ar2312 ARJ Correction <p>Correction: The <it>PTPN22 </it>1858C/T polymorphism is associated with anti-cyclic citrullinated peptide antibody-positive early rheumatoid arthritis in northern Sweden</p> Kokkonen Heidi Johansson Martin Innala Lena Jidell Erik Rantapää-Dahlqvist Solbritt solbritt.rantapaa.dahlqvist@medicin.umu.se

Department of Rheumatology, University Hospital, SE-901 85 Umeå, Sweden

Department of Transfusion Medicine, University Hospital, SE-901 85 Umeå, Sweden

 Arthritis Research & Therapy 1478-6354 2007 9 5 403 http://arthritis-research.com/content/9/5/403 See related research article by Kokkonen et al., http://arthritis-research.com/content/9/3/R56 10.1186/ar2312 25 10 2007 2007 BioMed Central Ltd

After publication of our recent article 1, we noticed an error in Table 6 'Relative risk for developing rheumatoid arthritis in patients, stratified for anti-cyclic citrullinated peptide (anti-CCP) antibodies'.

Under the heading of 'Anti-CCP antibody-positive', the first line should read 'HLA-shared epitope-negative', and the second line should read 'HLA-shared epitope-positive'. Similarly, under the heading 'Anti-CCP antibody-negative', the first line should read 'HLA-shared epitope-negative' and the second line should read 'HLA-shared epitope-positive'.

The correct table is given here as Table 1 (a corrected version of Table 6 1).

<p>Table 1</p>

Relative risk for developing rheumatoid arthritis in patients, stratified for anti-cyclic citrullinated peptide (anti-CCP) antibodies

Nonsmoking

Smoking

Cases/controls

Relative risk (95% confidence interval)

Cases/controls

Relative risk (confidence interval)

Anti-CCP antibody-positive

HLA-shared epitope-negative

33/41

1.00

71/49

1.67 (0.95–2.94)

HLA-shared epitope-positive

62/33

2.05 (1.12–3.75)

143/21

7.61 (4.05–14.30)

Anti-CCP antibody-negative

HLA-shared epitope-negative

40/41

1.00

52/49

1.11 (0.63–1.95)

HLA-shared epitope-positive

23/33

0.71 (0.37–1.38)

31/21

1.92 (0.98–3.77)

The combination of carriage of HLA-shared epitope alleles or not, and ever or never smoking were compared for groups stratified for anti-CCP antibodies.

 <p>The PTPN22 1858C/T polymorphism is associated with anti-cyclic citrullinated peptide antibody-positive early rheumatoid arthritis in northern Sweden</p> Kokkonen H Johansson M Innala L Jidell E Rantapää-Dahlqvist S Arthritis Res Ther 2007 9 R56 10.1186/ar2214 17553139