Background & Aims
Physicians frequently encounter patients with immune-mediated diseases and a history of malignancy. There are limited data on the safety of immunosuppressive therapy for these patients. Published studies have been small with few events, precluding robust estimates of risk.
Methods
We searched Medline, EMBASE, and conference proceedings for terms related to immune mediated disease, immune-suppressive therapy, and cancer recurrence from inception to April 2015. We included 16 studies (9 of patients with rheumatoid arthritis, 8 of patients with inflammatory bowel disease, and of patients with psoriasis) and stratified studies by type of immune-suppressive therapy (monoclonal antibodies to tumor necrosis factor [anti-TNF], conventional immune-modulatory agents, or no immune suppression). A random effects meta-analysis was performed to calculate pooled incidence rates as well as risk differences between the various treatments.
Results
Our analysis included 11,702 persons contributing 31,258 person-years (p-y) of follow up after a prior diagnosis of cancer. Rates of cancer recurrence were similar among individuals receiving anti-TNF therapy (33.8/1000 p-y), immune-modulator therapy (36.2/1000 p-y), or no immunosuppression (37.5/1000 p-y), but were numerically higher among patients receiving combination immune suppression (54.5/1000 p-y) (P>.1 for all). Subgroup analysis of new and recurrent cancers separately, type of immune-modulator therapy, or immune-mediated disease revealed similar results, with no increase in risk. We found similar pooled incidence values for new or primary cancers when immunosuppression was initiated within 6 years (33.6/1000 p-y for immune-modulatory agents and 43.7/1000 p-y for anti-TNF agents) vs more 6 years after the index cancer (32.9/1000 p-y for immune-modulatory agents; P=.86 and 21.0/1000 p-y for anti-TNF agents; P=.43)
Conclusion
In a meta-analysis of 16 studies, we observed similar rates of cancer recurrence among individuals with prior cancer who received no immunosuppression, anti-TNF therapy, immune-modulator therapy, or combination treatments. Prospective studies are needed to ascertain optimal intervals for re-initiation of immune suppressive therapies for individuals with specific cancers.