Dose Optimization and Efficacy Assessment of a Fluoropyrimidine Antidote

NCT07032142 | Not Yet Recruiting Phase 1

• 2 other identifiers: ARCTURUS 81626124.3.1001.524981626124.3.1001.5249
• Study Type: interventional
• Target: 66
• Locations: 1 country
• Sites: 5

Brief Summary

Fluoropyrimidines (FLU) are drugs widely used in chemotherapy for various tumors, such as breast, colon, rectal, and gastric cancers. FLU is a drug that inhibits thymine synthesis and, consequently, DNA synthesis, leading to tumor cell death. However, up to 30% of patients treated with FLU experience severe toxicities, depending on the dose and regimen received. The most common symptoms include mucositis, vomiting, nausea, diarrhea, and neutropenia. The enzyme dihydropyrimidine dehydrogenase (DPD) plays a key role in FLU metabolism. Patients with mutations in the DPYD gene (which encodes DPD) are at high risk of experiencing severe toxicities from FLU. Uridine triacetate (UT) is a drug that can be used as an antidote for 5-FU in patients who develop severe toxicities. However, despite its efficacy, it is expensive and not commercially available in Brazil. Currently, the Brazilian population has no access to an antidote for the treatment of FLU-related toxicities. This Phase I/II study will evaluate the dose, safety, and efficacy of compound the association of two molecules as an antidote for grade 3 or higher toxicities resulting from the use of FLU.

Conditions

Cancer; Toxicity Due to Chemotherapy

Keywords

cancer; fluoropyrimidines; Toxicities from Fluoropyrimidines

Outcome Measures

Primary Outcomes (2)

• Maximum Tolerated Dose (MTD) Determination

  Definition of DMT (Phase I) : The maximum tolerated dose (DMT) is the highest dose that produces the desired effect without resulting in unacceptable side effects

  6 days

• Survival rate

  The rate will be calculated as the percentage of participants alive following the initiation of treatment

  7 days

Study Arms (1)

Patients who developed severe (grade 3 or higher) toxicities from the use of Fluoropyrimidines

EXPERIMENTAL

Drug: I-01/23

Interventions

I-01/23 DRUG

The I-01/23 will be administered over a 5-day period, with dosing adjusted according to the patient's body surface area (BSA).

Patients who developed severe (grade 3 or higher) toxicities from the use of Fluoropyrimidines

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Presence of at least one severe toxicity or intoxication resulting from fluoropyrimidine use, defined as: receiving an overdose of medication (total dose and/or infusion rate higher than recommended in the package insert) and/or Grade 3 or 4 serious adverse events after fluoropyrimidine exposure, according to CTCAE v5.0, which may include (but are not limited to): nausea, vomiting, diarrhea, anemia, neutropenia, febrile neutropenia, thrombocytopenia, and mucositis;
• Lack of access to uridine triacetate (UT) in the standard of care;
• Diagnosis of an invasive solid tumor under systemic treatment with a fluoropyrimidine (5-fluorouracil or capecitabine);
• Organ function considered adequate by the investigator prior to the current fluoropyrimidine intoxication episode;
• Ability to take oral medication;
• For men and women of reproductive potential, agreement to practice abstinence or use highly effective contraceptive methods during study participation and for at least 6 months after the last dose of IP;
• Men must agree not to donate sperm for at least 6 months after the last dose of IP;
• Body surface area between 1.4 and 2.4 m², calculated using the Du Bois method;
• AST/ALT within normal limits for participants without liver metastases;
• AST/ALT up to 3x the upper limit of normal in participants with liver metastases;
• Total and fractionated bilirubin up to 2x the upper limit of normal;
• Agreement to abstain from alcohol consumption during the treatment period;

You may not qualify if:

• Pregnant or breastfeeding women;
• Known history of allergic reaction to the molecules of the copound and/or to other molecules in the same class;
• Life expectancy of less than 30 days prior to hospital admission, based on underlying cancer and existing comorbidities;
• Estimated creatinine clearance \<70 mL/min;
• Liver cirrhosis;
• Known liver or kidney disease;
• Individuals with acquired immunodeficiency may be included only if they have no active opportunistic infections and following careful clinical assessment by the investigator, taking into account concurrent medications;
• Family history or known deficiency of the enzyme responsible for metabolizing the molecules of the copound and/or to other molecules in the same class;
• Uncontrolled infection;
• Hemodynamically unstable patients;
• Patients under orotracheal intubation;
• Patients unable to take oral medication;
• Prolonged QT interval;
• CNS metastases considered uncontrolled by the investigator;
• History of malabsorptive or inflammatory gastrointestinal disease;

Sponsors & Collaborators

• D'Or Institute for Research and Education: lead
• Conselho Nacional de Desenvolvimento Científico e Tecnológico: collaborator

Study Sites (5)

Instituto D'Or de Pesquisa e Ensino de Salvador

Salvador, Estado de Bahia, Brazil

Location

Instituto D'Or de Pesquisa e Ensino de Brasília

Brasília, Federal District, Brazil

Location

Instituto D'Or de Pesquisa e Ensino de Curitiba

Curitiba, Paraná, Brazil

Location

Instituto D'Or de Pesquisa e Ensino do Rio de Janeiro

Rio de Janeiro, Rio de Janeiro, Brazil

Location

Instituto D'Or de Pesquisa e Ensino de São Paulo

São Paulo, São Paulo, Brazil

Location

MeSH Terms

Conditions

Neoplasms

Central Study Contacts

Intituto D'Or de Pesquisa e Ensino São Paulo

CONTACT

pesquisaclinica@idor.org; oncologia.projetos@idor.org

Study Design

• Study Type: interventional
• Phase: phase 1
• Allocation: NA
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Doctor, Principal Investigator

Study Record Dates

• First Submitted: May 21, 2025
• First Posted: June 22, 2025
• Study Start: July 1, 2025
• Primary Completion (Estimated): July 1, 2028
• Study Completion (Estimated): July 1, 2028
• Last Updated: June 22, 2025

Record last verified: 2025-04

Data Sharing

• IPD Sharing: Will not share

Locations

BR (5)