4.6 Article

Discontinuation, persistence and adherence to subcutaneous biologics delivered via a homecare route to Scottish adults with rheumatic diseases: a retrospective study

Journal

BMJ OPEN
Volume 9, Issue 9, Pages -

Publisher

BMJ PUBLISHING GROUP
DOI: 10.1136/bmjopen-2018-027059

Keywords

biologics; psoriatic arthritis; rheumatoid arthritis; ankylosing spondylitis; persistence; adherence

Funding

  1. The Farr Institute@Scotland
  2. Arthritis Research UK
  3. British Heart Foundation
  4. Cancer Research UK
  5. Economic and Social Research Council
  6. Engineering and Physical Sciences Research Council
  7. Medical Research Council
  8. National Institute of Health Research
  9. National Institute for Social Care and Health Research (Welsh Assembly Government)
  10. Chief Scientist Office (Scottish Government Health Directorates)
  11. Wellcome Trust (MRC Grant) [MR/K007017/1]
  12. MRC [MR/K007017/1] Funding Source: UKRI

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Objectives To understand patterns of subcutaneous (SC) biologics use over time in adults with inflammatory rheumatic musculoskeletal diseases receiving a homecare delivery service. Design Retrospective cohort. Setting Patients in secondary care receiving SC biologics in the largest Scottish Health Board. Participants A new bespoke cohort was created from routine data gathered as part of a health board Homecare Service Database. Patients over 18 years who received a supply of SC biologic from January 2012 to May 2015 with a diagnosis for rheumatoid arthritis (RA), psoriatic arthritis (PsA) or ankylosing spondylitis (AS) were included. Outcomes measured A standardised framework was applied by measuring discontinuation rates, persistence using Kaplan-Meier analysis and Cox regression and adherence using medication refill adherence (MRA) and compliance rate (CR). Results 751 patients were identified (AS: 105, PsA: 227, RA: 419) of whom 89.3% had more than one biologic delivery (median days' follow-up: AS: 494; PsA: 544; RA: 529) and 83.2% did not switch biologic. For all conditions, approximately half were persistent on their index biologic (52% AS, 54% PsA, 48%RA). Of patients who discontinued treatment, the majority reinitiated with the same biologic (19% AS, 18% PsA and 21% RA). Overall adherence during the period of treatment was over 80% when calculated using MRA (median %MRA: AS: 84.0%, PsA: 85.0%, RA: 82.4%) or CR (median %CR: AS: 96.6%, PsA: 97%, RA: 96.6%). Conclusion Use of linked routine data is a sustainable pathway to enable ongoing evaluation of biologics use. A more consistent approach to studying use (discontinuation, persistence and adherence metrics) should be adopted to enable comparability of studies.

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