In the Cartitude 1 trial, the strongest predictor of long-term remission with Siltacel was a lower burden of disease (measured by bone marrow percentage and soluble BCMA levels), rather than the number of prior treatments. This implies using CAR-T therapy earlier in the disease course is more effective.

Moving CAR T-cell therapy to earlier treatment lines is crucial. This approach targets cancer before it develops resistance and, more importantly, utilizes patient T-cells that are healthier and more effective, not having been damaged by extensive prior chemotherapy regimens.

For third-line follicular lymphoma, where both CAR-T and bispecifics are approved, experts are leaning towards CAR-T. The long-term follow-up data for CAR-T suggests a potential for cure, making it a more compelling option for eligible patients despite logistical challenges.

In a crowded multiple myeloma market, treatment sequencing is critical. The International Myeloma Working Group (IMWG) recommends using BCMA CAR-T therapies like Carvykti before BCMA bispecifics. This guidance helps defend Carvykti's position, as prior bispecific use may reduce CAR-T efficacy.

Clinicians must weigh the immediate benefit of using community-accessible belantumab against the risk of reducing the efficacy of future BCMA-targeted therapies like CAR-T or bispecifics. This decision hinges on a patient's ability to travel and access advanced care, creating a complex treatment sequencing challenge.

In follicular lymphoma, the treatment goal is durable remission with manageable toxicity, not necessarily a cure. Therefore, clinicians frequently prefer using a bispecific antibody first, reserving the more complex and toxic CAR-T cell therapy for transformed disease or after a bispecific fails.

A convergence of data from pivotal trials (MAJESTIC, CARTITUDE) establishes that BCMA-directed therapies, including CAR-T and bispecifics, provide superior outcomes in early relapse. This marks a paradigm shift, making them the new standard of care after initial therapy failure, even in patients refractory to prior common treatments.

Using a BCMA bispecific antibody first can exhaust a patient's T-cells or cause tumors to lose the BCMA target, rendering a subsequent BCMA-targeted CAR-T therapy ineffective. The optimal sequence is CAR-T first, which preserves T-cell function and BCMA expression, leaving bispecifics as a viable later-line option.

Belantamab's primary mechanism, immunogenic cell death, does not exhaust T-cells. This unique quality allows clinicians to use it as a first BCMA-targeted agent without compromising the efficacy of subsequent T-cell redirecting therapies like CAR T or bispecifics.