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Fennec Pharmaceuticals Announces Positive Results from Clinical Study in Japan

Fennec Pharmaceuticals Inc. (FENC) | December 2, 2025

By Charlie Brown

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Fennec Pharmaceuticals announced positive topline results from the investigator-initiated Phase 2/3 STS-J01 clinical trial in Japan.

The study evaluated PEDMARK for reducing cisplatin-induced ototoxicity in pediatric and adolescent patients with solid tumors.

Results showed a significant reduction in hearing loss in patients who received PEDMARK compared to those receiving cisplatin alone.

Primary Endpoint Met

Significant reduction in hearing loss in 3-18 year old patients with PEDMARK versus historically reported rates with cisplatin alone.

No Interference with Antitumor Activity

Approximately 95% clinical response rate with no interference observed.

Future Plans

Fennec intends to pursue registration and explore partnership opportunities for PEDMARK in Japan based on these results.

  • The study demonstrated lower rates of hearing loss in real-world settings in Japan, reinforcing PEDMARK's protective effect.
  • Pharmacokinetic analyses showed no reduction in cisplatin exposure and no adverse interaction with antitumor activity.
  • Results offer confidence in PEDMARK's efficacy and safety for cancer patients in Japan, addressing an unmet medical need.

The positive results from the STS-J01 study highlight the potential of PEDMARK in reducing cisplatin-induced hearing loss and maintaining antitumor activity. Fennec Pharmaceuticals aims to further advance registration and collaboration opportunities for the drug in Japan.