Daratumumab Plus Lenalidomide Improves MRD Outcomes

RIO DE JANEIRO — The addition of daratumumab to lenalidomide maintenance therapy following autologous stem cell transplant (ASCT) significantly improves rates of achieving minimal residual disease (MRD) negativity and progression-free survival (PFS) among patients newly diagnosed with multiple myeloma (MM), new research showed.

“To date, no randomized trial has directly compared daratumumab-based maintenance therapy vs standard of care lenalidomide maintenance, which is the focus of our trial,” said first author Ashraf Z. Badros, MD, a professor of medicine at the Marlene and Stewart Greenebaum Comprehensive Cancer Center, University of Maryland Medical Center, Baltimore, in presenting the findings at the International Myeloma Society (IMS) 2024 on September 27 in Rio de Janeiro, Brazil.

“These results support the addition of daratumumab not only to induction/consolidation but also to standard of care lenalidomide maintenance for these patients,” he said of the study, which was published concurrently in the journal Blood.

Despite ongoing advancements in regimens for induction, consolidation, and maintenance posttransplant, most patients with MM eventually relapse, driving continuing efforts to optimize treatment strategies and improve long-term outcomes.

While daratumumab, an anti-CD38 monoclonal antibody, is approved in induction and consolidation with ASCT for patients with newly diagnosed MM, the authors sought to investigate the potential benefits of adding it to the standard-of-care therapy lenalidomide in maintenance therapy.

For the phase 3 AURIGA trial, they recruited 200 patients with newly diagnosed MM within 12 months of induction therapy and 6 months of ASCT.

The patients, who were all anti-CD38 naive, received at least four induction cycles, had at least a very good partial response, and were MRD-positive following ASCT.

They were randomized 1:1 to receive 28-day lenalidomide maintenance cycles either with (n = 99) or without (n = 101) subcutaneous daratumumab for at least 36 cycles or until disease progression, unacceptable toxicity, or withdrawal.

The patients had similar baseline demographic characteristics; their median age was about 62 years, and 25.3% in the daratumumab and 23.5% in the no-daratumumab group had ISS stage III disease. At the time of diagnosis, 23.9% and 16.9%, respectively, had high cytogenic risk.

Overall, patients received a median of five induction cycles prior to entering the study.

For the primary endpoint, the rate of conversion from MRD-positive to MRD-negative (at a sensitivity of 10-5 using next-generation sequencing) by 12 months was significantly higher in the daratumumab group than in the lenalidomide-only group, at 50.5% vs 18.8% (odds ratio [OR], 4.51; P< .0001).

A similar benefit with the daratumumab group was observed across all clinically relevant subgroups, including patients with high-risk disease.

The MRD-negative conversion rate was similar at the 10-6 threshold (23.2% vs 5%; OR, 5.97; P = .0002).

At a median follow-up of 32.3 months, the overall rates of MRD negativity were 60.6% and 27.7%, with and without daratumumab, respectively (OR, 4.12; P< .0001)

The achievement of complete response or better also was significantly greater with daratumumab (75.8% vs 61.4%; OR, 2.00; P = .0255).

Likewise, PFS favored daratumumab (hazard ratio, 0.53), and the estimated 30-month PFS rates were 82.7% and 66.4%, respectively.

The daratumumab group received more maintenance cycles than the lenalidomide-only group (median of 33 vs 21.5), and it had higher rates of completion of 12 cycles (88.5% vs 78.6%). Badros noted that the main reason for discontinuation of therapy in the no-daratumumab arm was disease progression.

Consistent with previous studies, daratumumab was associated with more grade 3/4 treatment-emergent adverse events (TEAEs), occurring in 74.0% patients vs 67.3% patients not receiving daratumumab, including infections (18.8% vs 13.3%), cytopenia (54.2% vs 46.9%), and neutropenia (46.9% vs 41.8%). Badros noted the significantly longer time of treatment in the daratumumab arm (30 months vs 20 months).

Serious TEAEs occurred in 30.2% daratumumab patients and 22.4% no-daratumumab patients, and fatal TEAEs occurred in 2.1% and 1.0% patients, respectively.

“Overall, there were no new safety concerns for daratumumab,” he said.

The authors noted that the requirement that patients be anti-CD38–naive was partially due to “the D-VRd [daratumumab combined with bortezomib, lenalidomide, and dexamethasone] regimen gaining popularity and increased utilization in the myeloma community for transplant-eligible patients with NDMM, even before the publication of the long-term results of the randomized GRIFFIN and PERSEUS studies.”

A key question, remarked Joseph Mikhael, MD, who is chief medical officer of the International Myeloma Foundation, from the audience, is how applicable the findings are in the modern environment, where most patients now have indeed had prior anti-CD38 treatment.

In response, Badros explained that, “I think this is an important study because it is probably one of the few studies that separates the impact of daratumumab-lenalidomide without prior daratumumab use.”

Badros noted that results from the PERSEUS trial, of D-VRd, show MRD-positive to MRD-negative conversion rates that are similar to the current trial; “therefore, I really don’t think that using daratumumab up front will prevent using it as maintenance,” he said. “If anything, it actually improves outcomes.”

The findings from continuous treatment “are an important reminder that high-risk patients do not do well if you stop treatment,” he said.

Further commenting on the research at the meeting, María-Victoria Mateos, MD, PhD, an associate professor of medicine at the University of Salamanca, Salamanca, Spain, noted that “the unmet need in maintenance is to upgrade the quality of the response and to increase the conversion of MRD-positivity to MRD-negative in order to delay the progression of the disease and prolong the overall survival.”

Regarding the AURIGA trial, “this is very interesting data about the role of daratumumab-lenalidomide maintenance in patients who are MRD-positive after autologous stem cell transplantation.”

“What is more important is we are progressing in response-adaptive therapy, and we are generating very useful information to possibly make the majority of patients become MRD-negative.”

“Developing early endpoints as surrogate markers for long-term outcomes and overall survival is critically important,” she added. “Otherwise, trials may continue for more than 15 years.”

The study was sponsored by Janssen Biotech, Inc. Badros reported relationships with Bristol Myers Squibb, BeiGene, Roche, Jansen, and GSK. Mateos disclosed ties with AbbVie, Amgen, Bristol Myers Squibb, GSK, Kite, Johnson & Johnson, Oncopeptides, Pfizer, Regeneron, Roche, and Sanofi.