PPARγ is expressed in normal intestinal mucosa, colorectal cancer tissues, and paraneoplastic tissues, and the level of PPARγ expression is related to the tumor cell differentiation, infiltration, and metastasis [34, 35]: (1) the higher the differentiation level of colorectal cancer tissue, the higher the expression level of PPARγ protein; (2) the protein expression level of PPARγ is positively related to the range of the infiltration, lymph node metastasis, or distant metastasis. The gene discussed is PPARG; the disease is colorectal cancer.