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Skip Navigation LinksHome > January 2010 - Volume 89 - Issue 1 > Cancer-Associated Myositis and Anti-p155 Autoantibody in a S...
Medicine:
doi: 10.1097/MD.0b013e3181ca14ff
Article

Cancer-Associated Myositis and Anti-p155 Autoantibody in a Series of 85 Patients With Idiopathic Inflammatory Myopathy

Trallero-Araguás, Ernesto MD; Labrador-Horrillo, Moisés MD, PhD; Selva-O'Callaghan, Albert MD, PhD; Martínez, Maria Angeles PhD; Martínez-Gómez, Xavier MD; Palou, Eduard MD, PhD; Rodriguez-Sanchez, Jose Luis MD, PhD; Vilardell-Tarrés, Miquel MD, PhD

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Abstract

A new autoantibody against a 155-kDa protein has been described in patients with myositis. We conducted a study to determine the occurrence and types of cancer occurring in a cohort of patients with polymyositis (PM) or dermatomyositis (DM) and analyzed the value of this autoantibody as a serologic marker of cancer-associated myositis (CAM). Serum samples from all patients were examined by protein immunoprecipitation assays with HeLa cells to determine the presence of a 155-kDa protein band. HLA-DRB1 and DQA1 typing was performed by polymerase chain reaction-reverse sequence specific oligonucleotide. Statistical analyses were carried out with the Mann Whitney U and Fisher exact tests. Associations were determined using odds ratios (ORs) with 95% confidence intervals (CI).

Eighty-five patients with myositis (20 PM and 65 DM) were included. CAM was detected in 16 patients (19%), 14 with DM. The shawl sign rash was significantly more frequent in patients with CAM than in those without (p < 0.01). Adenocarcinoma was the most frequent type of cancer (87.5%). Anti-p155 autoantibody was found in 1 of the 20 (5%) patients with PM and in 15 of the 65 (23%) patients with DM. A relationship between anti-p155 and CAM was found in DM patients (OR, 23; 95% CI, 5.23-101.2). The HLA-DQA1*0102 allele was not found in any of the anti-p155-positive patients. The prevalence of CAM in our cohort was 19%. Autoantibody against p155 was highly related to CAM and could be a reliable marker of cancer in patients with DM.

Abbreviations CAM = cancer-associated myositis, CI = confidence interval, DM = dermatomyositis, OR = odds ratio, PM = polymyositis.

© 2010 Lippincott Williams & Wilkins, Inc.

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