First patient enrolled in Phase II trial of ImmunoPulse IL-12 and pembrolizumab combination therapy

OncoSec Medical Incorporated ("OncoSec") (NASDAQ: ONCS), a company developing DNA-based intratumoral cancer immunotherapies, today announced enrollment of the first patient into the Phase II Investigator Sponsored Trial led by the University of California, San Francisco (UCSF) to assess the anti-tumor activity, safety, and tolerability of the combination of OncoSec's investigational therapy, ImmunoPulse™ IL-12, and Merck's approved anti-PD-1 agent, KEYTRUDA^® (pembrolizumab), in patients with unresectable metastatic melanoma. The primary endpoint is the best Overall Response Rate (bORR) of the combination regimen in patients whose tumors are characterized by low numbers of tumor-infiltrating lymphocytes (TILs).

"There is increasing evidence that tumors need to be inflamed and have TILs in order for anti-PD-1 therapies to be most effective," said Mai H. Le, MD, Chief Medical Officer of OncoSec. "Both preclinical and clinical evidence suggest that ImmunoPulse™ IL-12 can promote tumor immunogenicity. We anticipate that ImmunoPulse™ IL-12 will increase the proportion of patients who will respond to immune checkpoint inhibitors like KEYTRUDA^® and that the combination will have synergistic anti-tumor activity."

"This is the first study in the field of immuno-oncology to evaluate the combination of DNA-based interleukin-12 with electroporation and an anti-PD-1/PD-L1 inhibitor," said Punit Dhillon, CEO and President of OncoSec. "We believe the combination of OncoSec's intratumoral cancer immunotherapy and checkpoint inhibitors has the potential to be a powerful approach in the fight against cancer."

This multi-center, open label, single-arm trial will enroll approximately 42 patients with unresectable, "low-TIL" metastatic melanoma. Alain Algazi, MD, a skin cancer specialist in the Melanoma Center at the UCSF Helen Diller Family Comprehensive Cancer Center, is the study's sponsor and principal investigator. The key endpoints of the study include: best Overall Response Rate by RECIST v1.1 and immune related-Response Criteria (irRC); safety and tolerability; duration of response; 24-week landmark progression-free survival; median progression-free survival; and overall survival.

The treatment schedule for the trial follows the standard schedule for pembrolizumab. Pembrolizumab will be administered systematically once every three weeks and ImmunoPulse™ IL-12 will be administered on three separate days every six weeks. ImmunoPulse™ IL-12 employs intratumoral delivery of DNA-based IL-12 followed by electroporation. Merck will supply pembrolizumab, and OncoSec will provide ImmunoPulse™ IL-12.