OncoSec | 3,668 followers on LinkedIn. OncoSec is a biotechnology company pioneering new technologies to stimulate the body’s immune system to target and attack cancer. Through its proprietary DNA gene transfer technology, OncoSec seeks to deliver safer and more effective cancer treatments that can provide long-term benefits for patients who have limited or no available treatment options. OncoSec’s technology combines TAVO™ (tavokinogene telseplasmid), an intratumoral (IT) DNA plasmid-based interleukin-12 (IL-12) designed to achieve targeted and sustained delivery of IT IL-12.