It seems that cancer can only occur when the p53 system is somehow damaged.

This cancer usually occurs in women older than age 50.

This allows the person to receive a high dose of drugs in the area where the cancer occurred.

About 77% of breast cancers occur in women over 50.

Critics of the study note that the levels at which cancer occurred were 45 to 79 times higher than normal human exposure.

When she first felt a lump several years ago, cancer didn't occur to her.

The resulting cancers can also occur at a relatively young age.

About 17.5 percent of breast cancers occur among the 17 million American women under 50.

Given these odds, it is amazing that cancer doesn't occur more often.

The cancer occurs within the treated area of the patient.