Doctors are taking issue after a top panel of health experts calls for men to abandon routine prostate-specific antigen tests that screen for cancer. The report says over-screening could lead to unnecessary and often dangerous medical procedures. The debate over p-s-a's has also sparked discussion about mammograms -- and whether repeated x-rays can cause cancer among women. That question has led some to give up the procedure altogether and switch to holistic approaches.. Such as thermography.