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REGNRegeneron PharmaceuticalsSigning up patients

A Trial to Find Out if REGN5678 (Nezastomig) is Safe and How Well it Works Alone or in Combination With Cemiplimab for Adult Participants With Metastatic Castration-Resistant Prostate Cancer and Other Tumors

Metastatic Castration-Resistant Prostate Cancer (mCRPC) · Clear Cell Renal Cell Carcinoma (ccRCC)

5Calmworry score, out of 100

No strong warning signs right now. The score counts warning signs; it is not a prediction.

Why this score

  • 5 insiders sold shares within a month

    Since Nov 4, 2026 · was worth 5, fading over time

    +4.8
Worry score5

Score over time

Stage
Phase 1/2
Patients
345 (planned)
Started
Aug 12, 2019
Main results expected
Nov 15, 2027
Fully finished
Nov 15, 2027
Results posted
not yet

What counts as success

The trial's main goal(s), called the “primary outcome.”

  • Incidence and severity of Treatment-Emergent Adverse Events (TEAEs)

    Measured over: Through study completion, up to 5 years

  • Incidence and severity of Adverse Event of Special Interests (AESIs)

    Measured over: Through study completion, up to 5 years

  • Incidence and severity of Serious Adverse Events (SAEs)

    Measured over: Through study completion, up to 5 years

  • Number of participants with Grade ≥3 laboratory abnormalities

    Measured over: Through study completion, up to 5 years

  • Incidence of Dose-Limiting Toxicities (DLTs)

    Measured over: First dose through day 42 of last participant in each dose level

  • Concentration of REGN5678 in serum over time

    Measured over: Through study completion, up to 5 years

  • Concentration of REGN5678 in combination with cemiplimab in serum over time

    Measured over: Through study completion, up to 5 years

  • Composite Response Rate (CRR) of 50% decline of Prostate Specific Antigen (PSA) and/or confirmed radiographic response of complete (CR) or partial response (PR)

    Measured over: Through study completion, up to 5 years

  • Objective Response Rate (ORR) per Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 criteria

    Measured over: Through study completion, up to 5 years

Changes Tremor has spotted

No changes since Tremor started watching this trial.
Show details (technical version)

Score inputs

  • insider_selling_cluster: base 5, now 4.8, since 2026-11-04, fades (half-life)

Raw record changes

  • none yet

Trial ID NCT03972657 · record last updated 2026-11-04 · checked 2026-11-09 15:47 UTC

See the official record on ClinicalTrials.gov (NCT03972657) ↗