41.   Some have blamed diet and other lifestyle factors, race-based genetic variation, environmental exposure to toxins and inequitable cancer screening and treatment.

42.   Spiral C.T. scanning of the lungs epitomizes the dilemma that plagues modern cancer screening.

43.   The Dana-Farber researchers in Boston based their conclusion on a reanalysis of earlier randomized clinical trials that scientists had thought argued against lung cancer screening.

44.   The House Medicare legislation will also likely expand coverage for cancer screening.

45.   The package would further tighten medical privacy laws, as well as require plans to provide coverage for severe mental illness, prescription contraceptives and cancer screening.

46.   The most common method of colon cancer screening is flexible sigmoidoscopy because it is now covered by Medicare.

47.   The plan also would encourage more preventive care by removing the deductible for tests such as mammograms and prostate cancer screening.

48.   The other advance is the use of positron emission tomography for breast cancer screening.

49.   The vetoed legislation included a bill that would have provided contraception and cancer screening to poor women and created a public advocate for health insurance.

50.   The test did not produce false positives, however, one of the main problems with some types of cancer screening.