Family history of colorectal cancer linked with reduced risk of cancer ...( Among patients with advanced colon c...),Health

Among patients with advanced colon cancer receiving treatment that includes chemotherapy, a family history of colorectal cancer is associated with a significant reduction in cancer recurrence and death, with the risk reduced further by having an increasing number of affected first-degree relatives, according to a study in the June 4 issue of JAMA.

Approximately 16 percent to 20 percent of patients with colorectal cancer have a first-degree relative with colorectal cancer. Beyond rare but highly penetrant hereditary colorectal cancer syndromes, numerous studies have demonstrated that a history of colorectal cancer in a first-degree relative increases the risk of developing the disease by approximately 2-fold. However, the influence of family history on cancer recurrence and survival among patients with established colon cancer remains uncertain, the authors write.

Jennifer A. Chan, M.D., M.P.H., of the Dana-Farber Cancer Institute, Boston, and colleagues examined the association of family history of colorectal cancer with recurrence and survival of 1,087 patients with stage III colon cancer who were receiving supplemental chemotherapy. Patients provided information on family history of colorectal cancer at the beginning of the study, and were followed up until March 2007 for cancer recurrence and death (median [midpoint] follow-up, 5.6 years).

Among the 1,087 participants, 195 (17.9 percent) reported a family history of colorectal cancer in 1 or more first-degree relatives. The researchers found that a family history of colorectal cancer was associated with a significant reduction in the risk of cancer recurrence or death. Compared with patients without a family history, those with a family history had a 28 percent lower risk for cancer recurrence or death, which occurred in 57 of 195 patients (29 percent) with a family history of colorectal cancer compared with 343 of 892 patients (38 percent) without a family history.

Exami
'/>"/>