PPP1R21 and neoplasm: By real-time qPCR, we further examined the expression of selected genes (Pkm, Ppp1r13l, Vamp3, Ctnnb1, Tbc1d4, Ppp1r21, C1qtnf9, Fgf3 and Efemp2) that are known to be involved in the tumor development or potentially relevant for establishment of malignant transformation.