RTN4IP1 and B-cell non-Hodgkin lymphoma: Indeed, the BLV provirus in BLV-induced B-cell lymphoma line BLSC-KU1 is integrated at a single site in the intron of the regulatory-associated protein of mTOR (RPTOR) gene, whereas in other B-cell lymphoma line BLSC-KU17, it is integrated at a single site in the intergenic region between RTN4IP1 and ATG5 [14].