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Insufficient vitamin D levels in CLL patients linked to cancer progression and death
Date:11/4/2010

to 1 billion people worldwide have vitamin D insufficiency," he says.

Vitamin D is obtained from skin exposure to sunlight, from certain foods (fatty fish and eggs) and from supplements.

In this study, the research team, including physicians at the University of Iowa (http://www.uihealthcare.com/), enrolled 390 CLL patients into a prospective, observational study. They tested the blood of these newly diagnosed patients for plasma concentration of 25-hydroxyl-vitamin D and found that 30 percent of these CLL patients were considered to have insufficient vitamin D levels, which is classified as a level less than 25 nanograms per milliliter.

After a median follow-up of three years, CLL patients deficient in vitamin D were 66 percent more likely to progress and require chemotherapy; deficient patients also had a two-fold increased risk of death.

To confirm these findings, they then studied a different group of 153 untreated CLL patients who had been followed for an average of 10 years. The researchers found that about 40 percent of these 153 CLL patients were vitamin D deficient at the time of their diagnosis. Patients with vitamin D deficiency were again significantly more likely to have had their leukemia progress and to have died, Dr. Shanafelt says.

"This tells us that vitamin D insufficiency may be the first potentially modifiable risk factor associated with prognosis in newly diagnosed CLL," he says.


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Contact: Nicole Engler
newsbureau@mayo.com
507-284-5005
Mayo Clinic
Source:Eurekalert

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