Rheumatoid arthritis

Cancer risk in patients with rheumatoid arthritis treated with janus kinase inhibitors: a nationwide Danish register-based cohort study

Rheumatology (Oxford)Published Nationwide register-based cohort study

Main finding · Any cancer (except non-melanoma skin cancer)Result — go to the resultHazard ratio 1.41 95% CI 0.76–2.37

Authors' conclusion

JAKi treatment in real-world patients with RA was not associated with a statistically significant increased risk of first primary cancer compared with those who received bDMARDs.

Study context

Population
Patients with RA aged 18+ years without previous cancer who initiated janus kinase inhibitors (JAKi) or bDMARDs, 1 January 2017 to 31 December 2020, Denmark
Participants
875 vs 4,247
Exposure
JAKi vs bDMARDs
  • JAKin = 875
  • bDMARDn = 4,247reference
Outcome
First primary cancer (any cancer except non-melanoma skin cancer)
Methodological detailsobservational, inverse probability of treatment weighting (IPTW), cause-specific Cox models
  • Observational
  • Inverse probability of treatment weighting (IPTW)
  • Cause-specific Cox models

Main finding

Any cancer (except non-melanoma skin cancer)

Hazard ratio

1.41

95% CI 0.76–2.37

Events by group

JAKivs bDMARD
HR 1.41 (95% CI 0.76–2.37)

As reported in the abstract

Observational data: associations, not effects.

Original publication

Cancer risk in patients with rheumatoid arthritis treated with janus kinase inhibitors: a nationwide Danish register-based cohort study. Rheumatology (Oxford). Published 13 April 2023. doi:10.1093/rheumatology/kead163

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