How do I prevent gyn cancer?

Gyn tract includes: Ovaries, fallopian tubes, uterus (endometrium + cervix), vagina, and vulva. The regular gyn exam inspects and scrapes cells from the uterus to early detect cervix. Cx and vulva are linked to hpv, and the gardisil vaccine prevents. No good methods for the others.
Different types. There are different types of gyn cancers that require different strategies. For cervical cancer - regular pap smear exams and test for hpv is effective. Other gyn cancers, e.g., uterus and ovary, require close consultation with your doctor, paying attention to any pelvic and abdominal symptoms, careful use of hormone, and regular check ups.