My wife has annual mammograms with the NHS (just had her 3rd since we returned in 2016) because her sister, mother and aunt all had to have lumpectomies.
My sister, in her late 30's, had cervical cancer detected on a 3 year routine pap smear. Needed a couple of procedures to clear it. She then had 3 monthly, then 6 monthly tests for 5 years until she was given the all clear. I think she may still be on annual smear tests over 10 years later.