SLC6A8 and esophageal squamous cell carcinoma: Interestingly, based on analysis of the microarray data derived from Oncomine database (https://www.oncomine.org/resource/login.html), we unraveled an enhanced SLC6A8 expression in other solid cancers, such as bladder cancer, colorectal cancer, esophageal squamous cell carcinoma, clear cell renal cell carcinoma, squamous cell lung carcinoma and melanoma (Figure S2), suggesting a popularly enhanced SLC6A8 expression in solid tumors.