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Monoclonal antibody
Type Whole antibody
Source Mouse
Target IL-6
Clinical data
ATC code
  • none
CAS Number
  • none
 NYesY (what is this?)  (verify)

Elsilimomab (also known as B-E8) is a mouse monoclonal antibody[1] and an immunosuppressive drug.[citation needed]

It (OPR-003) targets (and blocks) Interleukin-6.[2]

It has undergone a number of early stage clinical trails, e.g. for lymphoma and myeloma.[3]

It was used as a template to develop a high-affinity, antagonist, fully human anti-IL-6 mAb 1339.[3]


  1. ^ "WHO Drug Information" (PDF). p11:immunoglobulin G1, anti-(human interleukin 6) (mouse monoclonal B-E8 heavy chain), disulfide with mouse monoclonal B-E8 k-chain, dimer 
  2. ^ "First Fully Human Anti-IL6 Antibody Under Development". Oct 2006. 
  3. ^ a b Fulciniti; Hideshima, T; Vermot-Desroches, C; Pozzi, S; Nanjappa, P; Shen, Z; Patel, N; Smith, ES; et al. (2009). "A high-affinity fully human anti-IL-6 mAb (OP-R003-1, 1339) for the treatment of Multiple Myeloma". Clinical Cancer Research. 15 (23): 7144–52. PMC 2787636Freely accessible. PMID 19934301. doi:10.1158/1078-0432.CCR-09-1483.