Fumonisin B1 is produced by the strain of Gibberella fujikuroi and Fumarium moniliforme. It is a liver toxin, which can activate the cancer promoter and cause liver cancer. It has been reported that it is related to the occurrence of human esophageal cancer in South Africa and other places. It can also cause pig pulmonary edema, and is also the pathogenic substance of equine leukoencephalitis. Fumonisin B1 inhibits sphingosine acyltransferase.