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Blacks not receiving chemotherapy for rectal cancer, despite seeing cancer specialists

ANN ARBOR, Mich. Black patients and white patients are seeing rectal cancer specialists at similar rates, but blacks are still less likely to receive chemotherapy or radiation therapy, according to a new study from the University of Michigan Comprehensive Cancer Center.

The study found blacks were 23 percent less likely to receive chemotherapy for rectal cancer and 12 percent less likely to receive radiation therapy than whites.

Although there wasnt a discrepancy between African Americans and whites in the rates of consultation with an oncologist, we found a large discrepancy in the receipt of chemotherapy. This is very important. We knew that African Americans were not receiving chemotherapy for rectal cancer at the same rates as white Americans and it was contributing to their increased mortality. Now we have a better idea of where the problem lies: somewhere between the visit with the oncologist and the actual initiation of chemotherapy, says study author Arden Morris, M.D., M.P.H., assistant professor of surgery at the U-M Medical School and chief of general surgery at the VA Ann Arbor Healthcare System.

The study appears online May 13 in the Journal of the National Cancer Institute.

The researchers found that 73 percent of blacks and 75 percent of whites saw a medical oncologist after being diagnosed with rectal cancer. But only 54 percent of blacks went on to receive chemotherapy, while 70 percent of whites did. Similarly, rates of referral to a radiation oncologist did not differ significantly, but only 74 percent of blacks, compared to 83 percent of whites, received radiation.

The data came from the Surveillance, Epidemiology and End Results Registrys Medicare-linked database. SEER is maintained by the National Cancer Institute and collects information about cancer incidence, treatment and mortality. The study looked at 2,582 whites and 134 blacks aged 66 and older who had been diagnosed with rectal cancer.

Long-term survival after rectal cancer surgery is up to 20 percent worse for blacks than for whites. At the same time, the addition of chemotherapy and radiation is known to improve survival in all rectal cancer patients by as much as 20 percent. Researcher suspect the lack of treatment in blacks is largely driving the decreased survival.

We now know that the initial visit with an oncologist is not the barrier to treatment. Our next step is to better understand what are the human factors that contribute to this discrepancy. Were interested in hearing what individual people have to say, Morris says.

Her next study will include focus groups of people who have been treated for colorectal cancer to understand how they reached the decision to have chemotherapy or whether they feel they made a decision at all. The researchers suspect treatment discrepancies may be due in part to social differences and priorities among populations, such as patient preferences or access to resources including transportation or family care.

Choice is important. If theres a choice, this maybe isnt a disparity but a preference. But if its not a choice, then we need to understand the barriers and find solutions, Morris says.


Contact: Nicole Fawcett
University of Michigan Health System

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