INHA and cancer: INHBA gene encodes the Inhibin βA homodimer of Activin A. Genes encoding related protein subunits, such as INHBB, INHBC, INHBE, and INHA, are not overexpressed in cancers (Supplementary Fig. 1), suggesting that upregulation of INHBA in cancer leads to increased production of Activin A (a homodimer of two Inhibin βA subunits) but not of Inhibin A (a heterodimer of Inhibin βA and Inhibin α subunits) or of other heterodimeric proteins containing the Inhibin βA subunit (Supplementary Fig. 1).