The Blood Cancer Journal just published an article called "Lenalidomide and Rituximab for Relapsed/Refractory Follicular Lymphoma: A Systematic Review and Meta-Analysis."
We're at a point now where R-squared (Lenalidomide/Revlimid + Rituxan) is pretty firmly a part of our lives as Follicular Lymphoma patients. It's a standard treatment, the first option approved that showed to be as effective as traditional chemotherapy (but with a different set of side effects). It has been with us for about 7 years now as an approved treatment.
So this article is a "systemic review" of what we know about R-squared. It looks at all of the research that has been done since 2015, when the first stage 2 clinical trial results were published, on R-squared in Relapsed/Refractory FL. The aim here is to see if all of the results show the same thing, especially when compared to the AUGMENT trial that led to the approval.
The authors wanted to look at as wide a pool as possible, so in addition to looking at just R-squared, they also looked at Lenalidomide + Obinutuzumab, which like Rituxan is an anti-CD20 monoclonal antibody. They also looked at triplets -- R-squared + some other lymphoma treatment. Finally, they looked at not just published research, but also at research that was presented at ASH, the largest hematology conference in the U.S., and EHA, the largest conference in Europe.
Looking at so many sources of data is great, in that it gives them much more to work with. But it also complicates things. Each study had its own criteria for inclusion, so the patients across the studies don't match up with each other exactly. Some studies, especially those from the conferences, did not include all of the data that the published studies did. And some studies used slightly different dosing, so patients didn't get the same amount of the treatment across all of the studies.
All that said, they were able to do some analysis that made it possible to compare the different studies.
The results of their analysis aren't surprising -- R-squared works.
The Overall Response Rate for all of the R-squared or Lenalidomide + Obinutuzumab studies was 75.9%, and the Complete Response Rate was 39.6%. For studies involving a triplet (R-squared + another lymphoma treatment), the ORR was 85.1% and the CRR was 53.9%. This makes sense -- a third treatment will, in theory, add another way for the cancer cells to be treated. But something else happened, too, that also makes sense -- the rates of serious side effects went up, too.
In case you are curious about what the third treatment was in those triplets, they were Idelalisib; Polatuzumab; Atezolizumab; Bendamustine; ViPOR [a combination of 5 treatments, not three -- Venetoclax, Ibrutinib, Prednisone, Obinutuzumab, and Revlimid]; Tazemetostat; Acalabrutinib; Epcoritamab; Azacitidine; and Tafasitamab. Some of those names are probably familiar to you, and I have written about a bunch of these trials over the years. You can search for them at the top of the page.
The analysis also broke down the data in a few other ways, including prior lines of therapy. They wanted to see if R-squared was more or less effective if someone had already tried a number of other treatments. If a treatment works when others don't, that's an important piece of data. In studies where patients had received a median of just one prior treatment, the ORR was 76.7% and the CRR was 41.9%. For patients who had received a median of two or more prior treatments, the ORR was 73.5% and the CRR was 40.5%. There was no significant difference between the two -- R-squared works well no matter how many prior treatments a patient had received. The same was true for the triplets.
As for safety, as mentioned above, there were greater numbers of serious side effects for the triplets. Serious low white blood cell counts occurred in 46.6% of triplet patients, and just 29.1% of R-squared patients. There was a trend toward serious respiratory infections in the triplet patients vs. the R=Squared patients. Low platelet counts were similar in the two groups. Patients who had to leave the study because of serious side effects were also similar -- 23.3% in the triplet group and 16.6% on the R-squared group.
There are other data breakdowns that you can read about in the article. Click the link.
Overall, the analysis shows the effectiveness of R-squared and begins to look at some of the effectiveness of triplets, though they are generally more recent and will need more time to see long-term results. If you've been reading for a while, you now I like those "Here's where we are" articles and videos where an expert gives us an update on things that have happened in the past. I see this as one of those articles. It's clear the R-squared is effective and safe for Refractory and Relapsed patients and provides and important option for those of us in that situation.