United Therapeutics announced topline results from the phase 2/3 DISTINCT clinical study evaluating Unituxin (dinutuximab) Injection added to irinotecan compared to irinotecan or topotecan alone in patients with relapsed or refractory small cell lung cancer (SCLC). The DISTINCT trial did not meet its primary efficacy objective of extending the overall survival with Unituxin and irinotecan versus using irinotecan alone. The safety profile of dinutuximab in DISTINCT was consistent with prior studies and the current Unituxin product label.

DISTINCT was a two-part, open label, randomized, international, multi-center study of dinutuximab and irinotecan versus irinotecan for second line treatment of patients with relapsed or refractory small cell lung cancer. The phase 2 portion of the study of 12 patients was completed in October 2017. Global enrollment in the phase 3 portion of the study was completed in October 2018 with a total of 471 patients. Patients were randomized 2:2:1 into three arms: irinotecan (190 patients); irinotecan and dinutuximab (187 patients); or topotecan (94 patients). This event-driven study was conducted in 198 centers from 22 countries in North America, Europe, and Asia-Pacific, with 312 observed deaths in the dinutuximab plus irinotecan and irinotecan alone groups as of the data extract used for analysis. The primary objective of this study was to compare overall survival (OS) in patients treated with dinutuximab and irinotecan versus patients treated with irinotecan alone as a second-line treatment for relapsed or refractory small cell lung cancer (SCLC).

Full data from the DISTINCT study will be made available through scientific disclosure at upcoming conferences and in peer-reviewed publications.  

About Unituxin (dinutuximab)

Unituxin (dinutuximab) is a GD2-binding monoclonal antibody. It has been approved by the FDA for use in combination with granulocyte-macrophage colony-stimulating factor (GM-CSF), interleukin-2 (IL-2), and 13-cis-retinoic acid (RA), for the treatment of pediatric patients with high-risk neuroblastoma who achieve at least a partial response to prior first-line multiagent, multimodality therapy.

About Small Cell Lung Cancer

SCLC is the most aggressive form of lung cancer. It usually starts in the breathing tubes (bronchi) in the center of the chest. Although the cancer cells are small, they grow very quickly and create large tumors. These tumors often spread rapidly (metastasize) to other parts of the body, including the brain, liver, and bone.

Source: United Therapeutics

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