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EBV in RA patient marrow strongly predicts rituximab success

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Article:
Epstein-Barr virus in bone marrow of rheumatoid arthritis patients predicts response to rituximab treatment
– Source: Rheumatology (Oxford), Oct 2010

By Mattias Magnusson, et al.

[Note: To read the free full text of this article, which may be significant for CFS trials employing rituximab therapy, go to
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2936947/?tool=pubmed]

Abstract:
Objectives: Viruses may contribute to RA. This prompted us to monitor viral load and response to anti-CD20 therapy in RA patients.

Methods: Blood and bone marrow from 35 RA patients were analysed for CMV, EBV, HSV-1, HSV-2, parvovirus B19 and polyomavirus using real-time PCR before and 3 months after rituximab (RTX) treatment and related to the levels of autoantibodies and B-cell depletion.

Clinical response to RTX was defined as decrease in the 28-joint disease activity score (DAS-28) >1.3 at 6 months.

Results:

Before RTX treatment:

• EBV was identified in 15 out of 35 patients (EBV-positive group), of which 4 expressed parvovirus.

• Parvovirus was further detected in eight patients (parvo-positive group).

• Twelve patients were negative for the analysed viruses.

Following RTX:

• EBV was cleared, whereas parvovirus was unaffected.

• Eighteen patients were responders, of which 12 were EBV positive.

• The decrease in the 28-joint disease activity score was significantly higher in EBV-positive group compared with parvo-positive group (P=0.002) and virus-negative patients (P=0.04).

• Most of EBV-negative patients that responded to RTX (75%) required retreatment within the following 11 months

• Compared with only 8% of responding EBV-positive patients.

A decrease of RF, Ig-producing cells and CD19(+) B cells was observed following RTX but did not distinguish between viral infections. However, EBV-infected patients had significantly higher levels of Fas-expressing B cells at baseline as compared with EBV-negative groups.

Conclusions:

EBV and parvovirus genomes are frequently found in bone marrow of RA patients.

The presence of EBV genome was associated with a better clinical response to RTX.

Thus, presence of EBV genome may predict clinical response to RTX.

Source:
Rheumatology, Oct 2010; 49(10):1911-9.  Magnusson M, Brisslert M, Zendjanchi K, Lindh M, Bokarewa MI. Department of Rheumatology and Inflammation Research, Sahlgrenska University Hospital, Göteborg, Sweden. [Email: mattias.magnusson@rheuma.gu.se]

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