TPS469 Background: LIV-1 is a transmembrane protein with putative zinc transporter and metalloproteinase activity. It has been linked to the epidermal-to-mesenchymal transition that leads to malignant progression and metastasis. Ladiratuzumab vedotin (LV), also known as SGN-LIV1A, is an investigational antibody-drug conjugate (ADC) targeting LIV-1 that is composed of a humanized IgG1 monoclonal antibody conjugated to monomethyl auristatin E (MMAE) via a protease-cleavable linker. MMAE-linked ADCs can induce mitotic arrest and immunogenic cell death. In a phase 1 study, LV was well tolerated and showed antitumor activity in heavily pretreated patients (pts) with metastatic breast cancer (Modi et al 2017). The current study was initiated to evaluate LV in previously treated pts with advanced upper aerodigestive tract malignancies. Methods: SGNLVA-005 (NCT04032704) is an open-label, phase 2 study evaluating LV monotherapy (2.5 mg/kg IV every 3 weeks) for pts with the following advanced malignancies: gastric and gastroesophageal junction (GEJ) adenocarcinoma, esophageal squamous cell carcinoma, small cell lung cancer, non-small cell lung cancer (NSCLC)-squamous, NSCLC-nonsquamous, and head and neck squamous cell carcinoma. Up to approximately 30 pts with unresectable locally advanced or metastatic disease, measurable disease per RECIST v1.1, an ECOG score of 0 or 1, and adequate organ function are enrolling in each of the cohorts. Pts in the gastric and GEJ adenocarcinoma and esophageal squamous cell carcinoma cohorts must have received no more than 1 prior line of platinum-based cytotoxic chemotherapy and pts in the gastric and GEJ adenocarcinoma cohort should have received prior anti-PD(L)1 therapy if indicated. The study consists of a 2-stage design that includes a Bayesian predictive probability of success approach to determine futility criteria. Study objectives include objective response rate (primary); safety and tolerability, disease control rate, duration of response, progression-free and overall survival, and pharmacokinetics and immunogenicity (all secondary); and pharmacodynamics. Study enrollment is ongoing in North America. Pts will also enroll in Europe and Asia. Clinical trial information: NCT04032704.
Randomized, open-label, phase III study comparing irinotecan plus S-1 with S-1 alone in patients with advanced esophageal squamous cell carcinoma after failure of prior platinum- or taxane-based chemotherapy: Results of an interim analysis