Research Article
Risk of Malignant Neoplasm in Patients with Incident Rheumatoid Arthritis 1980–2007 in relation to a Comparator Cohort: A Population-Based Study
Table 1
Cumulative incidence rates of malignancy in 813 patients with rheumatoid arthritis in 1980–2007 compared to 813 subjects without rheumatoid arthritis.
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NMSC = nonmelanoma skin cancer; RA = rheumatoid arthritis; SE = standard error; CI = confidence interval. No malignancies were observed in these sites/types: multiple myeloma, myeloproliferative syndrome, and myelodysplastic syndrome. Comparisons were not performed for the following sites/types with fewer than 5 malignancies per cohort (number of events after incidence in RA/index in non-RA): gastric (1/3), pancreatic (4/2), other digestive (2/5), other thorax (1/0), bone (1/0), soft tissue (1/4), ductal carcinoma in situ (6/4), ovary (2/1), other gynecological (4/4), kidney (2/5), other genitourinary (2/2), ophthalmologic (1/0), central nervous system (2/3), and other (2/2). Adjusted for age, sex, and calendar year of RA incidence/index date. Cumulative incidence is adjusted for the competing risk of death. |