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Calcitriol sensitizes colon cancer cells to radiation. DLD-1, HCT116, and SW620 colon cancer cells were pre-treated with 1 μM calcitriol (gray bars) or vehicle (black bars) for 24 h prior to radiation treatment of 0–6 Gy. After 10 d, surviving colonies of 20 or more cells were counted to determine the % survival relative to the untreated cells. *P < 0.01, **P < 0.05.
