Smokers With Advanced Colon Cancer May Face Higher Odds Of Disease Recurrence

Based on data from 965 patients treated for stage III colon cancer, investigators found the chances of recurrence or death up to 22 percent higher in patients with a 20 or more pack year history (calculated by number of years smoking times packs per day) than in those who had never smoked. Smoking history prior to age 30 was particularly harmful for subjects that developed colon cancer years later. Patients who smoked 12 pack years or more before age 30 and developed colon cancer later in life had a statistically significant 37 percent increase in recurrence or death compared to nonsmokers.

"After controlling for other factors that may influence the risk of colon cancer recurrence or death, this study highlights further risk of cancer recurrence in individuals who have a higher lifetime total use of cigarettes than never smokers," said lead author Nadine Jackson, MD, MPH, of Dana-Farber.

Although tobacco use can increase people's initial risk of colon cancer, little is known about the short- or long-term effects of such use on disease recurrence. The current study is part of an effort to explore that issue.

Participants in the study reported their tobacco use on questionnaires filled out during and six months after their treatment. Forty-five percent were identified as past smokers, 9 percent as current smokers, and 46 percent as never smokers.

The study's co-authors are Jeffrey Meyerhardt, MD, MPH, Charles Fuchs, MD, MPH, and Robert Mayer, MD, of Dana-Farber, Boston; Donna Niedzwiecki, PhD, and Donna Hollis, PhD, of the Cancer and Leukemia Group B, Durham, N.C.; and Leonard Saltz, MD, of Memorial Sloan-Kettering Cancer Center, New York.