This is a multicenter, Phase II, open-label, single-dose level (6 mg/kg) study of PRL3-zumab monotherapy in patients with unresectable or metastatic solid tumors.
The study consists of a screening period (Day -21 to Day -1, during which all screening assessments must be completed prior to the first administration of study treatment), a treatment period (study visits every 2 weeks), an End-of-Treatment (EOT) visit (to beconducted within 14 days after discontinuation of treatment for any reason), a safety follow up visit (30 days after the last dose of study treatment), and survival follow-up (every 3 months after treatment discontinuation via telephone or other appropriate methods until the data cutoff date). PRL3-zumab will be administered via intravenous (i.v.) infusion until patients meet discontinuation criteria (clinically determined disease progression or disease progression confirmed according to RECIST v1.1 and iRECIST, intolerable toxicity, or withdrawal of consent). One treatment cycle is defined as 4 weeks (two infusions given 2 weeks apart).
Patients will undergo safety assessments, including laboratory tests, prior to each infusion within each cycle.
Tumor assessments will be performed at baseline according to RECIST v1.1 and iRECIST and every 8 weeks after initiation of study treatment. Quality of life (QoL) will be assessed at screening and every 8 weeks during treatment. Study treatment will be discontinued if patients develop clinically determined disease progression, disease progression per RECIST v1.1 and iRECIST, intolerable toxicity, or withdraw consent. The EOT visit will be conducted within 14 days after the last dose of study treatment.
For the intensive PK sampling subgroup (N = 10), pharmacokinetic assessments will be performed at the following time points: Cycle 1 Day 1 (pre-dose, end of infusion, 2 and 6 hours post-infusion), Cycle 1 Day 2 (24 hours post-infusion), Cycle 1 Day 6 (120 hours post infusion), Cycle 1 Day 10 (216 hours post-infusion), Cycle 1 Day 15 (pre-dose), Cycle 2 Day 1 (pre-dose), Cycle 2 Day 15 (pre-dose), Cycle 3 Day 1 (pre-dose), Cycle 3 Day 15 (pre-dose, end of infusion, 2 and 6 hours post-infusion), Cycle 3 Day 16 (24 hours post infusion), Cycle 3 Day 20 (120 hours post-infusion), Cycle 3 Day 24 (216 hours post infusion), Cycle 4 Day 1 (pre-dose), Cycle 5 Day 1 (pre-dose), Cycle 6 Day 1 (pre-dose), and End of Treatment.
For the sparse PK sampling subgroup (N = 10), PK assessments will be performed at Cycle 1 Day 1 (pre-dose and end of infusion), Cycle 1 Day 15 (pre-dose), Cycle 2 Day 1 (pre-dose and end of infusion), Cycle 3 Day 1 (pre-dose and end of infusion), and End of Treatment Immunogenicity assessments will be performed prior to dosing on Cycle 1 Day 1 and prior to infusion in Cycles 2, 4, and 6. Thereafter, if the patient continues treatment, immunogenicity assessments will be conducted every 3 cycles.