61.   Smoking is considered to be a primary cause of lung cancer, for example, but people who have never smoked also develop the disease.

62.   So blood tests to detect PSA are widely used to screen for prostate cancer and to monitor men who previously developed the disease and have been treated for it.

63.   Since as many as a million American women have had implants, it would be expected that, by chance alone, thousands would develop these diseases.

64.   Some exposed people may never develop the disease, while it may flare up in others as their immune systems become compromised.

65.   That gene, carried by four to eight percent of Americans, does not determine whether an individual is likely to develop the disease, as scientists thought.

66.   The disclosure raises speculation about when Reagan developed the disease.

67.   The genetic risk factor, they say, explains why one person develops a disease while another, equally exposed, does not.

68.   The longer a person is exposed to radiation, research suggests, the more likely that person is to develop disease.

69.   The researchers found an inverse correlation between the frequency of cognitive activity and the risk of developing the disease.

70.   The risk that insurers might use the information to discriminate against Icelanders who are likely to develop diseases is one of the second thoughts now occurring to people.