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RecruitingInterventionalPhase 1

A Phase 1, Open-label, Multicenter, Dose Escalation Study Evaluating the Safety, Tolerability, Pharmacokinetics and Efficacy of KQB168 as Monotherapy and in Combination With Pembrolizumab in Participants With Advanced Solid Malignancies

NCT ID: NCT06994806Sponsor: Kumquat Biosciences Inc.Last updated: 2026-03-03

Summary

The goal of this clinical trial is to learn if KQB168 works to treat advanced solid tumor cancer in adults. It will also learn about the safety of KQB168. The main questions it aims to answer are: * What is the safe dose of KQB168 by itself or in combination with pembrolizumab? * Does KQB168 alone or in combination with pembrolizumab decrease the size of the tumor? * What happens to KQB168 in the body? Participants will: * Take KQB168 daily, alone or in combination with pembrolizumab * Visit the clinic about 8 times in the first 8 weeks, and then once every 3 weeks after that

Arms & interventions

  • DrugKQB168

    Oral KQB168

  • DrugPembrolizumab

    Intravenous pembrolizumab

Outcome measures

Primary

  • Number of patients who experience treatment-emergent adverse events (AEs), serious adverse events (SAEs), and dose-limiting toxicities (DLTs)

    Safety characterized by type, incidence, severity, timing, seriousness and relationship to study treatment of AEs, SAEs, and DLTs, from first dose of study treatment to 30 days after last dose of study treatment.

    Time frame: up to 36 months

Secondary

  • Overall response rate (ORR)

    Time frame: up to 36 months

  • Duration of response (DOR)

    Time frame: up to 36 months

  • Time to response (TTR)

    Time frame: up to 36 months

  • Disease control rate (DCR)

    Time frame: up to 36 months

  • Progression-free survival (PFS)

    Time frame: up to 36 months

  • Overall survival (OS)

    Time frame: up to 36 months

  • Concentration-time curve (AUC)

    Time frame: up to 36 months

  • Maximum plasma concentration (Cmax)

    Time frame: up to 36 months

  • Time to maximum plasma concentration (tmax)

    Time frame: up to 36 months

  • Pharmacologically Active Dose (PAD)

    Time frame: up to 36 months

Eligibility criteria

Sex: AllAge: 18 Years and olderHealthy volunteers: No
Inclusion Criteria: * Histologically confirmed diagnosis of solid tumor malignancy. * Unresectable or metastatic disease that has progressed on immunotherapy. * No available treatment with curative intent * Adequate organ function * Measurable disease per RECIST v1.1 Exclusion Criteria: * Active primary central nervous system tumors * Cardiac abnormalities * History of lung diseases * Any condition that may impair drug absorption or prevent oral dosing * Known history of immune-mediated colitis and uncontrolled autoimmune diseases

Study locations (15)

Mayo Clinic - Phoenix

Phoenix, Arizona, 85054

Recruiting

USC Norris Comprehensive Cancer Center

Los Angeles, California, 90033

Recruiting

Sarah Cannon Cancer Institute at HealthONE

Denver, Colorado, 80218

Recruiting

Yale Cancer Center- New Haven

New Haven, Connecticut, 06520

Recruiting
Priscilla Steve · Contact

Mayo Clinic - Jacksonville

Jacksonville, Florida, 32224

Recruiting
Kendal Klein · Contact

Florida Cancer Specialists - Sarasota

Sarasota, Florida, 34232

Recruiting

University of Iowa

Iowa City, Iowa, 52242

Recruiting
Jennifer Adams · Contact

Mayo Clinic - Rochester

Rochester, Minnesota, 55905

Recruiting
Siobhan Chantigian · Contact

Cleveland Clinic

Cleveland, Ohio, 44195

Recruiting
Heather Keaney · Contact

NEXT Austin

Austin, Texas, 78758

Recruiting
Heather Watson · Contact

Mary Crowley Cancer Research Centers

Dallas, Texas, 75230

Recruiting

UT MD Anderson Cancer Center - Houston

Houston, Texas, 77030

Recruiting
Anupama Madhyannapu · Contact

NEXT Huston

Houston, Texas, 77054

Recruiting

NEXT Oncology

San Antonio, Texas, 78229

Recruiting

NEXT Virginia

Fairfax, Virginia, 22031

Recruiting
Referral Coordinator · Contact