Relative Cu(I) and Zn(II) levels and the Cu(I)/Zn(II) ratio estimated from the average MPEF from normal mucosa tissue and colon tumour tissues labelled with ACu1 and AZn1 median(min, max)
| Normal mucosa tissue | Tumour tissue | p Value* | |
| Cu(I) | 109 (52, 147) | 212 (171, 242) | <0.001 |
| Zn(II) | 190 (148, 234) | 109 (85, 130) | <0.001 |
| Cu(I)/Zn(II) | 0.588 (0.270, 0.782) | 1.962 (1.528, 2.719) | <0.001 |
↵* Comparisons made using the Wilcoxon signed ranks test.
MPEF, multi-photon excited fluorescence.