Myeloma: FDA Advisers Greenlight Early CAR-T

Describing Risks to Patients

ODAC panelists also stressed a need to help patients understand what’s known — and not yet known — about these CAR-T therapies. It will be very challenging for patients to understand and interpret the data from key studies on these medicines, said ODAC panelist Susan Lattimore, RN, of Oregon Health & Science University. She suggested the FDA seek labeling that would be “overtly transparent” and use lay terms to describe the potential risks and benefits.

In its presentations to the FDA and ODAC, J&J noted that the COVID pandemic has affected testing and that the rate of deaths flips in time to be higher in the comparator group.

In its briefing document for the meeting, BMS emphasized that most of the patients in the ide-cel arm who died in the first 6 months of its trial did not get the study drug. There were 9 deaths in the standard-regimen arm, or 6.8% of the group, compared with 30, or 11.8% in the ide-cel group.

In the ide-cel arm, the majority of early deaths (17/30; 56.7%) occurred in patients who never received ide-cel treatment, with 13 of those 17 dying from disease progression, the company said in its briefing document. The early death rate among patients who received the allocated study treatment was similar between arms (5.1% in the ide-cel arm vs 6.8% in the standard regimen arm),the company said.

In the staff briefing, the FDA said the median PFS was 13.3 months in the ide-cel arm, compared with 4.4 months in the standard of care (SOC) arm. But there was a “clear and persistent increased mortality” for the ide-cel group, compared with the standard regimen arm, with increased rates of death up to 9 months. In addition, the overall survival disadvantage persisted to 15 months after randomization, when the survival curves finally crossed, the FDA staff said in its March 15 presentation.

ODAC Chairman Ravi A. Madan, MD, of the National Cancer Institute, was among the panelists who voted “no” in the ide-cel question. He said the risk-benefit profile of the drug does not appear favorable at this time for expanded use.

“There’s a lot of optimism about moving these therapies earlier in the disease states of multiple myeloma,” Dr. Madan said, calling the PFS data “quite remarkable.

“But for me this data at this level of maturity really didn’t provide convincing evidence that ide-cel earlier had a favorable risk benefit assessment in a proposed indication.”

ODAC panelist Christopher H. Lieu, MD, of the University of Colorado, said he struggled to decide how to vote on the ide-cel question and in the end voted yes.

He said the response to the treatment doesn’t appear to be as durable as hoped, considering the significant burden that CAR-T therapy imposes on patients. However, the PFS data suggest that ide-cel could offer patients with RRMM a chance for significant times off therapy with associated quality of life improvement.

“I do believe that the risk-benefit profile is favorable for this population as a whole,” he said. “But it’s a closer margin than I think we would like and patients will need to have in-depth discussions about the risks and benefits and balance that with the possible benefits with their provider.”