Figure 1a shows the expression of all mammalian chitinases within the tumor tissue. CHI3L1 and CHID1 showed the highest expression, while the expression of CHI1 and CHI3L2 was only moderate. The expression levels of OVGP1 and CHIA were very low and, especially in the case of CHIA, mostly below the detection limit. Next, we correlated the expression of the chitinases with the patients’ survival (Figure 1b–f). In contrast to all other chitinases, only the expression of CHI3L1 correlated with a significantly increased survival (Figure 1b). This evidence concerns the gene CHI3L1 and neoplasm.