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05 or less then 0.01). Based on the independent risk factors,a nomogram prediction model was established. The C indexes of the model group and the validation group were 0.739 (95%0.693-0.785) and 0.736 (95%0.678-0.793),respectively. The calibration curve and DCA curve of the modeling group and the verification group indicated that the model was consistent and had good clinical benefit. Primary tumor size,histopathological grade,vascular tumor thrombus,Ki-67,and ER status are predictors of ipsilateral axillary lymph node metastasis in T1 breast cancer. The e