Methylthioadenosine phosphorylase (MTAP)is a rate-limiting enzyme in the methionine and purine salvage pathway,and is closely related to polyamine metabolism,adenine metabolism and methionine metabolism. MTAP is frequently deleted in malignant mesothelioma (MM)and plays an important role in the diagnosis and differential diagnosis of MM. At the same time,metabolic reprogramming caused by MTAP deletion creates new therapeutic strategies for MM. Besides,MTAP gene is also associated with the prognosis of MM,therefore MTAP is a significant biomarker for the diagnosis,treatment and prognosis of MM.