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  • JAK Inhibitors Linked...

JAK Inhibitors Linked to Higher Cancer Risk in RA Patients: Study

Written By : Dr. Shravani Dali |Medically Reviewed By : Dr. Kamal Kant Kohli Published On 2025-07-01T20:15:53+05:30  |  Updated On 2 July 2025 11:49 AM IST
JAK Inhibitors Linked to Higher Cancer Risk in RA Patients: Study
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Data from a large German registry has revealed that Janus kinase (JAK) inhibitors used for rheumatoid arthritis are associated with significantly higher rates of malignancies compared to biologic agents. While some earlier studies showed mixed results, this study confirmed increased cancer risk overall, particularly in certain patient subgroups. The findings of the study have been published in the journal Annals of the Rheumatic diseases.

A study was done to estimate the effects of Janus kinase inhibitors (JAKis) vs biologic disease-modifying antirheumatic drugs (bDMARDs) on the risk of incident malignancies (excluding nonmelanoma skin cancer) in patients and patient subgroups with rheumatoid arthritis.

Episodes of disease-modifying antirheumatic drug (DMARD) treatment initiated between January 2017 and December 2020 and followed up to June 2024 in RABBIT, the German register for the long-term observation of therapy with biologics and targeted disease-modifying antirheumatic drugs in adult patients with rheumatoid arthritis, were analysed. Incidence rates (IRs) per 1000 patient-years with 95% CIs were calculated, and incident malignancy risk was estimated as hazard ratios (HRs) by inverse probability weighted adjusted Cox models.

Results: Among 2285 JAKi and 4259 bDMARD treatment episodes, 88 and 135 malignancies occurred, respectively. JAKi treatments were dominated by baricitinib and tofacitinib, while most bDMARD treatments comprised tumour necrosis factor inhibitors. IRs were 11.6 (95% CI: 9.3, 14.3) in JAKi- and 8.9 (95% CI: 7.4, 10.5) in bDMARD-treated groups. The adjusted HR comparing JAKis with bDMARDs was 1.40 (95% CI: 1.09, 1.80). An increase in the malignancy risk for JAKi vs bDMARD treatment could only be observed in treatment episodes lasting longer than 16 months.

The risk appeared higher in some subgroups of patients, including those who started treatment aged ≥60 years, patients with ≥3 prior conventional synthetic DMARD treatments, and patients with high disease activity. In this German observational cohort study, an overall small increase in malignancy risk for JAKi vs bDMARD treatment was observed, with more pronounced risks in some subgroups of patients. The observed risk should be carefully counterbalanced to the known malignancy risk associated with insufficient disease control.

Reference:

Comparative risk of incident malignancies in rheumatoid arthritis patients treated with Janus kinase inhibitors or bDMARDs: observational data from the German RABBIT register. Schaefer, Martin et al. Annals of the Rheumatic Diseases, Volume 0, Issue 0

JAK InhibitorsLinkedHigherCancerRiskRA PatientsStudy
Source : Annals of the Rheumatic Diseases
Dr. Shravani Dali
Dr. Shravani Dali

    Dr. Shravani Dali has completed her BDS from Pravara institute of medical sciences, loni. Following which she extensively worked in the healthcare sector for 2+ years. She has been actively involved in writing blogs in field of health and wellness. Currently she is pursuing her Masters of public health-health administration from Tata institute of social sciences. She can be contacted at editorial@medicaldialogues.in.

    Dr. Kamal Kant Kohli
    Dr. Kamal Kant Kohli

    Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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