Application of MLH1 gene, and kit for detecting gastrointestinal stromal tumor

The present invention discloses an application of a MLH1 gene, and a kit for detecting a gastrointestinal stromal tumor, wherein the kit comprises MLH1 gene sequencing primers. According to the present invention, the inventor finds that: the gastrointestinal stromal tumor is caused by the common KIT and PDGFRA gene mutations, and the MLH1 (V384D) mutation is one of the causes of the gastrointestinal stromal tumor, such that the kit for detecting the gastrointestinal stromal tumor can be provided for rapidly and accurately detecting the MLH1 mutation site of the gastrointestinal stromal tumor and assistedly diagnosing the gastrointestinal stromal tumor so as to assistedly treat the gastrointestinal stromal tumor based on the finding; and after the MLH1 (V384D) mutation is detected by using the kit, the gene targeting drug can be adopted to specifically treat patients, such that the use of the targeting drug is specific.