Evaluating the Dose Timing (Morning vs Evening) of Endocrine Therapy and Its Effects on Tolerability and Compliance
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ClinicalTrials.gov Identifier: NCT04864405 |
Recruitment Status :
Active, not recruiting
First Posted : April 28, 2021
Last Update Posted : April 21, 2022
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Condition or disease | Intervention/treatment | Phase |
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Breast Cancer | Other: Morning administration of endocrine therapy Other: Evening administration of endocrine therapy | Phase 4 |
Study Type : | Interventional (Clinical Trial) |
Actual Enrollment : | 247 participants |
Allocation: | Randomized |
Intervention Model: | Parallel Assignment |
Masking: | None (Open Label) |
Primary Purpose: | Treatment |
Official Title: | A Pragmatic Randomised, Multicentre Trial Evaluating the Dose Timing (Morning vs Evening) of Endocrine Therapy and Its Effects on Tolerability and Compliance (REaCT-CHRONO) |
Actual Study Start Date : | June 30, 2021 |
Estimated Primary Completion Date : | August 2022 |
Estimated Study Completion Date : | August 2023 |

Arm | Intervention/treatment |
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Active Comparator: Morning administration of endocrine therapy
Administration of endocrine therapy defined as, within one hour of the patient wake up time
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Other: Morning administration of endocrine therapy
Endocrine therapy administered within one hour of patient wake up time |
Active Comparator: Evening administration of endocrine therapy
Administration of endocrine therapy defined as, within one hour of the patient bed time
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Other: Evening administration of endocrine therapy
Endocrine therapy administered within one hour of the patient bed time |
- Endocrine toxicity and tolerability at 12 weeks [ Time Frame: 12 weeks after treatment initiation ]Measured by the change in total Functional Assessment of Cancer Therapy - Endocrine Symptoms (FACT-ES) questionnaire from baseline to 12 weeks following the beginning of endocrine therapy. FACT-ES is a validated sub scale of the Functional Assessment of Chronic Illness Therapy (FACIT) measurement system. FACT-ES consists of 46 items on a 5 point Likert type scale ranging from 0 (not at all) to 4 (very much). It is designed to measure five domains of health related quality of life in breast cancer patients receiving endocrine therapy: physical, social, emotional, functional well-being as well as an endocrine symptom sub-scale (ESS).
- Endocrine toxicity and tolerability [ Time Frame: Baseline, 4, 8, 12 and 52 weeks after treatment initiation ]Measured by the change in total score and individual Functional Assessment of Cancer Therapy - Endocrine Symptoms (FACT-ES) questionnaires from baseline to 4, 8, 12 and 52 weeks following the beginning of endocrine therapy. FACT-ES consists of 46 items on a 5 point Likert type scale ranging from 0 (not at all) to 4 (very much). It is designed to measure five domains of health related quality of life in breast cancer patients receiving endocrine therapy: physical, social, emotional, functional well-being as well as an endocrine symptom sub-scale (ESS).
- Health related quality of life scores [ Time Frame: Baseline, 4, 8, 12 and 52 weeks after treatment initiation ]Measured by the change in the total score and individual sub scales of the validated Functional Assessment of Cancer Therapy for patients with Breast cancer (FACT-B) questionnaire from baseline to 4, 8, 12 and 52 weeks following the beginning of endocrine therapy. The FACT-B consists of 37 items on a 5 point Likert type scale ranging from 0 (not at all) to 4 (very much). It is designed to measure five domains of health related quality of life in breast cancer patients: physical, social, emotional, functional well-being as well as a breast-cancer sub-scale (BCS).
- Endocrine therapy rates of non-compliance [ Time Frame: 52 weeks after treatment initiation ]Rates of non-persistence or non-compliance with initially prescribed endocrine therapy
- Cost-effectiveness [ Time Frame: 52 weeks after treatment initiation ]Incremental cost-effectiveness rations (cost per one quality-adjusted life year (QALY) gained).
- Rates of non-compliance to endocrine therapy [ Time Frame: 52 weeks after treatment initiation ]Comparing rates of non-compliance and non-persistence to endocrine therapy with patient age, turmour stage, chemotherapy use and type of endocrine therapy. The rates of non-compliance and rates of non-persistence will be tracked throughout the duration of the study and then compared to patient age, tumour stage, chemotherapy use and the type of endocrine therapy used.

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Ages Eligible for Study: | 18 Years and older (Adult, Older Adult) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | No |
Inclusion Criteria:
- Patients with an early stage or locally advanced hormonal receptor positive breast cancer
- Plan to receive endocrine therapy
- 18 years of age or older
- Able to provide oral consent
- Willing and able to complete questionnaires as per study protocol
Exclusion Criteria:
- Metastatic cancer
- Previous endocrine therapy for breast cancer

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04864405
Canada, Ontario | |
The Ottawa Hospital Cancer Centre | |
Ottawa, Ontario, Canada | |
Thunder Bay Regional Health Sciences Centre | |
Thunder Bay, Ontario, Canada, P7B 6V4 |
Principal Investigator: | Marie-France Savard, MD | Ottawa Hospital Research Institute |
Responsible Party: | Ottawa Hospital Research Institute |
ClinicalTrials.gov Identifier: | NCT04864405 |
Other Study ID Numbers: |
REaCT-CHRONO |
First Posted: | April 28, 2021 Key Record Dates |
Last Update Posted: | April 21, 2022 |
Last Verified: | April 2022 |
Studies a U.S. FDA-regulated Drug Product: | No |
Studies a U.S. FDA-regulated Device Product: | No |
Breast Cancer Endocrine Therapy Chronotherapy Chronotherapeutics |
Breast Neoplasms Neoplasms by Site Neoplasms Breast Diseases Skin Diseases |