LOS ANGELES--(BUSINESS WIRE)--ProNAi Therapeutics, Inc., a biopharmaceutical company pioneering a new class of nucleic-acid drugs based on DNA interference (DNAi®), today announced that its lead oncology therapeutic candidate, PNT2258, has successfully demonstrated preclinical in vivo efficacy in xenograft mice for a number of human cancers – including curative events for difficult-to-treat Burkitt’s Lymphoma.