DLBCL: Glofitamab Plus Chemo Boosts Survival

Improved Accessibility Vs CAR-T Therapy

Among key developments in the treatment of R/R DLBCL has been the advent and approval of potentially highly effective CAR T-cell therapy, with the anti-CD19 CAR T cell isiocabtagene maraleucel also FDA approved in the non–transplant eligible DLBCL second-line setting.

Asked in the press briefing about the role of glofitamab GemOx in relation to CAR T cell’s significant benefits, Dr. Abramson underscored the important limitations in CAR T-cell accessibility.

“What I would say is a rising tide lifts all boats,” he responded. “It’s great to have multiple effective immunotherapy strategies.”

However, “CAR T cells of course are not available to most people in the US or worldwide,” he explained.

“They are more difficult to access, they require lymphodepleting chemotherapy, and so ultimately, the majority of patients who could potentially benefit from a CAR T cell probably don’t have access to them in the first place.”

He noted that “the appeal of a regimen like [glofitamab] is that it is an off-the-shelf, targeted immunotherapy combined with a well-tolerated chemotherapy backbone and should be more broadly accessible outside of just tertiary care centers in major cities.”
 

Long-Term Durability?

Looking ahead, Dr. Abramson noted that a key issue of focus is how long the encouraging results actually last.

“The major ongoing question with this trial is the long-term durability of remissions,” he said.

“Thus far, with a median of 21 months of follow-up for overall survival, the results are encouraging but longer follow-up is needed,” he added.

“Further trials are needed in a broader large B-cell lymphoma population as this trial was limited to DLBCL not otherwise specified, so did not include patients with transformed lymphoma, primary mediastinal B-cell lymphoma, high grade B-cell lymphoma, etc.” 
 

Is Chemo Necessary?

Commenting on the findings, Jonathan W. Friedberg, MD, director of the Wilmot Cancer Institute, University of Rochester School of Medicine, in Rochester, New York, underscored that, “given the overall survival benefit, these findings are clearly clinically significant.”

Noting that “these results add to evidence of high activity of bispecific antibodies in this disease,” Dr. Friedberg speculated on the role of chemotherapy with the therapy.

“Indeed, an important question in this study is whether the addition of chemotherapy to glofitamab is necessary, as high response rates with durable responses in patients who achieve complete remission have been demonstrated with single agent bispecific antibody therapy,” he said. 

With the durability of CAR T therapy shown in long-term follow-up of trials to exceed 5 years, Dr. Friedberg added that “it is not known how bispecific antibody therapy, with or without chemotherapy, compares to CAR T-cell therapy and how to sequence CAR T and bispecific antibody therapy.”

Dr. Friedberg agreed that longer-term results are needed get a clearer, fuller picture of the therapy’s effects.

“I have no doubt that the overall survival benefit will endure, but in DLBCL our goal should be cure, and whether glofitamab cures as many patients as CAR T-cell therapy is not currently known and will require further follow-up of this and other trials.”

The study was sponsored by F. Hoffman-La Roche Ltd. Dr. Abramson reported ties with AbbVie, ADC Therapeutics, AstraZeneca, BeiGene, BMS, Cellectar, Caribou Biosciences, Celgene, Genentech, Gilead, Incyte, Interius, Janssen, Lilly, Novartis, F. Hoffmann-La Roche Ltd, Seagen, and Takeda. Dr. Friedberg had no disclosures.