Export adapter involved in mRNA nuclear export in cancer cells. Binds and enhances the RNA-binding activity of the nuclear RNA export factor NXF1. Can restore mRNA export function in cells compromised by loss of mRNA export adapters (PubMed:25662211). Interacts NXF1, NXF2, THOC1, THOC5, DDX39B/UAP56 and SRRT. In nuclear speckles. Relocalizes to the cytoplasm during cell division. Expressed specifically in testis. Also expressed in a wide variety of cancer types, but particularly high levels of expression observed in melanoma cells.