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Lonsurf

Phase 2

Metastatic Colorectal Cancer | Small molecule | Oncology |Tango Therapeutics, Inc.|Last Updated: Dec 10, 2025

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDBiomarker
Total Trials1
Total Enrollment73

FDA Designations

No designations recorded

Clinical trial landscape

Lonsurf · 1 trial · 3 indications

Phase 2 1
NCT06245356Safety of Trifluridine/Tipiracil in Patients With Dihydropyrimidine Dehydrogenase Deficiency Diagnosed With Metastatic Colorectal or Gastroesophageal CancerMetastatic Colorectal Cancer
RECRUITING73 Analytics
PHASE2RECRUITING
Safety of Trifluridine/Tipiracil in Patients With Dihydropyrimidine Dehydrogenase Deficiency Diagnosed With Metastatic Colorectal or Gastroesophageal Cancer
Metastatic Colorectal CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Treatment specific safety
1 month

The percentage of patients without specific toxicities defined as grade 3-4-5 digestive toxicities (diarrhoea and/or stomatitis) and grade 4-5 neutropenia or febrile neutropenia over the first 2 cycles of first-line metastatic treatment. Toxicities will be graded using the National Cancer Institute-Common Terminology Criteria for Adverse Events version 5 (NCI-CTCAE v5), widely accepted in the community of oncology research as the leading rating scale for adverse events. This scale, divided into 5 grades (1 = "mild", 2 = "moderate", 3 = "severe", 4 = "life-threatening", and 5 = "death") determined by the investigator, will make it possible to assess the severity of the disorders.

Secondary Endpoints

Overall Safety
Throughout study completion, up to 2 years
Compliance with study treatment
1 month
Progression Free Survival
From baseline until disease progression or death, up to 2 years
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Colorectal adenocarcinomaOTHERTrifluridine/tipiracil in association with oxaliplatin with or without: * Panitumumab in RAS wild type tumors * Bevacizumab in RAS wild type of right colon or RAS mutated tumors
Gastroesophageal adenocarcinomaOTHERTrifluridine/tipiracil in association with oxaliplatin with or without: * Trastuzumab in HER2-positive tumors (3+ IHC or 2+/FISH+) * Nivolumab if CPS≥5 and HER2-negative tumors

Interventions

NameTypeDescription
LonsurfDRUGTrifluridine/tipiracil orally 35 mg/m²/dose (D1-D5 twice daily, D1=D15)
OxaliplatinDRUGOxaliplatin intravenous injection 85 mg/m² every 2 weeks (D1=D15)
PanitumumabDRUGPanitumumab intravenous injection 6 mg/kg (D1=D15)
BevacizumabDRUGBevacizumab intravenous injection 5 mg/kg (D1=D15)
TrastuzumabDRUGTrastuzumab intravenous injection 4 mg/kg (D1=D15)
NivolumabDRUGNivolumab intravenous injection 240 mg (D1=D15)
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites21

Inclusion Criteria: 1. Patient must have signed and dated a written informed consent form prior to any trial specific procedures. When the patient is physically unable to give their written consent, a trusted person of their choice, independent from the investigator or the sponsor, can confirm in w...

Countries:France
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Competitive Landscape -Colorectal Cancer 258 trials (matched to "Metastatic Colorectal Cancer")

Frequently asked questions about Lonsurf

What is the combination of Lonsurf and Irinotecan used for?

The combination of Lonsurf and Irinotecan is being studied for use in cholangiocarcinoma and metastatic colorectal cancer. It is an investigational small molecule combination in Phase 2 clinical development, evaluated in patients with these advanced gastrointestinal cancers.

What does the combination of Lonsurf and Irinotecan target?

The combination of Lonsurf and Irinotecan targets cancer cells through the mechanisms of trifluridine/tipiracil and irinotecan. Trifluridine is a thymidine-based nucleoside analog that incorporates into DNA, while irinotecan inhibits topoisomerase I, together disrupting cancer cell replication.

Who is developing the combination of Lonsurf and Irinotecan?

Tango Therapeutics, Inc. (NASDAQ: TNGX) is developing the combination of Lonsurf and Irinotecan. The company is conducting clinical trials to evaluate this combination in patients with cholangiocarcinoma and metastatic colorectal cancer.

What phase is the combination of Lonsurf and Irinotecan in?

The combination of Lonsurf and Irinotecan is in Phase 2 clinical development. It is investigational and not yet approved by regulatory authorities. Two Phase 2 trials are listed, one completed and one currently recruiting participants.

What clinical trials is the combination of Lonsurf and Irinotecan in?

The combination is studied in NCT04059562, a completed Phase 2 trial in cholangiocarcinoma, and NCT06245356, a recruiting Phase 2 trial in metastatic colorectal cancer and gastroesophageal cancer with DPD deficiency. Both are open-label, non-randomized studies.

Is the combination of Lonsurf and Irinotecan the same as Lonsurf?

The combination of Lonsurf and Irinotecan includes Lonsurf, which is the brand name for trifluridine/tipiracil. Lonsurf is one component of the combination, and irinotecan is added to it in the studied regimen.