Biotechnology California, USA-based OncoSec Medical, a company developing intratumoral cancer immunotherapies, saw its shares leap 32% in pre-market trading after it announced a collaboration with Duke University School of Medicine to evaluate the use of OncoSec's proprietary TAVOPLUS (enhanced interleukin (IL)-12 DNA-plasmid) in combination or sequence with a HER2-plasmid vaccine administered with OncoSec's novel intratumoral delivery system. 17 April 2019