Sarclisa (isatuximab) – Anti CD38 Targeted Therapy for Myeloma

MedMaven

by Dr. C.H. Weaver M.D. 5/2020

In an update from the phase III ICARIA-MM trial presented at the 2019 American Society of Clinical Oncology meeting researchers reported that the combination of the anti-CD38 monoclonal antibody Sarclisa (isatuximab) with Pomalyst (pomalidomide) and dexamethasone (Pd) extended progression-free survival (PFS) to 11.5 months in patients with relapsed/refractory multiple myeloma (MM) which is nearly five months longer than with Pd alone.(3,4) This led to US Food and Drug Administration approval of Sarclisa in March of 2020. (5)

Multiple myeloma is the second most common hematologic malignancy, with more than 138,000 individuals diagnosed worldwide each year. Multiple myeloma remains incurable in the vast majority of patients, resulting in significant disease burden. (1,2)

About Sarclisa (isatuximab)

Sarclisa is a precision cancer medicine that targets a specific part of the CD38 antigen expressed on myeloma cells and is capable of triggering multiple, distinct mechanisms of action that are believed to promote programmed tumor cell death (apoptosis). CD38 is highly and uniformly expressed on multiple myeloma cells and is a cell surface receptor target for antibody-based therapeutics in multiple myeloma and other malignancies.

The current study evaluated the benefit of Sarclisa in combination with the standard of care on prolonging progression free survival as compared to standard of care in patients with relapsed/refractory multiple myeloma.

IKEMA Clinical Trial

Results from first planned interim analysis of the Phase 3 IKEMA trial comparing Sarclisa to Carfilzomib and Dexamethasone in recurrent myeloma and found that Sarclisa added to carfilzomib and dexamethasone (Sarclisa combination) reduced the risk of disease progression or death by 47% compared to standard treatment with carfilzomib and dexamethasone (Kd).

The Phase 3 IKEMA clinical trial enrolled 302 patients with relapsed MM across 69 centers spanning 16 countries. All study participants had received one to three prior anti-myeloma therapies. During the trial, Sarclisa was administered through an intravenous infusion at a dose of 10mg/kg once weekly for four weeks, then every other week for 28-day cycles in combination with carfilzomib twice weekly at the 20/56mg/m2 dose and dexamethasone at the standard dose for the duration of treatment. This is the second Phase 3 trial to demonstrate superior results with Sarclisa combination therapy over a standard of care regimen, adding to the growing body of evidence that our anti-CD38 monoclonal antibody has the potential to make a meaningful difference for patients.

About ICARIA-MM

The phase III randomized, open-label, multicenter ICARIA-MM trial included 307 patients with relapsed/refractory MM who had received at least two prior lines of therapy (including lenalidomide and a proteasome inhibitor [PI]). Participants also had disease that was refractory to their last therapy.(3,4)

Patients were treated with either Sarclisa plus Pd (n=154) or Pd alone (n=153) until disease progression or unacceptable toxicity and directly compared.

After an average follow-up period of 11.6 months from initiation of treatment the average time to cancer progression was 11.5 months with Sarclisa compared with 6.5 months for Pd. The overall survival duration has not yet been reached in either group. Overall 72% of Sarclisa treated patients survive one year from treatment compared to 63% for prednisone alone.

Dr. Richardson and colleagues from Dana Farber Cancer Institute concluded that the addition of Sarclisa to Pd resulted in significant improvement in overall and depth of response. Responses occurred more rapidly in the Sarclisa and nearly twice as many patients in the Sarclisa group achieved at least a partial response.

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Treatment appeared to be well tolerated, Dr. Richardson and colleagues reported, with patients receiving Sarclisa for a median of 41 weeks, compared with 24 weeks in the Pd alone group.Together, these safety and efficacy results suggest that Sarclisa plus Pd is “an important new treatment option for the management of relapsed/refractory MM,” Dr. Richardson concluded. However, these results will need to be confirmed in longer-term follow-up, and also compared with other monoclonal antibody–based regimens for MM.

References:

  1. Kazandjian. Multiple myeloma epidemiology and survival: A unique malignancy. Semin Oncol. 2016;43(6):676-681. doi:10.1053/j/seminoncol.2016.11.00.
  2. Cowan AJ, Allen C, BaracA, et al. Global Burden of Multiple Myeloma: A Systematic Analysis for the Global Burden of Disease Study 2016. JAMA Oncol. 2018;4(9):1221–1227. doi:10.1001/jamaoncol.2018.2128
  3. pharmatimes.com/news/isatuximab_shows_positive_results_in_phase_iii_trial_for_multiple_myeloma_1277416
  4. Richardson PG, Attal M, Rajkumar SV, et al. A phase III randomized, open label, multicenter study comparing isatuximab, pomalidomide, and low-dose dexamethasone versus pomalidomide and low-dose dexamethasone in patients with relapsed/refractory multiple myeloma (RRMM). Abstract #8004. Presented at the 2019 ASCO Annual Meeting, June 2, 2019; Chicago, IL.
  5. morningstar.com/news/globe-newswire/1000321742/sanofi-fda-approves-sarclisa-isatuximab-irfc-for-patients-with-relapsed-refractory-multiple-myeloma
  6. Sarclisa® (isatuximab) Phase 3 IKEMA trial meets primary endpoint early in patients with relapsed multiple myeloma
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