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FLX475

Phase 2

Gastric Cancer | Small molecule | Oncology |Merck & Company, Inc.|Last Updated: Sep 25, 2025

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDBiomarker
Total Trials1
Total Enrollment20

FDA Designations

No designations recorded

Clinical trial landscape

FLX475 · 1 trial · 1 indication

Phase 2 1
NCT04768686FLX475 Combined With Pembrolizumab in Patients With Advanced or Metastatic Gastric CancerGastric Cancer
COMPLETED20 Analytics
PHASE2COMPLETED
FLX475 Combined With Pembrolizumab in Patients With Advanced or Metastatic Gastric Cancer
Gastric CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Overall Response Rate (ORR) in Subjects Treated With FLX475 in Combination With Pembrolizumab
Initial assessment performed after the first 2 cycles, then every 2 cycles for the first year, followed by every 3 cycles thereafter for up to 2 years and at any time per investigator's discretion and at ED/EOT, up to 2 years.

The primary efficacy endpoint is Objective Response Rate (ORR) defined as the proportion of subjects whose confirmed best overall response is either Complete Response (CR) or Partial Response (PR) according to RECIST version 1.1. For the efficacy endpoints (such as ORR and DCR), frequency and percentage of subjects who have achieved a response will be summarized by cohort and 95% 2-sided confidence interval will be calculated by Clopper-Pearson method.

Secondary Endpoints

Disease Control Rate (DCR) in Subjects Treated With FLX475 in Combination With Pembrolizumab
Initial assessment performed after the first 2 cycles, then every 2 cycles for the first year, followed by every 3 cycles thereafter for up to 2 years and at any time per investigator's discretion and at ED/EOT, up to 2 years.
Time to Response (TTR) in Subjects Treated With FLX475 in Combination With Pembrolizumab
Initial assessment performed after the first 2 cycles, then every 2 cycles for the first year, followed by every 3 cycles thereafter for up to 2 years and at any time per investigator's discretion and at ED/EOT, up to 2 years.
Duration of Response (DoR) in Subjects Treated With FLX475 in Combination With Pembrolizumab
Initial assessment performed after the first 2 cycles, then every 2 cycles for the first year, followed by every 3 cycles thereafter for up to 2 years and at any time per investigator's discretion and at ED/EOT, up to 2 years.
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
FLX475 and pembrolizumab combination therapyEXPERIMENTAL* Cohort 1: EBV negative / CPI naïve gastric cancer patient who has had a disease progression after at least 2 prior systemic treatments for advanced or metastatic gastric cancer * Cohort 2: EBV positive / CPI naïve gastric cancer patient (as determined by standard methods, e.g. EBER ISH or LMP-1 IHC) who had at least 1 prior systemic treatment for advanced or metastatic gastric cancer

Interventions

NameTypeDescription
FLX475DRUGtablet
PembrolizumabDRUGIV infusion
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites10

Inclusion Criteria: * All patients must have histologically or cytologically confirmed, advanced, relapsed or metastatic gastric or gastroesophageal junction adenocarcinoma * Patient must have one of the following diagnoses to be eligible for enrollment into cohorts: * Cohort 1: Checkpoint inhib...

Countries:South Korea
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Competitive Landscape -Gastric Cancer 112 trials

Top 20 of 45 competitors

CompanyTickerTrialsLead PhaseDrugs
AstraZeneca PLCAZN16PHASE3AZD0901, Ramucirumab, paclitaxel, Paclitaxel, Docetaxel
BeOne Medicines Ltd. Sponsored ADRONC4PHASE3Tislelizumab, Cisplatin, Leucovorin, 5-fluorouracil, Oxaliplatin
Jazz Pharmaceuticals Public Limited CompanyJAZZ3PHASE3Zanidatamab, Tislelizumab, Trastuzumab, Capecitabine, Oxaliplatin
Arcus Biosciences, Inc.RCUS2PHASE3Domvanalimab, Zimberelimab, Capecitabine, Fluorouracil, Leucovorin
Bristol-Myers Squibb CompanyBMY6PHASE2Pumitamig, Folfox, Capox, Nivolumab
Pfizer Inc.PFE7PHASE2disitamab vedotin, tucatinib
Agenus Inc.AGEN2PHASE3Balstilimab, Botensilimab, Folfox Protocol, XELOX, Nivolumab
AbbVie, Inc.ABBV2PHASE2Telisotuzumab Adizutecan, Budigalimab, Fluorouracil, Leucovorin, Oxaliplatin
Eli Lilly and CompanyLLY2PHASE2Ramucirumab, Paclitaxel
Compass Therapeutics, Inc.CMPX1PHASE2CTX-009, Paclitaxel
ALX Oncology Holdings, Inc.ALXO1PHASE2Evorpacept, Trastuzumab, Ramucirumab, Paclitaxel
GE Healthcare Technologies Inc.GEHC1PHASE2GEH300079 Positron-Emission Tomography/Computed Tomography
ImmunityBio IncIBRX1PHASE2N-803, Pembrolizumab
Apollomics Inc. Class AAPLM1PHASE2APL-101
Exelixis, Inc.EXEL2PHASE1cabozantinib, atezolizumab
Tango Therapeutics, Inc.TNGX2PHASE2Trifluridine/Tipiracil, Oxaliplatin, FOLFOX regimen, Nivolumab
Inhibrx Biosciences, Inc.INBX1PHASE1INBRX-106- Hexavalent OX40 agonist antibody, pembrolizumab, Carboplatin AUC-5, Pemetrexed/m2, Cisplatin/m2
Incyte CorporationINCY1PHASE2Capecitabine, Oxaliplatin, Retifanlimab
I-Mab Biopharma US LimitedIMAB2PHASE2Givastomig, Nivolumab, 5Fluorouracil, Leucovorin, Oxaliplatin
Enliven Therapeutics, Inc.ELVN1PHASE1ELVN-002, Trastuzumab, 5-Fluorouracil, Oxaliplatin, Capecitabine
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Frequently asked questions about FLX475

What is FLX475 used for in gastric cancer?

FLX475 is an investigational small molecule being studied for the treatment of gastric cancer. It is being evaluated in combination with pembrolizumab in patients with advanced or metastatic gastric cancer. The drug is currently in Phase 2 clinical development and is not yet approved by regulatory authorities.

Who makes FLX475?

FLX475 is being developed by Merck & Company, Inc., which trades under the ticker symbol MRK. The company is conducting clinical trials to evaluate the drug's safety and efficacy in patients with gastric cancer.

What phase is FLX475 in?

FLX475 is in Phase 2 clinical development. A Phase 2 trial has been completed, which studied the drug in combination with pembrolizumab in patients with advanced or metastatic gastric cancer. The drug remains investigational and has not received regulatory approval.

What clinical trials is FLX475 in?

FLX475 has been studied in one clinical trial, identified as NCT04768686. This Phase 2 trial evaluated FLX475 combined with pembrolizumab in patients with advanced or metastatic gastric cancer. The trial was conducted in South Korea and enrolled 20 participants aged 18 years and older.

Is FLX475 FDA approved?

FLX475 is not FDA approved. It is an investigational drug currently in Phase 2 clinical development for gastric cancer. A completed Phase 2 trial has evaluated the drug, but it has not yet received regulatory approval for any indication.

Is FLX475 a targeted therapy?

FLX475 is a small molecule being studied in a biomarker-selected patient population with gastric cancer. The Phase 2 trial enrolled patients with advanced or metastatic disease, and the study was designed to evaluate the drug's effects in this specific group.