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Reumatol Clin ; 9(6): 359-64, 2013.
Article in English | MEDLINE | ID: mdl-24099959

ABSTRACT

OBJECTIVE: To determine the incidence and prevalence of cancer in a cohort of patients with systemic lupus erythematosus (SLE) and identify associated risk factors. PATIENTS AND METHODS: The study comprised a dynamic cohort of SLE patients (November 1989 to December 2006) at a tertiary referral centre. An adjusted external control from the hospital tumour registry was used. RESULTS: The study included 175 SLE patients (90% women), with a mean time at risk of 1370.5 patient-years. Fourteen women (8%) died, mainly from cardiovascular events. No patient died due to malignancy. We found 35 tumours in 28 patients, 25 of them after the diagnosis of SLE, of which 5 were malignant. The rate of benign tumours was 14.6/1000 patient-years (95% CI, 8.9-22.5) and of malignant tumours 3.6/1000 patient-years (95% CI, 1.5-8.8), with a crude incidence odds ratio for malignant tumours of 3.5 (95% CI, 1.5-7.9). However, this significance was lost after standardizing the rates. Concerning associated risk factors, differences were found in the mean erythrocyte sedimentation rate [HR 1.4 (1.1-1.7)], and the presence of thrombosis [HR 6.9 (1.49-41.2)], especially arterial thrombosis. CONCLUSIONS: We found a crude incidence rate of cancer that was almost four times greater in our SLE patients as compared with the expected rate in the hospital area of western Malaga.


Subject(s)
Lupus Erythematosus, Systemic/complications , Neoplasms/epidemiology , Neoplasms/etiology , Adult , Female , Humans , Incidence , Male , Middle Aged , Prevalence , Prospective Studies , Risk Factors , Spain/epidemiology
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