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REGNBullishIndustry Newsnews
High materiality8/10

Regeneron's ubamatamab shows strong LGSOC signals with FDA-facing path

Oct 1, 2026, 12:32 PM EDT1 sourcesAI-analyzed
Why it may matterVerify against the original reporting

Strong early efficacy signal (73% ORR) in a difficult-to-treat cancer, plus an announced path to registrational trials and FDA discussions; could re-rate REGN's oncology pipeline despite small sample size and early-phase nature.

AI summary

What happened, with direct paths to the underlying reporting

Regeneron disclosed early Phase 1/2 ubamatamab data in low-grade serous ovarian cancer (LGSOC) at IGCS 2026, including 800 mg monotherapy achieving 73% ORR and 11-month PFS in 11 patients. The dedicated LGSOC cohort is expanding toward a registrational path, with FDA discussions and a planned Phase 3 trial, highlighting potential first-in-class activity against a limited-treatment cancer.

  • Ubamatamab 800 mg monotherapy in LGSOC: 73% ORR, 11-month PFS in 11 patients.
  • Phase 1/2 data from IGCS; dedicated LGSOC cohort, registrational path planned, FDA discussions upcoming.
  • Safety: TEAEs in 100% of patients; CRS 90% (Grade 1/2); no treatment-related deaths.
  • LGSOC is a niche, younger-patient cancer with limited options and high unmet need.
  • Regeneron aims for a confirmatory Phase 3 trial; potential first-in-class MUC16xCD3 bispecific.

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