Second, because of the low frequency of TNBC in the whole population, the number of TNBC cases only accounted for 11.1% of all the breast cancer patients in this study, while for the TNBC subgroup, the number of “low Ki-67” and grade 1, 2 patients was the smallest in the study, only 33 cases. The gene discussed is MKI67; the disease is breast carcinoma.