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Study details
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A Phase I/II Study to Investigate the Safety, Tolerability, PK, and Preliminary Efficacy of FB849

1ST Biotherapeutics, Inc.
NCT IDNCT05761223ClinicalTrials.gov data as of Apr 2026
Phase

Phase 1/2

Target enrollment

151

Study length

about 2.9 years

Ages

18+

Locations

5 sites in OH, TX, VA +1

What this study is about

Researchers are testing a new drug called FB849 in people with advanced solid tumors who don't have other treatment options. The trial will evaluate how safe and well-tolerated FB849 is, as well as its effects on the body (pharmacokinetics) and whether it shows any signs of working (preliminary efficacy).

Simplified from trial records by PatientMatch.

What you may be asked to do

  • 1.Take Phase IIb dose-escalation part of FB849 in Combination with Pembrolizumab
  • 2.Take Phase IIb dose-expansion part of FB849 in Combination with Pembrolizumab (Type A cancer)
  • 3.Take Phase IIb dose-expansion part of FB849 in Combination with Pembrolizumab (Type B cancer)
  • +3 more

Participation Burden

What's physically and logistically required of participants.

Logistics & Travel
In-person visits

Requires travel to a study site

Physical Intervention
Injection / IV

How treatment is administered

Treatment Assignment
All receive treatment

Everyone gets the investigational treatment.

Extracted study details

Pulled from the trial record to show what is being tested and what the study is measuring.

Drug classes

pembrolizumab (Immune checkpoint inhibitor; blocks PD-1 to boost T-cell attack on cancer)

Drug routes

infusion

Endpoints

Primary: To assess the safety and tolerability of FB849 and to identify maximum tolerated dose (MTD)/ recommended Phase II dose (RP2D) and dosing schedule of FB849 in subjects with advanced solid tumors

Secondary: To determine the pharmacokinetic parameters such as Peak Plasma Concentration (Cmax) of FB849

Body systems

Oncology