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Breast cancer patients who have adequate levels of vitamin D—the "sunshine vitamin"—at the time of their diagnosis have better long-term outcomes, a new study finds.

Combined with the results of prior research, the new findings suggest "an ongoing benefit for patients who maintain sufficient levels [of vitamin D] through and beyond breast cancer treatment," said study lead author Song Yao. He's a professor of oncology in the department of cancer prevention and control at Roswell Park Comprehensive Cancer Center in Buffalo, N.Y.

The study also found that Black women had the lowest ...