CA9 and cancer: For instance, the CA9 (carbonic anhydrase IX) that should be expressed only in ccRCC [88,89] was found by us to be expressed not only in the cancer nodules (AVE(PTA) = 2.11, AVE(PTB) = 0.27, AVE(CWM) = 2.65) but also in the NOR (AVE(NOR) = 2.76).