Company News

Polaris Group Announces Positive Top-Line Results from Phase 2/3 ATOMIC study in Patients with Malignant Pleural Mesothelioma to Assess ADI-PEG 20 with Pemetrexed and Cisplatin

Polaris Group Announces Positive Top-Line Results from Phase 2/3 ATOMIC study in Patients with Malignant Pleural Mesothelioma to Assess ADI-PEG 20 with Pemetrexed and Cisplatin

  • Phase 2/3 ATOMIC study met its primary endpoint with statistically significant improvement in Overall Survival
  • Study also met key secondary endpoint showing statistically significant improvement for ADI-PEG 20 Group vs. Control Group in Progression Free Survival and ADI-PEG20 had safety profile similar to that observed in previous trials
  • Data will be submitted to health authorities globally, including the U.S. Food and Drug Administration and European Medicines Agency

  TAIPEI, Taiwan and SAN DIEGO, Calif., September 21, 2022 — Polaris Group (TWSE: 6550), a multinational biopharmaceutical company focused on research and development of novel biological drugs for cancer and other metabolic diseases, today announced top-line efficacy and safety data from the Phase 2/3 ATOMIC Study, a global, multi-center, randomized, double-blind, placebo-controlled trial of ADI-PEG 20 in combination with Pemetrexed and Cisplatin in patients with unresectable Malignant Pleural Mesothelioma (MPM) with biphasic or sarcomatoid histology. The ATOMIC trial demonstrated that patients randomized to the combination of ADI-PEG 20 plus cisplatin and pemetrexed had a median OS of 9.3 months ( 95% confidence interval [CI], 7.85-11.79), versus 7.66 months (95% confidence interval [CI]:6.14-9.53) for the placebo plus cisplatin and pemetrexed control arm. (hazard ratio [HR]=0.71; 95% CI, 0.55-0.93; p=0.0234). The difference in the primary efficacy endpoint of Overall Survival (OS) is statistically significant.

  ATOMIC also met its secondary endpoint, showing statistically significant median Progression Free Survival (PFS) of 6.11 (95% confidence interval [CI], 5.75-7.43) months for ADI-PEG20 group and 5.59 months (95% confidence interval [CI], 4.14-5.85) for the placebo control arm. (hazard ratio [HR]=0.65; 95% CI, 0.47-0.90; p-value=0.0159.) The safety profile of ADI-PEG 20 observed in ATOMIC was similar to that of the previous clinical trial. Given these results, Polaris Group will proceed with regulatory submissions in the United States in 2023. In 2022, ADI-PEG 20 received fast track designation from the FDA.

  “We are pleased to report the Phase 2/3 data showing that ADI-PEG 20 can significantly extend overall survival in patients with MPM. ADI-PEG 20 is the first arginine-degrading therapeutic to show positive topline results in a pivotal trial as a combination therapy for the treatment of MPM”, said Howard Chen, chairman of Polaris Group. “The results pave the way towards our working with the regulators to bring this novel biologic to patients with MPM”.

  “As this study evaluates a new mechanism of action to treat cancer, having endpoints reach statistical significance is a remarkable finding. We plan to accelerate our pipeline projects and expand to other indications leveraging this unique mechanism of action to starve cancer cells by making use of combination with other chemotherapy and radiation. Polaris Group is extremely grateful for the invaluable contributions of all of the study’s participants, their families and caregivers, and the clinical investigators.”, said Shaw Chen, M.D., Ph.D., chief executive officer of Polaris Group.

About ADI-PEG 20

ADI-PEG 20 is a biologic being developed by Polaris Group to treat cancers. Because arginine is one of the 20 amino acids that are essential for protein synthesis and survival of cells, some cancer cells become dependent upon the external supply of arginine to survive and grow. ADI-PEG 20 is designed to deplete the external supply of arginine, which causes arginine-dependent cancer cells to die while leaving the patient’s normal cells unharmed. Multiple cancers have been reported to have a high degree of arginine dependency.

About the ATOMIC trial

ATOMIC is a randomized, double-blind, placebo-controlled global pivotal Phase II/III Study evaluating ADI-PEG 20 (pegylated arginine deiminase), an arginine degrading enzyme versus placebo with cisplatin and pemetrexed as a first-line treatment in patients with malignant pleural mesothelioma (MPM).

The primary endpoint of the trial is OS. Secondary endpoints include progression-free survival (PFS), and safety.

About Polaris Group

Polaris Group is a multinational biotechnology company specializing in the research and development of novel pharmaceuticals to treat cancer. The company’s lead therapeutic, ADI-PEG 20, is a novel biologic in late stage clinical development. It has been tested in more than twenty clinical trials globally for a wide variety of cancers, including hepatocellular carcinoma, mesothelioma, pancreatic cancer, non-small cell lung cancer, melanoma, acute myeloid leukemia and others. As a fully integrated company, Polaris is engaged in applying protein structure-based drug design technology to develop novel drug candidates for cancers, conducting clinical studies at top-tier cancer centers worldwide, and manufacturing all clinical materials at its certified cGMP facilities in northern California.

For additional information please visit

Scroll to Top
This site is registered on as a development site.