GAP43 and carpal tunnel syndrome: GAP-43 gene expression levels (median normalised log2 counts CTS pre 4.01 [IQR 0.30], CTS post 4.02 [0.32], Wilcoxon p = 0.983, Fig 3A) and GAP-43 expressed as a percentage of PGP9.5 gene expression (median percentage CTS pre, 47.7 [IQR 3.3] CTS post 47.7 [3.7], Fig 3B, Wilcoxon p = 0.974) were comparable in patients before and after surgery.