2 Clinical data <br>collection of surgically resected specimens of advanced malignant tumors with lymph node metastasis. A total of 343 specimens of radical resection of malignant tumors were collected from December 2018 to October 2019 in clinical pathological biopsy of the Second Affiliated Hospital of Xi'an Jiaotong University, including 122 cases of gastric cancer, 118 cases of colorectal cancer, and 103 cases of breast cancer. At the same time, collect the clinical data of the above patients, including: gender, age, etc.
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