Clinical trial · Interventional
Evaluating Dose Timing (Morning vs Evening) of Endocrine-based Therapies in Metastatic Breast and Prostate Cancers
A Randomised, Multicentre Trial Evaluating the Dose Timing (Morning vs Evening) of Endocrine-based Therapies in Metastatic Breast and Prostate Cancers (REaCT-CHRONO-MetBP Pilot Study)
- Source
- ClinicalTrials.gov
- Retrieved
- Sep 8, 2026
- Layer
- normalized (units and labels harmonized; values unchanged)
- Run
- ING-CLINICALTRIALS-20260908-000001
Summary
Brief summary (as posted)
The REaCT-CHRONO-MetBP Pilot study will compare morning and evening administration of endocrine-based therapy in metastatic breast and prostate cancers. Participants with metastatic breast or prostate cancer will be randomly placed in one of two groups: a morning group and an evening group. The group assignment will determine whether they take their endocrine therapy in the morning or the evening. The primary outcome of this pilot study is to evaluate the feasibility of study procedures in order to conduct a larger definitive trial in the future. The secondary outcomes include comparing quality of life, tolerability, and efficacy outcomes between the morning and evening groups for each of the two cancer cohorts (metastatic breast and prostate cancer).
Conditions
Conditions (2)
Free-text conditions as registered, with the CancerIndex entity they were reconciled to and the match type.
| Condition (as posted) | Mapped entity | Match | Confidence |
|---|---|---|---|
| Metastatic Breast Cancer | Malignant Breast Neoplasm | CURATED_BROADER | 0.78 |
| Metastatic Prostate Cancer | Malignant Prostate Neoplasm | CURATED_BROADER | 0.78 |
Interventions
Interventions (4)
| Intervention | Type | Mapped drug | Match |
|---|---|---|---|
| Evening administration of ARPI | Other | — | UNRESOLVED |
| Evening administration of CDK4/6 inhibitor | Other | — | UNRESOLVED |
| Morning administration of ARPI | Other | — | UNRESOLVED |
| Morning administration of CDK4/6 inhibitor | Other | — | UNRESOLVED |
Design
Arms and outcomes
Arms (4)
- type
- ACTIVE_COMPARATOR
- label
- Cohort A, Arm A: Breast Cancer Cohort, Morning Group
- description
- Participants with metastatic breast cancer in this arm are assigned morning administration of CDK4/6 inhibitor.
- interventionNames
- Other: Morning administration of CDK4/6 inhibitor
- type
- ACTIVE_COMPARATOR
- label
- Cohort A, Arm B: Breast Cancer Cohort, Evening Group
- description
- Participants with metastatic breast cancer in this arm are assigned evening administration of CDK4/6 inhibitor.
- interventionNames
- Other: Evening administration of CDK4/6 inhibitor
- type
- ACTIVE_COMPARATOR
- label
- Cohort B, Arm A: Prostate Cancer Cohort, Morning Group
Eligibility
Eligibility (as posted)
- Sex
- All
- Minimum age
- 18 Years
Show eligibility criteria text
Cohort A (Breast Cohort) Inclusion Criteria * Patients with metastatic hormonal receptor positive breast cancer * Plan to receive endocrine therapy and a CDK4/6 inhibitor (either Ribociclib or Palbociclib) in the first-line metastatic setting * Age ≥18 years * Able to provide oral consent * Willing and able to complete questionnaires as per study protocol Cohort A (Breast Cohort) Exclusion Criteria * Any contraindication in taking endocrine therapy and CDK4/6 inhibitor in the morning or evening * Plan to receive abemaciclib (as this requires twice a day dosing) Cohort B (Prostate Cancer) Inclusion Criteria * Patients with metastatic castrate sensitive prostate cancer * Plan to receive androgen receptor pathway inhibitor (either enzalutamide, apalutamide or abiraterone acetate) in combination with androgen deprivation therapy * Age ≥18 years * Able to provide oral consent * Willing and able to complete questionnaires as per study protocol Cohort B (Prostate Cancer) Exclusion Criteria * Any contraindication in taking androgen receptor pathway inhibitor in the morning or evening * Plan to receive darolutamide (as this requires twice a day dosing) * Plan to receive docetaxel in combination with androgen receptor pathway inhibitor
References
Publications (2)
- BACKGROUNDBeltran-Bless AA, Vandermeer L, Ibrahim MFK, Hutton B, Shorr R, Savard MF, Clemons M. Does the Time of Day at Which Endocrine Therapy Is Taken Affect Breast Cancer Patient Outcomes? Curr Oncol. 2021 Jul 6;28(4):2523-2528. doi: 10.3390/curroncol28040229. PMID 34287262
- BACKGROUNDSavard MF, Ibrahim M, Saunders D, Pond GR, Ng TL, Awan AA, Sehdev S, Alqahtani N, Vandermeer L, MacDonald F, Beltran-Bless AA, Fallowfield L, Clemons M. A pragmatic, multicenter, randomized trial comparing morning versus evening dosing of adjuvant endocrine therapy (REaCT-CHRONO Study). NPJ Breast Cancer. 2025 May 29;11(1):49. doi: 10.1038/s41523-025-00762-7. PMID 40442096