E.1 Medical condition or disease under investigation |
E.1.1 | Medical condition(s) being investigated |
Subclinical hypothyroidism |
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E.1.1.1 | Medical condition in easily understood language |
Thyroid hormone has multiple actions in the body. In subclinical hypothroidism the thyroid gland is mildly underactive. This does not cause major symptoms but may contribute to poor health in old age. |
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E.1.1.2 | Therapeutic area | Diseases [C] - Hormonal diseases [C19] |
MedDRA Classification |
E.1.2 Medical condition or disease under investigation |
E.1.2 | Version | 15.0 |
E.1.2 | Level | LLT |
E.1.2 | Classification code | 10064627 |
E.1.2 | Term | Subclinical hypothyroidism |
E.1.2 | System Organ Class | 10014698 - Endocrine disorders |
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E.1.3 | Condition being studied is a rare disease | No |
E.2 Objective of the trial |
E.2.1 | Main objective of the trial |
i. Does thyroxine treatment for SCH give multi-modal benefits for older people with SCH? ii. Are benefits seen across a wide range of outcomes, including prevention of cardiovascular disease, and improving health-related quality of life, muscle function and cognition? iii. Are benefits seen in specific subgroups of older people with SCH, including women, very elderly and those with mild degrees of SCH (TSH 4.6-10 mU/L)? iv. Are any benefits offset by adverse effects, such as atrial fibrillation or heart failure? |
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E.2.2 | Secondary objectives of the trial |
i. To establish a strong European network of complementary research expertise on SCH in older people, including geriatric medicine, endocrinology and metabolic medicine, primary care, cardiovascular disease and biostatistics. ii. To link this research expertise with strong focus on patient perspective and needs. iii. To provide the necessary evidence to properly inform best practice for treatment of SCH in older people. iv. To disseminate this evidence to health-care practitioners and patients. v. To improve clinical practice in management of SCH in older people. vi. To improve health and wellbeing of older people with SCH. vii. To establish a blood biobank, to be used in future research into causes and mechanisms of health, disease and disability in later life. viii. To determine the association of thyroid function with long-term risk of future illness and mortality in older people, using record linkage for the screenees. |
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E.2.3 | Trial contains a sub-study | No |
E.3 | Principal inclusion criteria |
Community-dwelling patients aged >65 years with SCH. SCH is defined as persistently elevated TSH levels (>=4.6 and <=19.9 mU/L) and free thyroxine (fT4) in reference range measured on a minimum of two occasions at least 3 months apart. |
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E.4 | Principal exclusion criteria |
• Subjects currently on Levothyroxine, antithyroid medication (eg. Carbimazole, methimazole, propylthiouracil, potassium percholate), amiodarone or lithium. • Recent thyroid surgery or radio-iodine (within 12 months). • Grade IV NYHA heart failure. • Prior clinical diagnosis of dementia. • Recent hospitalisation for major illness or elective surgery (within 4 weeks). • Recent acute coronary syndrome, including myocardial infarction or unstable angina (within 4 weeks). • Terminal illness. • Subjects who are participating in ongoing RCTs of therapeutic interventions (including CTIMPs) • Plan to move out of the region in which the trial is being conducted within the next 2 years (proposed minimum follow-up period). Atrial fibrillation (sustained or paroxysmal) will not be an exclusion, as in itself this cardiac arrhythmia is not a contra-indication to thyroxine treatment. In addition atrial fibrillation is a common finding in the studied age groups and exclusion of subjects with it would potentially compromise the generalisability of our results. |
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E.5 End points |
E.5.1 | Primary end point(s) |
(1) Fatal and non-fatal cardiovascular events (this will include acute myocardial infarction; stroke; amputations for peripheral vascular disease; revascularisations for atherosclerotic vascular disease, including for acute coronary syndrome and heart failure hospitalisations). (2) Change in disease specific QOL (measured using symptom and fatigue domains from the Thyroid-specific Quality of Life patient-reported outcome measure (ThyPRO) – measured at baseline; 3 month; 12 month and close-out. |
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E.5.1.1 | Timepoint(s) of evaluation of this end point |
The aim is to record 565 cardiovascular events over 9000 years of patient follow-up. It is anticipated that a minimum of 2 years follow up will be required with a likely average of 3 years for each patient. |
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E.5.2 | Secondary end point(s) |
(1) General QOL (measured using EuroQOL) at baseline; 3 month; 12 month and final follow up. (2) Handgrip strength (measured using the Jadaar hand dynamometer) at baseline; 12 months and final follow up. (3) Cognitive function, particularly executive function (measured using Letter Digit Coding Test [LDCT) at baseline and final follow-up. (4) Total mortality and cardiovascular mortality (5) Functional ability (basic Activities of Daily Living (ADL) measured using Barthel Index [BI]; extended activities of daily living measured using the older American resources and services [OARS]) at baseline and final follow-up. (6) Haemoglobin, measured on a full blood count at baseline and 1 year. |
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E.5.2.1 | Timepoint(s) of evaluation of this end point |
Timepoints listed above with each secondary endpoint. |
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E.6 and E.7 Scope of the trial |
E.6 | Scope of the trial |
E.6.1 | Diagnosis | No |
E.6.2 | Prophylaxis | Yes |
E.6.3 | Therapy | Yes |
E.6.4 | Safety | Yes |
E.6.5 | Efficacy | Yes |
E.6.6 | Pharmacokinetic | No |
E.6.7 | Pharmacodynamic | No |
E.6.8 | Bioequivalence | No |
E.6.9 | Dose response | No |
E.6.10 | Pharmacogenetic | No |
E.6.11 | Pharmacogenomic | No |
E.6.12 | Pharmacoeconomic | No |
E.6.13 | Others | No |
E.7 | Trial type and phase |
E.7.1 | Human pharmacology (Phase I) | No |
E.7.1.1 | First administration to humans | No |
E.7.1.2 | Bioequivalence study | No |
E.7.1.3 | Other | No |
E.7.1.3.1 | Other trial type description | |
E.7.2 | Therapeutic exploratory (Phase II) | No |
E.7.3 | Therapeutic confirmatory (Phase III) | No |
E.7.4 | Therapeutic use (Phase IV) | Yes |
E.8 Design of the trial |
E.8.1 | Controlled | Yes |
E.8.1.1 | Randomised | Yes |
E.8.1.2 | Open | No |
E.8.1.3 | Single blind | No |
E.8.1.4 | Double blind | Yes |
E.8.1.5 | Parallel group | Yes |
E.8.1.6 | Cross over | No |
E.8.1.7 | Other | No |
E.8.2 | Comparator of controlled trial |
E.8.2.1 | Other medicinal product(s) | No |
E.8.2.2 | Placebo | Yes |
E.8.2.3 | Other | No |
E.8.2.4 | Number of treatment arms in the trial | 2 |
E.8.3 |
The trial involves single site in the Member State concerned
| No |
E.8.4 | The trial involves multiple sites in the Member State concerned | No |
E.8.4.1 | Number of sites anticipated in Member State concerned | 1 |
E.8.5 | The trial involves multiple Member States | Yes |
E.8.5.1 | Number of sites anticipated in the EEA | 3 |
E.8.6 Trial involving sites outside the EEA |
E.8.6.1 | Trial being conducted both within and outside the EEA | Yes |
E.8.6.2 | Trial being conducted completely outside of the EEA | No |
E.8.6.3 | If E.8.6.1 or E.8.6.2 are Yes, specify the regions in which trial sites are planned |
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E.8.7 | Trial has a data monitoring committee | Yes |
E.8.8 |
Definition of the end of the trial and justification where it is not the last
visit of the last subject undergoing the trial
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Last visit of last subject |
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E.8.9 Initial estimate of the duration of the trial |
E.8.9.1 | In the Member State concerned years | 4 |
E.8.9.1 | In the Member State concerned months | 4 |
E.8.9.1 | In the Member State concerned days | 0 |
E.8.9.2 | In all countries concerned by the trial years | 3 |
E.8.9.2 | In all countries concerned by the trial months | 1 |
E.8.9.2 | In all countries concerned by the trial days | 0 |