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Study
September 2005

Incidence of Cancer Among Patients With Atopic Dermatitis

Author Affiliations

Author Affiliations: Department of Medicine, Section of Dermatology and Venereology (Drs Hagströmer and Emtestam), and Department of Medical Epidemiology and Biostatistics (Drs Ye and Nyrén), Karolinska Institutet and Karolinska University Hospital Huddinge, Stockholm, Sweden.

Arch Dermatol. 2005;141(9):1123-1127. doi:10.1001/archderm.141.9.1123
Abstract

Objective  To assess the risk of skin cancer and other cancers among patients with atopic dermatitis.

Design  Register-based retrospective cohort study.

Setting  Sweden.

Patients  A total of 15 666 hospitalized patients identified in the national Inpatient Register as having discharge diagnoses of atopic dermatitis between January 1, 1965, and December 31, 1999.

Interventions  The National Swedish Cancer Register coded malignant neoplasms during the entire period of study. Follow-up time was calculated from the date of entry in the cohort until the occurrence of a first cancer diagnosis, emigration, death, or the end of the observation period, whichever occurred first.

Main Outcome Measures  Follow-up by means of record linkages to several nationwide registers, among them the National Swedish Cancer Register. Standardized incidence ratios (SIRs) (the ratios of numbers of observed patients with cancer to expected numbers of incident cases of cancer) estimated the risk of developing cancer relative to the risks in the age-, sex-, and calendar year– matched general Swedish population.

Results  After excluding the first year of follow-up, the risk of developing any cancer was increased by 13% (95% confidence interval [CI] of SIR, 1.01-1.25, based on 311 observed patients with cancer). Excess risks were observed for cancers of the esophagus (SIR, 3.5; 95% CI, 1.3-7.7; 6 patients), pancreas (SIR, 1.9; 95% CI, 1.0-3.4; 11 patients), brain (SIR, 1.6; 95% CI, 1.1-2.4; 27 patients), and lung (SIR, 2.0; 95% CI, 1.3-2.8; 31 patients) and for lymphoma (SIR, 2.0; 95% CI, 1.4-2.9; 29 patients). There was a nonsignificant 50% excess risk for nonmelanoma skin cancer (SIR, 1.5; 95% CI, 0.8-2.6; 12 patients), seemingly confined to men and to the first 10 years of follow-up. Malignant melanoma did not occur more often than expected.

Conclusions  The observed risk elevations, all of borderline statistical significance, should be interpreted cautiously. We could not control for possible confounding by cases of cancer caused by smoking, and the combination of multiple significance testing and few observed patients may have generated chance findings.

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