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FLX475

Phase 1

Advanced Cancer | Small molecule | Oncology |RAPT Therapeutics, Inc.|Last Updated: Sep 3, 2026

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment323

FDA Designations

No designations recorded

Clinical trial landscape

FLX475 · 1 trial · 1 indication

Phase 1 1
NCT03674567Dose Escalation and Expansion Study of FLX475 Monotherapy and in Combination With PembrolizumabAdvanced Cancer
COMPLETED323 Analytics
PHASE1COMPLETED
Dose Escalation and Expansion Study of FLX475 Monotherapy and in Combination With Pembrolizumab
Advanced CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Safety and Tolerability of FLX475 as a Single Agent and in Combination With Pembrolizumab Measured by the Incidence of Adverse Events, Including Dose-limiting Toxicities and Maximum Tolerated Dose
Approximately 18 weeks

treatment-emergent adverse events

Overall Response Rate in Subjects Treated With FLX475 as a Single Agent and in Combination With Pembrolizumab
Through study completion (approximately 2 years)

Summary of Best Overall Response

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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part 1a: Monotherapy Dose EscalationEXPERIMENTALEligible subjects will be enrolled in sequential cohorts treated with successively higher doses of FLX475 as monotherapy.
Part 1b: Combination Dose EscalationEXPERIMENTALEligible subjects will be enrolled in sequential cohorts treated with successively higher doses of FLX475 in combination with pembrolizumab.
Part 2a: Monotherapy Expansion CohortsEXPERIMENTALEligible subjects will be initially enrolled in Stage 1 of parallel expansion cohorts of FLX475 as monotherapy; additional subjects in each cohort may be enrolled in Stage 2.
Part 2b: Combination Expansion CohortsEXPERIMENTALEligible subjects will be initially enrolled in Stage 1 of parallel expansion cohorts of FLX475 in combination with pembrolizumab; additional subjects in each cohort may be enrolled in Stage 2.

Interventions

NameTypeDescription
FLX475 (tivumecirnon)DRUGtablet
pembrolizumab (KEYTRUDA®)DRUGIV infusion
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites35

Inclusion Criteria: * Documented advanced or metastatic cancer ineligible for standard therapies with one of the following histologies * Dose Escalation: non-small cell lung cancer, head and neck squamous cell carcinoma, nasopharyngeal carcinoma, metastatic triple negative breast cancer, urothel...

Countries:United StatesAustraliaHong KongSouth KoreaTaiwanThailand
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Competitive Landscape -Cancer 5 trials (matched to "Advanced Cancer")

Frequently asked questions about FLX475

What is FLX475 used for in advanced cancer?

FLX475 is an investigational small molecule being studied for the treatment of advanced cancer. It is being evaluated as a monotherapy and in combination with pembrolizumab in patients with advanced cancer. The drug is in Phase 1 clinical development and is not yet approved by regulatory authorities.

What does FLX475 target?

FLX475 is a small molecule being developed for oncology. Its specific molecular target has not been disclosed in available clinical trial information. The drug is being studied for its potential role in treating advanced cancer, though its precise mechanism of action is not publicly detailed.

Who makes FLX475?

FLX475 is being developed by RAPT Therapeutics, Inc., a biopharmaceutical company. RAPT Therapeutics is listed on the stock exchange under the ticker symbol RAPT. The company is conducting clinical research on FLX475 for the treatment of advanced cancer.

What phase is FLX475 in?

FLX475 is currently in Phase 1 clinical development. It has completed a Phase 1 trial that evaluated the drug as a monotherapy and in combination with pembrolizumab. The drug remains investigational and has not received approval from the U.S. Food and Drug Administration or other regulatory bodies.

What clinical trials is FLX475 in?

FLX475 has been studied in a completed Phase 1 clinical trial identified as NCT03674567. This trial was a dose escalation and expansion study of FLX475 monotherapy and in combination with pembrolizumab in patients with advanced cancer. The trial enrolled 323 participants across multiple countries.

Is FLX475 the same as pembrolizumab?

No, FLX475 is not the same as pembrolizumab. FLX475 is an investigational small molecule being developed by RAPT Therapeutics. Pembrolizumab is a separate, approved immunotherapy drug. In clinical trials, FLX475 has been studied both alone and in combination with pembrolizumab for advanced cancer.