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A phase I safety and efficacy clinical trial of plocabulin and gemcitabine in patients with advanced solid tumors
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A phase I safety and efficacy clinical trial of plocabulin and gemcitabine in patients with advanced solid tumors
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A phase I safety and efficacy clinical trial of plocabulin and gemcitabine in patients with advanced solid tumors
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Journal Article
A phase I safety and efficacy clinical trial of plocabulin and gemcitabine in patients with advanced solid tumors
2024
Overview
SummaryPlocabulin (Plo) induces depolymerization of tubulin fibers with disorganization and fragmentation of the microtubule network leading to mitosis. Plo combined with gemcitabine (Gem) showed synergistic anti-tumor activity in preclinical studies. This phase I trial evaluated the safety, pharmacokinetics (PK) and efficacy of Plo 10-min infusion plus Gem on Day 1 and 8 every 3-week in patients with advanced solid tumors. Fifty-seven patients were enrolled into 8 dose levels (DLs); 74%: females; 74%: ECOG performance status 1; median age: 62 years; median number of prior lines of therapy:3. Dose-limiting toxicities (DLT) in Cycle 1 were grade (G) 3 intestinal obstruction at the maximum tolerated dose (MTD), G3 peripheral sensory neuropathy (PSN), G3 abdominal pain, and G4 thrombocytopenia (1 patient each). The highest DL (DL8: Plo 10.5 mg/m2/Gem 1000 mg/m2) was the MTD. Accrual into DL7 (Plo 10.0 mg/m2/Gem 1000 mg/m2) was stopped before it was formally defined as the recommended dose (RD). Most common treatment-related adverse events (AEs) were fatigue (56%), nausea (55%), diarrhea (31%); G3/4 hematologic toxicities comprised anemia (35%), neutropenia (27%) and thrombocytopenia (17%). No treatment-related deaths occurred. PK parameters for Gem or dFdU at all DLs were in line with reference values from the literature. Six of 46 evaluable pts were responders (overall response rate:13%). Of note, 2 partial responses (PR) and 2 stable disease (SD) ≥ 4 months occurred among 13 pts with ovarian cancer. The combination of Plo and Gem is well tolerated. The MTD was Plo 10.5 mg/m2/Gem 1000 mg/m2. No PK drug-drug interaction was found. The most encouraging outcome occurred in ovarian cancer patients.
