The results showed no significant correlations of the different S100 protein forms with tumor variables, except for S100A6 (isoform b) and S100A13 correlating with Ki67 (p = 0.043; p = 0.041) and for S100A11 (isoform a) correlating with nodal status (p = 0.021). Here, S100A13 is linked to neoplasm.