Thanks for using HCM Fibroids in uterus is a benign condition. Chances of Turing into malignant is very very rare. You need not have to worry for that. If your fibroid is causing any symptoms like pain or pressure on bladder, then you need treatment for that, otherwise not required. Your endometrial thickness, you have not mentioned on which day of your cycle you got it checked, because endometrial thickness varies in a cycle. Since one of your sister has endometrial cancer, its a risk factor. You need regular screening test. You need to get self examination of breast regularly. Any change in your periods like irregular bleeding, heavy bleeding, prolonged bleeding needs to be evaluated. Have a good health Regards Dr. Vidys