GDF9 and cancer: Deng, S. P. et al. [16] had identified “GDF9”, “CYP1A2”, “ATF7”, “TRPM3”, “CER1”, “PTPRJ”, “KCNIP1”, and “LRRC15” as hub genes in bladder cancer by construction and estimation of two DCNs(normal and cancer state) in 2015.