stomach adenocarcinoma [70], kidney renal clear cell carcinoma [71], and lung squamous cell carcinoma [72].