By studying changes in tumor tissue from colon cancer patients whose cancers had not spread to distant organs, researchers were able to isolate a gene mutation that led to a poor outcome.
Stage I through III colon cancer patients whose tumors had a mutation in the PIK3CA gene were more likely to die of colon cancer that patients with normal or wild-type PIK3CA. About 1 in 5 patients had that mutation in tumor tissue.
After adjusting for other variables that affect death from colon cancer, patients with a PIK3CA mutation were more than twice as likely to die from colon cancer. This was especially true in KRAS wild-type tumors where a PIK3CA mutation increased risk of death almost four times. However, in KRAS mutated tumors, the presence of PIK3CA made little difference in cancer-specific survival. Read the rest of this entry »
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