I would advise anyone who has any cancer or a family history of cancer to get their vitamin D levels checked and to check them periodically.

Vitamin D deficiency has been linked to 28 types of cancers. High vitamin D levels are cancer preventive. Vitamin D and vitamin D analogs have been used in the treatment of cancer alone and in conjunction with conventional therapy with excellent results.

As the Vitamin D Council says, "It's not yet 100% proven that vitamin D will prevent or cure cancer but why should you suffer from vitamin D deficiency at the same time you have cancer."

Or something to that effect.

Vitamin D tells cells when to die and cancer is unregulated cell growth.

Vitamin D deficiency is also linked to diabetes and insullin resistance and most cancers feed on sugar.