Furthermore, we observed that VDAC2P1 and VDAC3P1 are weakly expressed (range of 0.03–0.07 TPM) only in some normal connective tissues (i.e. tissues subject to sarcomas), although VDAC3P1 is also expressed in testicular germ cells (Additional file 9: Table S2). This evidence concerns the gene VDAC3P1 and sarcoma.