Postoperative pathology grading of breast cancer mp5 means that essentially no tumor cells can be found, but some carcinoma in situ may remain. The MP grading system is a five-grade classification method ,which grades the percentage of tumor cell reduction after treatment by paired examination of specimens before and after surgery. MP grading is generally divided into 5 levels, from 1-5, according to the proportion of tumor cells disappearing, level 1 is unchanged less than 10%, level 2 is less than 30%, level 3 is 30-90%, level 4 is the obvious reduction of tumor cells, which is greater than 90%, and level 5 is basically unable to find the tumor cells, but some carcinoma in situ may be left. It can be seen that the postoperative pathological classification of breast cancer mp5 indicates that the postoperative effect is very good.