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Purpose: MORAb-202, an antibody–drug conjugate containing farletuzumab and eribulin with a cathepsin-B cleavable linker, targets folate receptor α (FRα)–expressing tumor cells. The primary objective of this first-in-human study was to evaluate the safety and tolerability of MORAb-202 in patients with solid tumors. Patients and Methods: Patients ≥20 years with adequate organ function and FRα-positive solid tumors who failed to respond to standard therapy were eligible. Patients received MORAb-202 intravenously at doses of 0.3 to 1.2 mg/kg once every three weeks. Endpoints included dose-limiting toxicities, safety, tumor responses, pharmacokinetics, and pharmacodynamics. Trial registration number: NCT03386942 (ClinicalTrials.gov). Results: Between November 28, 2017 and June 4, 2019, 22 patients (median age, 58.0 years) with advanced solid tumors were enrolled. Treatment-emergent adverse events occurred in 21 (95%) patients, with leukopenia and neutropenia in 10 (45%) patients each. One patient (0.9 mg/kg cohort) experienced two grade 3 dose-limiting toxicities: serum alanine aminotransferase and γ-glutamyl transferase increases. Following review by an independent adjudication committee, grade 1/2 interstitial lung disease thought to be related to MORAb-202 was identified in five (23%) patients. Complete response, partial response, and stable disease were observed in one, nine, and eight patients, respectively. The normalized predose serum FRα tended to be positively correlated with the maximum tumor shrinkage (R2 = 0.2379; P = 0.0291). Conclusions: The MTD of MORAb-202 was not reached. MORAb-202 demonstrated promising antitumor activity in FRα-positive solid tumors and was generally well-tolerated at the tested doses. Further investigations are required to establish appropriate dosage and clinical utility of MORAb-202.

clinical cancer research

First-in-Human Phase 1 Study of MORAb-202, an Antibody–Drug Conjugate Comprising Farletuzumab Linked to Eribulin Mesylate, in Patients with Folate Receptor-α–Positive Advanced Solid Tumors