BRE-08 Phase II Study of CMC Regimen for Early Stage Breast Cancer (BRE-08)

BRE-08: A Phase II Study of an All-Oral Adjuvant Chemotherapy Regimen of Cyclophosphamide, Methotrexate, and Capecitabine (CMC) for Early-Stage Breast Cancer

This is a non-randomized, single arm phase 2 trial of oral CMC based on conversion of doses that would be delivered with conventional metronomic CMF chemotherapy.

Study Overview

• Status: Recruiting
• Conditions: Breast Cancer
• Intervention / Treatment: Drug: Cyclophosphamide; Drug: Methotrexate; Drug: Capecitabine

Detailed Description

Participants who require adjuvant radiotherapy for locoregional management may opt to initiate radiotherapy following the fourth cycle of CMC with the final 4 cycles held during radiotherapy. Following completion of radiation therapy, participants may then resume with cycle 5 of CMC. The washout period before and after radiation therapy is a minimum of 2 weeks. Alternatively, patients may receive adjuvant radiotherapy after the completion of the final (8) cycle of CMC.

The study team will collect data on cyclophosphamide, methotrexate, and capecitabine compliance at routine clinical visits every 3 weeks. In addition, standard electrolyte, chemistry and liver function laboratory monitoring will be conducted at each clinic visit

• Study Type: Interventional
• Enrollment (Estimated): 25
• Phase: Phase 2

Contacts and Locations

• Study Contact: Name: Prathmika Jha, BS; Phone Number: 312-413-2746; Email: pjha7@uic.edu
• Study Contact Backup: Name: Abiola Ibreeheem, MD; Phone Number: 312-413-1581; Email: abiolai@uic.edu

Study Locations

• United States
  • Illinois
    • Chicago, Illinois, United States, 60612
      • Recruiting
      • University of Illinois
      • Contact: Prathmika Jha, BS; Phone Number: 312-413-2746; Email: pjha7@uic.edu
      • Contact: Abiola R Ibreeheem, MD; Phone Number: 312-413-1581; Email: abiolai@uic.edu

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

I• Age ≥ 18 years of age at time of consent

• ECOG performance status 0, 1, or 2
• Histologically confirmed invasive breast cancer documented by biopsy or surgical excision.
• Underwent potentially curative resection of primary breast tumor(s) with no gross residual local-regional disease (patients with microscopically positive margins are eligible if adjuvant radiotherapy is planned), with most recent breast or axillary surgery < 90 days prior to date of signed consent.
• No evidence of distant metastatic disease
• No prior systemic therapy for this cancer other than pre-operative endocrine therapy
• Treating Oncologist recommends adjuvant chemotherapy without concurrent biologic/targeted therapy. Patients may receive a CDK4/6 inhibitor after completion of all study treatment, concurrently with adjuvant endocrine therapy. Patients with a germline pathogenic/likely pathogenic variant in a DNA homologous repair gene (e.g. BRCA1, BRCA2, PALB2) may receive adjuvant PARP inhibitor therapy after completion of all study treatment.
• Tumor is estrogen receptor (ER)-positive (> 10% by IHC) and/or progesterone receptor (PR)-positive (> 10% by IHC), HER2-negative by IHC or FISH according to 2018 ASCO-CAP guidelines.

• AJCC pathologic stage:

  o pT1-3/pN0-2 based on sentinel lymph node biopsy or axillary dissection

• High risk gene expression profile (either luminal B on MammaPrint/BluePrint, or Recurrence Score > 25 on Oncotype Dx). Study participants are not required to have a high-risk gene expression profile if they have a clinical high-risk tumor, defined as:

Age < 50 and any of the following:

• Involvement of 1-3 axillary lymph nodes with metastatic carcinoma (pN1mic/N1)
• grade 1 tumor > 3 cm; or grade 2 tumor > 2 cm; or grade 3 tumors > 1 cm (size based on pathological assessment of the maximal dimension of the invasive component of the tumor)
• pT1c-T2 and Ki-67 > 20%
• Presence of lymphovascular invasion stage IIIA (pT3/pN1 or pT1-3/pN2)

Age > 50 and any of the following:

• Primary tumor > 5 cm (pT3)

• stage IIIA (pT3/pN1 or pT1-3/pN2)

  • Adequate organ function as defined in Table 1. All screening labs to be obtained within 30 days prior to registration.
  • Patients with synchronous bilateral primary breast tumors or multiple ipsilateral primary breast tumors are eligible if the treating Oncologist determines that the CMC regimen is appropriate therapy for all primary tumors requiring chemotherapy.
  • Able to provide written informed consent and HIPAA authorization for release of personal health information.
  • Women of childbearing potential must agree to use 2 methods of birth control, at least one being a barrier form of contraception if they are sexually active with a male partner unless they are considered highly unlikely to conceive as defined in section 8.6, and cannot be pregnant or breast-feeding. A negative serum or urine pregnancy test is required per institutional practice guidelines.
  • As determined at the discretion of the enrolling physician or protocol designee, ability of the subject to understand and comply with study procedures for the entire length of the study.

  • Patients with history of HIV/AIDS (acquired immunodeficiency syndrome) are eligible for this study if they are receiving anti-retroviral therapy and it does not include any medications known to alter metabolism or tolerability of component drugs in the CMC regimen (see Appendix), and either of the following criteria are met:

    • Patients without a history of AIDS-defining opportunistic infections.
    • Patients with a history of AIDS-defining opportunistic infections, but they have not had an opportunistic infection within the past 12 months.
  • Patients with Hepatitis B (HBV): chronic carriers of HBV infection (HBsAg-positive) or individuals who have serologic evidence of a resolved prior HBV infection (i.e., HBsAg-negative and anti-HBc-positive) are eligible if they are receiving appropriate suppressive antiviral therapy that does not include medications known to alter metabolism or tolerability of component drugs in CMC (see Appendix) prior to initiation of cancer therapy, and liver function tests meet study eligibility criteria.
  • Patients with Hepatitis C (HCV): patients with a history of HCV infection who have completed curative antiviral treatment are eligible if the HCV RNA viral load is below the limit of quantification within 90 days of study enrollment. Patients on concurrent HCV treatment must have HCV RNA viral load below the limit of quantification within 30 days of study enrollment. Patients must also meet liver function test eligibility requirements and antiviral therapy does not include medications known to alter metabolism or tolerability of component drugs in CMC.

Exclusion Criteria

Subjects meeting any of the criteria below are ineligible for this study:

• Prior cytotoxic chemotherapy for this breast cancer
• Any investigational agents administered during or within 2 weeks prior to start of CMC chemotherapy
• AJCC stage IIIB-IIIC or stage IV
• Active infection requiring systemic therapy
• Untreated HIV/AIDS
• Documented DYPD deficiency
• Pregnant or nursing
• Require anticoagulation with warfarin. Anticoagulation with low molecular weight heparins, heparin, or direct oral anticoagulants (DOACs) is permitted.
• Any prior or concurrent malignancy whose natural history or treatment has the potential to interfere with the safety or efficacy assessment of this investigational regimen, as determined by the treating medical oncologist.
• Any mental or medical condition that prevents the patient from giving informed consent or participating in the trial.
• Other major comorbidity (e.g. advanced cardiopulmonary disease, uncontrolled diabetes mellitus) that may affect the safety or efficacy assessment of this investigational regimen, as determined by study PI
• Inability to swallow pills
• Any medical condition interfering with absorption of oral medications
• Any contraindication for any chemotherapy drug used in the CMC regimen
• Active and ongoing use of medicines known to alter metabolism or tolerability of component drugs in CMC.
• Prisoners
• Unable or unwilling to take a large number of oral pills

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Other: CMC orally; All agents in CMC are oral and conform to a 3-week = 1 cycle regimen. All subjects will receive Cyclophosphamide 60mg/m2 PO once a day (21 continuous days) Methotrexate 10mg/m2 PO BID on days 1, 8, and 15 Capecitabine 825mg/m2 PO BID on days 1-14	Drug: Cyclophosphamide; 60mg/m2 PO once a day (21 continuous days); Drug: Methotrexate; 10mg/m2 PO BID on days 1, 8, and 15; Drug: Capecitabine; 825mg/m2 PO BID on days 1-14

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Relative Dose Intensity (RDI) in patients treated with the CMC regimen. RDI is defined as the sum total of delivered drug in mg/m2/week for each drug in the CMC regimen per the number of participants that have equal to or greater than 85%	Number of participants that have RDI of the CMC regimen is equal to or greater than 85%	1 year

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Invasive Disease Free Survival (iDFS)	Number of participants that have iDFS, defined as the time from enrollment to documentation of the first of the following: invasive cancer in the ipsilateral breast/chest wall or regional nodes, contralateral invasive breast or regional nodes, distant metastases, or death from any cause	10 years
Distant Disease Free Survival (DDFS)	Number of participants that have DDFS defined as the time from enrollment to documentation of distant metastases or death from any cause.	10 years
Overall Survival (OS)	Number of participants that have OS defined as the time from study enrollment to the date of the subject's death	10 years
Participant outcomes using the Quality of Life (QOL) and EORTC QOL-C30 questionnaires	Number of participants having good outcome versus low outcomes. High score means worse health outcomes and low score means better health outcomes	10 years
Protocol therapy interruption	Number of participants that have protocol therapy interruption	10 years
Discontinuation of protocol therapy	Number of participants that have discontinuation of protocol therapy	10 years
Rates of dose reduction of cyclophosphamide	Number of participants that have dose reduction of cyclophosphamide	10 years
Rates of dose reduction of methotrexate	Number of participants that have dose reduction of methotrexate	10 years
Rates of dose reduction of capecitabine	Number of participants that have dose reduction of capecitabine	10 years
Safety of oral CMC regime per the number of participants experiencing adverse events	Number of participants having adverse event using the NCI Common Terminology Criteria for Adverse Events (CTCAE), version 5	1 year

Collaborators and Investigators

• Sponsor: University of Illinois at Chicago

Study record dates

Study Major Dates

• Study Start (Actual): November 22, 2023
• Primary Completion (Estimated): September 1, 2034
• Study Completion (Estimated): September 1, 2034

Study Registration Dates

• First Submitted: October 9, 2023
• First Submitted That Met QC Criteria: October 9, 2023
• First Posted (Actual): October 17, 2023

Study Record Updates

• Last Update Posted (Actual): December 19, 2025
• Last Update Submitted That Met QC Criteria: December 17, 2025
• Last Verified: December 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Neoplasms by Site; Neoplasms; Skin Diseases; Breast Diseases; Skin and Connective Tissue Diseases; Breast Neoplasms; Organic Chemicals; Heterocyclic Compounds, 1-Ring; Heterocyclic Compounds; Heterocyclic Compounds, 2-Ring; Heterocyclic Compounds, Fused-Ring; Nucleic Acids, Nucleotides, and Nucleosides; Hydrocarbons; Deoxycytidine; Cytidine; Pyrimidine Nucleosides; Pyrimidines; Phosphoramide Mustards; Nitrogen Mustard Compounds; Mustard Compounds; Hydrocarbons, Halogenated; Phosphoramides; Organophosphorus Compounds; Nucleosides; Pterins; Pteridines; Uracil; Pyrimidinones; Aminopterin; Deoxyribonucleosides; Fluorouracil; Capecitabine; Methotrexate; Cyclophosphamide
• Other Study ID Numbers: 2023-0429

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No