Doctors
have known that low levels of vitamin D are linked to certain kinds of
cancers as well as to diabetes and asthma, but new research also shows
that the vitamin can kill human cancer cells. The results fall short of
an immediate cancer cure, but they are encouraging, medical
professionals say. JoEllen Welsh, a researcher with the State University
of New York at Albany, has studied the effects of vitamin D for 25
years. Part of her research involves taking human breast cancer
cells and treating them with a potent form of vitamin D. Within a few
days, half the cancer cells shriveled up and died. Welsh said
the vitamin has the same effect as a drug used for breast cancer
treatment. "Vitamin D enters the cells and triggers the cell death
process," she [said]. "It's similar to what we see when we treat cells
with Tamoxifen," a drug used to treat breast cancer. The vitamin's
effects were even more dramatic on breast cancer cells injected into
mice. After several weeks of treatment, the cancer tumors in the mice shrank by an average of more than 50 percent. Some tumors disappeared. Similar results have been achieved on colon and prostate cancer tumors in mice.
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