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Concentration of 25(OH)-vitamin D and osteopontin in the blood serum of patients with lip, oral cavity, or pharyngeal cancer depending on age and in the healthy group. (a) 25(OH)-vitamin D concentration, (b) osteopontin concentration. YCG: younger cancer group—mean age 58.24 ± 1.29 yrs; OCG: older cancer group—mean age 69.70 ± 1.49 yrs. Data are presented as the means ± S.E.M. ∗p < 0.05 vs. control group.
