Any actual content of fumonisin  in the urine will probably have little or no relationship with the previous exposure causing the cancer. Remember that carcinoma formation generally has quite a long "incubation" period.

Hi, Mohammadreza, good day. After a brief literature search, I discover that fumonisin contamination is commonly found in staple foods, especially rice, which, may be considered as a potential risk factor for esophageal cancer in certain high risk regions including where you are now, China, Mexico and Africa.

Thank you