How many years is the best interval for regular check-up of breast cancer in mother's health project?

Every 1 ~ 2 years, women over the age of 35 have their breasts examined once a year, and high-risk groups have their breasts examined once every six months. The "two cancers" screening project launched by the state this time is to provide rural women with opportunities for early screening. Only by actively participating in the examination can we find and treat it in time.