On April 11, 2025 Amgen (NASDAQ:AMGN) reported that the global Phase 3 DeLLphi-304 clinical trial evaluating IMDELLTRA (tarlatamab-dlle) as a treatment for patients with small cell lung cancer (SCLC) who progressed on or after a single line of platinum-based chemotherapy met its primary endpoint at a planned interim analysis (Press release, Amgen, APR 11, 2025, View Source [SID1234651892]). IMDELLTRA demonstrated statistically significant and clinically meaningful improvement in overall survival (OS) compared to local standard-of-care (SOC) chemotherapy.

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"Small cell lung cancer is one of the most aggressive malignancies, with a high unmet need for more effective therapies.1 The topline results from DeLLphi-304 demonstrate overwhelming clinical benefit for people living with this devastating disease and affirm IMDELLTRA as standard of care," said Jay Bradner, M.D., executive vice president, Research and Development, at Amgen. "We look forward to sharing these results with the scientific community and health authorities as we continue our efforts to bring IMDELLTRA to patients worldwide."

The safety profile for IMDELLTRA was consistent with its known profile. Detailed data from DeLLphi-304 will be presented at an upcoming medical congress.

DeLLphi-304 is a global Phase 3 randomized controlled open-label clinical trial evaluating the efficacy and safety of IMDELLTRA as a treatment for patients with SCLC who progressed on or after a single line of platinum-based chemotherapy.2 Patients were randomized to receive either IMDELLTRA or local SOC chemotherapy (topotecan in all countries except Japan; lurbinectedin in the U.S., Canada, Australia, Singapore, Korea; and amrubicin in Japan).2,3 The primary outcome measure of the trial is OS.2

About IMDELLTRA (tarlatamab-dlle)
IMDELLTRA is a first-in-class immunotherapy engineered by Amgen researchers that binds to both DLL3 on tumor cells and CD3 on T cells, activating T cells to kill DLL3-expressing SCLC cells. This results in the formation of a cytolytic synapse with lysis of the cancer cell.4,5 DLL3 is a protein that is expressed on the surface of SCLC cells in ~85-96% of patients with SCLC, but is minimally expressed on healthy cells, making it an exciting target.6,7

IMDELLTRA (tarlatamab-dlle) U.S. Indication
IMDELLTRA (tarlatamab-dlle) is indicated for the treatment of adult patients with extensive-stage small cell lung cancer (ES-SCLC) with disease progression on or after platinum-based chemotherapy.

This indication is approved under accelerated approval based on overall response rate and duration of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial(s).

About Small Cell Lung Cancer (SCLC)
SCLC is one of the most aggressive and devastating solid tumor malignancies, with a 5-10% five-year relative survival rate across all stages combined.1 SCLC comprises about 15% of the more than 2.4 million patients diagnosed with lung cancer worldwide each year.8-10 Despite initial high response rates to first-line platinum-based chemotherapy, most patients quickly relapse within months and require subsequent treatment options.9

About Tarlatamab Clinical Trials
Amgen’s robust tarlatamab development program includes the DeLLphi clinical trials, which evaluate tarlatamab as both a monotherapy and in combination regimens in earlier lines of SCLC.

Tarlatamab is being investigated in multiple studies including DeLLphi-303, a Phase 1b study investigating tarlatamab in combination with standard of care therapies in first-line ES-SCLC; DeLLphi-304, a randomized Phase 3 trial comparing tarlatamab monotherapy with standard of care chemotherapy in second-line treatment of SCLC; DeLLphi-305, a randomized Phase 3 trial comparing tarlatamab in combination with durvalumab versus durvalumab alone as first-line maintenance treatment in ES-SCLC; DeLLphi-306, a randomized placebo-controlled Phase 3 trial of tarlatamab following concurrent chemoradiotherapy in limited-stage SCLC; DeLLphi-308, a Phase 1b study evaluating subcutaneous tarlatamab in second line or later ES-SCLC; and DeLLphi-309, a Phase 2 study evaluating alternative intravenous dosing regimens with tarlatamab in second-line ES-SCLC.11

For more information, please visit www.tarlatamabclinicaltrials.com.