<i>ABCG2</i> mRNA levels x 10⁷ in intestinal tissues normalised to 18S RNA levels

a P-values for comparison of the expression levels in tissue from healthy individuals adjusted for age and gender. b P value for the comparison of the expression levels in morphologically unaffected and affected tissue from the same individual using Paired Student’s t-test. Matching samples were available from 66 cases with mild-moderate dysplasia, 11 cases with severe dysplasia, and 80 and 83 CRC cases (distant unaffected tissue, and adjacent unaffected tissue, respectively. ABCG2 mRNA levels x 107 in intestinal tissues normalised to 18S RNA levels