CD44 and lip and oral cavity carcinoma: In univariable analysis, oral cancer cases who ate green salad one or more times per week were found to have significantly lower log2[solCD44] levels than those who ate salad less frequently (1.73 vs. 2.25, p = 0.014, which corresponds to solCD44 values of 3.32 versus 4.76 ng/mL, respectively) (Supplemental Table S1), suggesting that CD44 levels may vary with differences in risk such as salad intake.