What’s next in diffuse large B-cell lymphoma (DLBCL) treatment? Dr. Justin Kline reviews developing research that could transform the future of DLBCL treatment.
Dr. Justin Kline is the Director of the Lymphoma Program at the University of Chicago Medicine. Learn more about Dr. Kline, here.
What about emerging therapies, Dr. Kline? What approaches are showing promise?
Well, I think probably in DLBCL, the biggest breakthrough, I don’t even know that I can call it emerging at this point, because it’s on the market, so to speak.
But I think it’s important to talk about, again, is CAR T-cell therapy, and this is a type of immune therapy where a person’s own immune cells called T-cells are taken from his or her bloodstream. And then using a special type of a virus, those T-cells are manipulated or engineered, that sounds better, to express on their surface something called a chimeric antigen receptor, which is somewhere between an antibody and a normal T-cell receptor. But anyhow, this chimeric antigen receptor confers or allows the T-cell to recognize a protein that’s expressed on the surface of B-cells, cancerous or otherwise, called CD19. And when that chimeric antigen or CAR antigen, excuse me, that CAR receptor expressing T-cell sees a lymphoma cell, it engages it and kills it, a pretty clever idea which has been in the works for decades now.
But CAR T-cell therapy has now been approved for not only DLBCL but many other types of non-Hodgkin lymphoma. And I think in the past decade, far and away, that’s the biggest breakthrough. There are other types of immunotherapy, probably most notably a type called bispecific immunotherapy, which is a pretty clever type of immune therapy where these specially engineered antibodies that are capable of binding or sticking to not only a person’s T-cell, a T-cell that’s already in his or her body, and a B-cell, a lymphoma cell that’s right next to that T-cell, sort of holds them together, and the part that binds the T-cell actually activates it, triggers it to kill the B-cell. And so there are a number of companies that have those bispecific therapies that are in development. I suspect a couple will be approved by the FDA, I would guess, in 2022.
These bispecific immunotherapies have been very effective, again, in DLBCL that’s come back, relapsed or refractory, as well as in other lymphomas. They do have some side effects that are similar to what we see in folks with CAR T-cell therapy. I won’t belabor what those are, but they are also very effective. There’ve been a number of drugs that, either immunotherapies or other types of therapies, that target that same CD19 protein on diffuse large B-cell lymphoma cells that have recently been approved by the FDA, either alone or in combination. Targeted therapies are always exciting. Although as compared with other lymphomas, these targeted therapies, many of which are oral, which are pills, have not been particularly effective in relapsed DLBCL.
So, I think that among the most exciting therapies are those that take advantage of our own immune systems to recognize and kill the lymphoma cells.