Clazakizumab is an anti-IL-6 MAB. I haven't
written much on clazakizumab so far. Last year at the ACR 2013 Meeting in San
Diego there had been a poster/abstract on clazakizumab, on which clazakizumab showed a higher potency than tocilizumab [#2385]. But will
this be an advantage? Tocilizumab SC is already available and is still might
take a while until clazakizumab comes to the market.
S. Du and colleagues presented the following
study [SAT0210]: "X-RAY AND MRI RESULTS FROM A PHASE IIB
STUDY OF
SUBCUTANEOUS ANTI-INTERLEUKIN-6 MONOCLONAL ANTIBODY
CLAZAKIZUMAB WITH OR WITHOUT MTX IN ADULTS WITH MODERATE-TO-SEVERE ACTIVE RA
AND INADEQUATE RESPONSE TO CONVENTIONAL DMARDS INCLUDING METHOTREXATE".
Conclusions: Clazakizumab in combination with
MTX demonstrated reduced progression of joint damage by MRI as early as 12
weeks and by X-ray after 24 weeks. Larger trials with clazakizumab in RA are
warranted to confirm these findings." But good as preliminary data!
M. Weinblatt and colleagues presented [SAT0244]: "A
PHASE IIB STUDY OF THE EFFICACY AND SAFETY OF SUBCUTANEOUS CLAZAKIZUMAB
(ANTI-IL-6 MONOCLONAL ANTIBODY) WITH OR WITHOUT METHOTREXATE IN ADULTS WITH
MODERATE-TO-SEVERE ACTIVE RHEUMATOID ARTHRITIS AND AN INADEQUATE RESPONSE TO
METHOTREXATE". N=418 patients were randomized! In results we find: " The rates of serious adverse events ranged from 8.3 to 13.3% in CLZ
arms versus 3.3% for pbo ...". Conclusions: "Clazakizumab as monotherapy or in combination with MTX demonstrated
efficacy in controlling the signs and symptoms of RA. At Week 24, remission
rates with clazakizumab + MTX trended higher than with ADA + MTX. Its safety
profile was consistent with the known pharmacology of IL-6 blockade.
Clazakizumab is a promising future treatment for RA that warrants further
investigation." Still too early to call us off safety concerns!
E. Alemao and colleagues presented [AB0423] "IMPACT
OF ANTI-IL-6 MONOCLONAL ANTIBODY, CLAZAKIZUMAB, ON PATIENT-REPORTED OUTCOMES IN
PATIENTS WITH RHEUMATOID ARTHRITIS AND AN INADEQUATE RESPONSE TO METHOTREXATE
IN A PHASE IIB STUDY".
Conclusions: Treatment with clazakizumab
with or without MTX resulted in improvements in multiple PROs and a greater
proportion of patients achieved MCID (minimal clinically important differences) on these PROs (patient-reported
outcomes) compared with MTX alone in patients with RA
with an inadequate response to MTX."
Promising drug candidate, but still has to present phase 3 studies. I
hope there won't be new safety concerns as I'm already alerted by the 8.3% to 13.3% serious adverse events in the clazakizumab
arms versus 3.3% for placebo [SAT0244]; the authors of
the study call the safety profile consistent with the
known pharmacology of IL-6 blockade, however. Maybe, we'll get a new drug, but as
there already exists an approved anti-IL-6 MAB, where's the niche for this one?
Hopefully the company answers this question before coming to the market.
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