Moderately differentiated adenocarcinoma generally refers to a type of cancer in which the cancer cells originate from glandular epithelial tissue cells and are moderately differentiated. Adenocarcinoma is a common pathological type of cancer. Since its cancer cells originate from glandular epithelial cells, this type of cancer can occur in any part of the body where glandular epithelial cells exist, such as lung adenocarcinoma, stomach adenocarcinoma, and clinically, adenocarcinomas are classified into three types according to different differentiation degrees of adenocarcinomas, namely, poorly-differentiated, moderately-differentiated and highly-differentiated. Generally speaking, according to the different differentiation degree of adenocarcinoma cells, the degree of malignancy of adenocarcinoma is also different. Generally speaking, the lower the differentiation degree of adenocarcinoma cells, the more obvious the difference between adenocarcinoma cells and normal cells, the more malignant the adenocarcinoma is, and the more likely for adenocarcinoma patients to suffer from recurrence and metastasis.