This is the first study using PF-03758309, an oral compound, in patients with advanced solid tumors. In this study different doses of PF-03758309 will be administered to different groups of patients. The study will assess the compound's safety, the blood levels of PF-03758309 during the treatment and the effect of the compound on the tumor cells.
The study was prematurely terminated on 26Jul2011 due to the undesirable PK characteristics of PF-03758309 and the lack of an observed dose-response relationship. There were no safety concerns that contributed to the study termination.
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
35
Oral PF-03758309 will be administered in capsules (once or twice daily) until toxicity, progressive disease, or patient refusal to continue on therapy. The starting dose is 1 mg once daily.
Pfizer Investigational Site
Santa Monica, California, United States
Pfizer Investigational Site
Aurora, Colorado, United States
Pfizer Investigational Site
East Melbourne, Victoria, Australia
Number of Participants With Cycle 1 Dose-limiting Toxicities (DLT)
DLT includes: Grade (GR) 4 neutropenia (NP) that persisted for \>7 consecutive days; Febrile NP; GR3 NP infection; GR4 thrombocytopenia (TP); GR3 TP with bleeding; Any other GR\>=3 toxicity not classified under Common Terminology Criteria for Adverse Events (CTCAE) blood or bone marrow (exception of nausea, vomiting, or diarrhea in subjects who received optimal treatment with antiemetics or anti-diarrheals); Failure to recover to an adequate condition to recommence study treatment after a 2-week delay; Failure to receive \>= 80% of planned PF-03758309 dose due to study drug related toxicity
Time frame: Baseline (up to 30 days prior to first study drug administration) till 28 days after the last treatment administration (end of Cycle 1 [28 days])
Number of Participants With Objective Response
Number of participants with objective response based on assessment of confirmed complete response (CR) or confirmed partial response (PR) according to RECIST. Confirmed CR defined as disappearance of all target lesions. Confirmed PR defined as ≥30% decrease in sum of the longest dimensions (LD) of the target lesions taking as a reference the baseline sum LD according to RECIST. Confirmed responses are those that persist on repeat imaging study ≥4 weeks after initial documentation of response.
Time frame: Baseline until the date of first documented progression or discontinuation from the study due to any cause, assessed every 2 months until when the last participant was discontinued due to disease progression in Month 27 of the study
Time to Tumor Progression (TTP)
Time in weeks from start of study treatment to first documentation of objective tumor progression or death due to cancer, whichever comes first. TTP was calculated as (first event date minus the date of first dose of study medication plus 1) divided by 7. Tumor progression was determined from oncologic assessment data (where data meet the criteria for progressive disease \[PD\])
Time frame: Baseline until the date of first documented progression or discontinuation from the study due to any cause, assessed every 2 months until when the last participant was discontinued due to disease progression in Month 27 of the study
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Duration of Response
Time in weeks from the first documentation of objective tumor response to objective tumor progression or death due to any cancer. Duration of tumor response was calculated as (the date of the first documentation of objective tumor progression or death due to cancer minus the date of the first CR or PR that was subsequently confirmed plus 1) divided by 7. DR was calculated for the subgroup of participants with a confirmed objective tumor response.
Time frame: Baseline until the date of first documented progression or discontinuation from the study due to any cause, assessed every 2 months until when the last participant was discontinued due to disease progression in Month 27 of the study
Maximum Observed Plasma Concentration (Cmax)
Time frame: predose, 0.5, 1, 2, 3, 5, 8, 10, 24 and 48 hours post dose, on Cycle 1 Day 8 and Cycle 2-4 Day 1 at pre-dose and 2 hours post morning dose, and on Cycle 1 Day 15 at predose, 0.5, 1, 2, 3, 5, 8 and 10 hours post morning dose
Time to Reach Maximum Observed Plasma Concentration (Tmax)
Time frame: predose, 0.5, 1, 2, 3, 5, 8, 10, 24 and 48 hours post dose, on Cycle 1 Day 8 and Cycle 2-4 Day 1 at pre-dose and 2 hours post morning dose, and on Cycle 1 Day 15 at predose, 0.5, 1, 2, 3, 5, 8 and 10 hours post morning dose
Area Under the Curve From Time Zero to Last Quantifiable Concentration (AUClast)
Area under the plasma concentration time-curve from zero to the last measured concentration (AUClast)
Time frame: predose, 0.5, 1, 2, 3, 5, 8, 10, 24 and 48 hours post dose, on Cycle 1 Day 8 and Cycle 2-4 Day 1 at pre-dose and 2 hours post morning dose, and on Cycle 1 Day 15 at predose, 0.5, 1, 2, 3, 5, 8 and 10 hours post morning dose
Area Under the Concentration-Time Curve From Time 0 to 12 Hours Post Morning Dose [AUC(0-12)]
Time frame: pre-dose and 12 hours post morning dose
Minimum Observed Plasma Trough Concentration (Cmin)
Time frame: predose, 0.5, 1, 2, 3, 5, 8, 10, 24 and 48 hours post dose, and on Cycle 1 Day 15 at predose, 0.5, 1, 2, 3, 5, 8 and 10 hours post morning dose
Area Under the Curve From Time Zero to End of Dosing Interval (AUCtau)
Time frame: predose, 0.5, 1, 2, 3, 5, 8, 10, 24 and 48 hours post dose, and on Cycle 1 Day 15 at predose, 0.5, 1, 2, 3, 5, 8 and 10 hours post morning dose
PAK (p21 Activated Kinase)-Related Pathway Molecule Expression Modulation by PF-03758309 in Tumor and Surrogate Tissue
Time frame: Screening, 0, 2, 4, and 72 hours post dose Cycle 2 Day 8. A 6th sample of hair follicle could be requested at 6 or 8 hours post-dose if necessary. For fresh tumor tissue, baseline and between Day 8 and 22 of Cycle 1 in participants with accessible tumors
Baseline Tumor Expression of PAK-related Pathway Molecules and Other Known Biomarkers
Time frame: Baseline