Compugen (CGEN) Reports Updated Data from Phase 1 Study of COM701, First- in-Class Anti-PVRIG

June 8, 2021 7:08 AM EDT

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Compugen Ltd. (NASDAQ: CGEN) a clinical-stage cancer immunotherapy company and a leader in predictive target discovery, presented updated data from its Phase 1 dose escalation and expansion study of COM701 as a monotherapy, and in a dose escalation combination study with Opdivo® (nivolumab) in an oral presentation at the ASCO 2021 Annual Meeting, being held virtually on June 4-8, 2021. COM701 is a first-in-class investigational therapeutic antibody targeting PVRIG, a novel immune checkpoint discovered computationally by Compugen.

"These new data from our COM701 clinical program are meaningful for two key reasons," said Anat Cohen-Dayag, Ph.D., President and CEO of Compugen. "First, durability data show multiple patients on treatment beyond one year, strengthening our confidence that PVRIG blockade through COM701 may provide meaningful clinical benefit in tumor types typically unresponsive to immune checkpoint inhibitors, including in patients with prior progression on these treatments. Our ongoing confirmed complete response from the combination arm is particularly noteworthy given it was achieved in a patient with anal squamous cell carcinoma with prior progression on Opdivo® and is on study treatment now out to 22 months. We believe these results support our hypothesis that dual blockade of PVRIG and PD-1 may be key to driving immune responses in certain patient populations."

Dr. Cohen-Dayag continued, "Second, preliminary biomarker data provide important insights into the mechanism of COM701 immune activation. A trend of increased peripheral immune cell proliferation of CD8+ effector memory T cells and NK-T cells was observed in the monotherapy and combination arms. In addition, increased levels of the key antitumor cytokine IFNγ, observed with increasing doses of COM701, suggest that the demonstrated immune activity is derived from the combination regimen and not the effect of Opdivo® alone. Furthermore, our biomarker data suggest that COM701 as monotherapy, and in combination with Opdivo®, has the potential to drive durable clinical activity in patients with PD-L1 low, PVRL2 positive tumors. Specifically, data obtained from an archival biopsy of a primary peritoneal cancer patient support this, showing that COM701 monotherapy has the potential to drive tumor shrinkage and increased peripheral proliferation of immune cell subsets and IFNγ secretion in a patient with an immune desert, non-inflamed tumor microenvironment. Together, these clinical and preliminary biomarker results provide an important foundation of data that are supportive of our DNAM axis hypothesis, which we are evaluating comprehensively in the clinic across monotherapy, dual and triple combination studies."

Daniel Vaena M.D., Director of Experimental Therapeutics Program at West Cancer Center Research Institute (Memphis, TN), said, "Although these results are very preliminary, they suggest that targeting PVRIG may extend the benefit of immunotherapy to patient populations and tumor types which are typically unresponsive to existing immunotherapy agents. Achieving durable responses in patients with progression on immune checkpoint inhibitors is encouraging and speaks to the potential of this novel immune checkpoint inhibitor to improve clinical outcomes for patients with significant unmet medical need."

Data highlights with a cut-off of April 15 2021 from the presentation titled, "COM701 with or without nivolumab: Results of an ongoing Phase 1 study of safety, tolerability and preliminary antitumor activity in patients with advanced solid malignancies", presented by Daniel Vaena, M.D., West Cancer Center Research Institute, include:

COM701 and Opdivo® combination arm dose escalation:

  • In 15 evaluable patients, COM701 in combination with Opdivo® was well-tolerated with no reported dose-limiting toxicities up to the fifth and final dose cohort of COM701 20 mg/kg and Opdivo® 480 mg, both IV Q4 weeks.
  • The disease control rate (DCR) was 66.7% (N=10) with best responses of complete response (CR) 6.7% (N=1), partial response (PR) 6.7% (N=1) and stable disease (SD) 53.3% (N=8).
  • Previously reported patient with anal squamous cell carcinoma with confirmed CR remains on treatment at 96 weeks (22 months). This patient had three prior lines of therapy and enrolled within one month after progression on Opdivo® monotherapy.
  • Previously reported patient with renal cell carcinoma with best response of SD remains on treatment at 75 weeks.
  • A patient with microsatellite stable (MSS)-colorectal cancer with durable confirmed partial response previously reported at AACR 2020 remained on study treatment for 44 weeks.

COM701 monotherapy arm:

  • Overall 36 patients enrolled. 16 patients, all comers in dose escalation and 20 patients in dose expansion; four patients of each: endometrial cancer, NSCLC, ovarian cancer, breast cancer and colorectal cancer (MSS).
  • The disease control rate (DCR) was 47.2% (N=17) with best responses of partial response (PR) 2.7% (N=1) and stable disease (SD) 44.4% (N=16).
  • Previously reported patient with primary peritoneal cancer (platinum resistant, MSS) with confirmed PR remains on study treatment at 79 weeks (18 months). Patient had three prior lines of standard-of-care treatment.- Archival pre-treatment biopsy data revealed the patient was PD-L1 negative, with PVRL2 expression on tumor and endothelial cells, with an immune desert phenotype (i.e, no immune cells detected prior to treatment).- Peripheral blood assessment showed immune activation as measured by immune cell proliferation and IFNγ induction prior to tumor shrinkage.

Demonstrated durable antitumor activity in extensively pretreated population:

  • Durable responses to treatment (CR, PR or SD 6 months) in 10/51 (19%) patients.
  • Best responses of CR, PR, or SD were observed in 11/21 (52%) patients with prior treatment refractory disease.
  • Best response of CR, PR or SD were observed in 13/18 (72%) patients with prior treatment with immune checkpoint inhibitors.

Preliminary biomarker results demonstrate immune activation with COM701 treatment:

  • Peripheral pharmacodynamic changes were measured via immune cell proliferation and cytokine levels in peripheral blood before and on treatment.
  • After one treatment cycle, patients treated with COM701 monotherapy showed a trend of increased proliferation of effector memory CD8+ T cells (average change 87%), an immune cell population that expresses high level of PVRIG and are critical in driving anti-tumor immunity. Similar results were observed in the combination arm.
  • Proliferation of NK-T cells, an immune cell population that expresses high level of PVRIG and plays a role in antitumor activity, increased significantly one day after COM701 monotherapy treatment, with a similar trend observed in the combination arm.
  • Levels of IFNγ, a cytokine which plays a key role in antitumor immunity, were upregulated following combination treatment of COM701 with Opdivo®, with a dose response trend with increasing doses of COM701, suggesting the observed activity is derived from the combination treatment and not Opdivo® alone.
  • Anti-tumor activity was observed in PD-L1 low, PVRL2 positive patients, suggesting COM701 treatment may drive anti-tumor immunity even in patients with less inflamed tumor microenviroment.

The presentation presented at the ASCO 2021 Annual Meeting can be found at the Company's website and is not considered a part of this press release.

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