First of all there is discrepancy in the age mentioned. For age 27 years, no screening tests are recommended except self breast examination unless you have a strong family history.
Let's consider you are 58 years old. You should undertake routine health check up once a year which should include USG whole abdomen, Mammography of both breast and PAP smear along with routine tests.
Next Steps
unless there is strong family history no genetic testing is advisable
Health Tips
consult Oncologist with all your reports so that all your doubts can be cleared. physical examination is also required.