Final answer:
Women with Lynch II (HNPCC) mutation or a family member with the mutation should undergo endometrial biopsy (EMB) at age 30.
Step-by-step explanation:
Women with Lynch II (HNPCC) mutation or a family member with the mutation should undergo endometrial biopsy (EMB) at age 30. This is because Lynch II mutation carriers have an increased risk of developing endometrial cancer, which often occurs at an earlier age compared to the general population. By performing regular EMBs, any precancerous or early-stage endometrial cancer can be detected and treated in a timely manner, leading to better outcomes.