Introduction

The randomized controlled OPTIC trial reported that optimised mercaptopurine treatment was superior to placebo in achieving clinical, endoscopic and histological outcomes at one year in ulcerative colitis (UC) patients failing 5-aminosalicylates after receiving induction treatment with corticosteroids.

Aims & Methods

We aimed to assess cost-effectiveness and cost-utility of therapeutic drug monitoring (TDM)-guided mercaptopurine treatment in UC. Data were collected during the OPTIC trial to perform a health economic evaluation for mercaptopurine treatment versus placebo in UC patients. The economic evaluation was performed from a health care and societal perspective using a cost-effectiveness and cost-utility analysis with a time horizon of one year. Volumes and costs of in-hospital care, out-of-hospital care, out-of-pocket expenses and productivity loss were assessed. Main outcomes were the costs per patient who achieved combined corticosteroid-free clinical remission and endoscopic improvement at one year and the costs per quality-adjusted life-year (QALY).

Results

In total, 59 patients were randomized to the intervention (n = 29) and control (n = 30) group. Patients on mercaptopurine treatment showed a non-significant gain in QALYs of 0.047 (-0.024 to 0.117) (P=0.184) corrected for baseline health utility. Non-significant differences in costs were €63 (-€1267 to €1434; P=0.927) in favour of placebo from a health care perspective and -€742 (-€3683 to €2016; P=0.644) in favour of mercaptopurine from a societal perspective, including patients’ out-of-pocket expenses and employers’ productivity loss. The probability of optimised mercaptopurine treatment being cost-effective was 0.80 at a willingness to pay per additional QALY of €20,000.

Conclusion

Optimised mercaptopurine treatment in UC patients failing 5-aminosalicylates is a cost-effective strategy from a societal perspective.

References

1. de Boer NKH, Peyrin-Biroulet L, Jharap B, et al. Thiopurines in inflammatory bowel disease: new findings and perspectives. J Crohns Colitis 2018;12:610–20.
2. Löwenberg, M., Volkers, A., van Gennep, S., Mookhoek, A., Montazeri, N., Clasquin, E., Duijvestein, M., van Bodegraven, A., Rietdijk, S., Jansen, J., van Asseldonk, D., van der Zanden, E., Dijkgraaf, M., West, R., de Boer, N., & D'Haens, G. (2023). Mercaptopurine for the Treatment of Ulcerative Colitis: A Randomized Placebo-Controlled Trial. Journal of Crohn's & Colitis, 17(7), 1055–1065.

Disclosure

NA