A reader asked me a couple of weeks ago if I reviewed presentations from the EHA Congress, the annual meeting of the European Hematology Association. It's the European equivalent of the ASH meeting in the United States. It happens soon after the ASCO conference. I have written about some EHA presentations in the past, but as I told him, I sometimes have trouble accessing their abstracts. So it hasn't been something I have done on a consistent basis. EHA has some excellent research. But it's always been a matter of access.
This year, I figured out how to look at EHA abstracts. And I had some incentive -- I got many notices about a particular presentation, "CLINICALLY RELEVANT SUBGROUP ANALYSIS FROM THE RANDOMIZED PHASE 3 EPCORE FL-1 TRIAL: TREATMENT (TX) EFFECT OF EPCORITAMAB WITH LENALIDOMIDE AND RITUXIMAB (R²) IN R/R FOLLICULAR LYMPHOMA (FL)."
The presentation is an update on the EPCORE FL -1 clinical trial. I wrote about this a few months ago.
First, some background. Epcoritamab is a bispecific, meaning it has two mechanisms working. On one side, it attaches to a protein on the surface of the cancerous B cell, and then also attaches to a protein on a T cell, an immune cell. In this way a bispecific uses the body's immune system to treat the cancer.
The EPCORE FL-1 trial is a phase 3 trial involving 488 patients with relapsed or refractory Follicular Lymphoma. Half of the patients received R-Squared (Lenalidomide + Rituxan) and the other half received R-Squared + Epcoritamab. The earlier results from late last year, with a median follow-up of 14.8 months, showed an Overall Response rate for the Epcoritamab group of 95% (versus 79% for the R-squared group). The Complete Response Rate was 83% for Epcoritamab and 50% for R-squared. The Progression-Free Survival for the Epcoritamab group was higher, with estimated PFS of 16 months in 85.5% of that group versus 40.2% in the R-squared group.
The updated results break down the comparison into some sub-groups to determine if the Epcoritamab combination holds up better for certain populations. What the researchers found was that Epcoritamab + R-Squared seems to work better than R-Squared alone no matter how they divided things up.
The results were better for the Epcoritamab group regardless of the age of the patients. For patients under 70 years old, The ORR was 96% versus 78% for the R-Squared group, and the Complete Response was 84% versus 50%. In patients 70 or older, the ORR was 91% versus 81% and the CR was 79% versus 50%.
When patients were divided into low versus intermediate/high comorbidity (with the NHL-5 scale, a measure of how other health issues like heart, lung, or kidney disease might affect survival), the Eporitamab group again did better. Those with low NHL-5 comorbidity in the Epcoritamab group had an ORR of 94% versus 76% for the R-Squared group, and a CRR of 81% versus 50%. In the NHL-5 High/intermediate group, the ORRs were 97% versus 84% and CRRs were 86% and 49%.
The same held up for patients who received one previous treatment (ORRs were 96% vs 80%, the CRRs were 87% vs 53%,) as well as two or more previous treatments (ORRs were 94% vs 78%, the CRRs were 77% vs 45%).All of that matters, of course, because it shows that the Epcoritamab combination will work no matter the population. One big concern for a "triplet" like this -- a combination of three different treatments -- is that there is the potential for three times the side effects. Patients who are older, or who have other health problems, or have been weakened by multiple treatments may have more problems with a triplet. But that wasn't the case here.
One more breakdown of the data in this presentation had to do with Lenalidomide, which has the potential for dangerous side effects. As part of the study, the researchers tried different levels of Lenalidomide -- at full strength, at 70%, and at 50%. But even with less Lenalidomide, the Epcoritamab triplet did better than the R-Squared.
So, to sum up, Epcoritamab on its own is very good. R-Squared is very good. Combined, they are all even better, without sacrificing safety.
I still have a few more ASCO presentations that I'm sifting through. I'll try to do the same with EHA presentations as well. More to come soon.