A First In Patient, Study Of Investigational Drug PF-03446962 In Patients With Advanced Solid Tumors

MTD was defined as highest dose level for which no more than 1 participant in a dose cohort experienced DLT and at least 2 out of 3/6 participants in the next higher dose. DLT was defined as any of the following events occurring during the first 42 days of study drug: any grade greater than or equal to 3 hematologic and non-hematologic toxicity, all non-disease-related adverse events (AEs).

RP2D was defined as the lower dose level to MTD based on the safety profile.

An all causality AE was any untoward medical occurrence in participant who received study drug without regard to possibility of causal relationship. Treatment-related AEs was any untoward medical occurrence in participant that was attributed to study drug. Treatment-emergent events were events between first dose of study drug and up to 28 days after last dose that were absent before treatment or that worsened relative to pretreatment state.

AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. AE was assessed according to severity; Grade 0 (no change from normal); grade 1 (mild AE which did not cause any significant problem, no dose adjustment required); grade 2 (moderate AE which caused problem that did not interfere significantly with usual activities or the clinical status, dose adjustment needed due to adverse event); grade 3 (severe AE which caused problem that interfered significantly with usual activities or the clinical status, study drug stopped due to adverse event); grade 4 (life threatening AE) and grade 5 (death). Treatment-emergent events were events between first dose of study drug and up to 28 days after last dose that were absent before treatment or that worsened relative to pretreatment state.

AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. Seriousness of an AE was assessed as serious adverse event (SAE) and non-serious adverse event (non-SAE). An SAE was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. Non-SAE included all AE minus SAE. Treatment-emergent events were events between first dose of study drug and up to 28 days after last dose that were absent before treatment or that worsened relative to pretreatment state.

Total time from onset of adverse event till the event is resolved. Treatment-emergent events were events between first dose of study drug and up to 28 days after last dose that were absent before treatment or that worsened relative to pretreatment state.

Laboratory tests included hematology (hemoglobin, lymphocytes absolute [abs], neutrophils abs, platelets, white blood cells) and chemistry (alanine aminotransferase, alkaline phosphatase, amylase, aspartate aminotransferase, bilirubin, creatinine, hypercalcemia, hyperglycemia, hyperkalemia, hypernatremia, hypoalbuminemia, hypocalcemia, hypokalemia, hyponatremia, hypophosphatemia, lipase). Assays were based on National Cancer Institute [NCI] Common Terminology Criteria for AE (CTCAE) grading scale for AEs (grade 1 [mild AE: did not cause any significant problem, no dose adjustment required]; grade 2 [moderate AE: caused problem that did not interfere significantly with usual activities or the clinical status, dose adjustment needed due to adverse event]; grade 3 [severe AE: caused problem that interfered significantly with usual activities or the clinical status, study drug stopped due to adverse event] and grade 4 [life threatening AE]). Overall data of the 4 grades is reported.

Percentage of participants with objective response based assessment of confirmed complete response (CR) or confirmed partial response (PR) according to Response Evaluation Criteria in Solid Tumors (RECIST). Confirmed responses are those that persist on repeat imaging study at least 4 weeks after initial documentation of response. CR defined as disappearance of all target lesions and non-target lesions. PR defined as >=30 % decrease in sum of the longest diameters (LD) of the target lesions taking as a reference the baseline sum LD according to RECIST associated to non-progressive disease response for non-target lesions.

Participants who achieved either a confirmed complete Response or confirmed partial response or a Stable disease lasting at least 12 weeks from the first dose was defined as achieving disease control. Confirmed responses are those that persist on repeat imaging study at least 4 weeks after initial documentation of response. CR: disappearance of all target lesions and non-target lesions. PR: >=30 % decrease in sum of the longest diameters (LD) of the target lesions taking as a reference the baseline sum LD and stable disease: neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for PD taking as a reference the smallest sum of the LD according to RECIST associated to non-progressive disease response for non-target lesions. Percentage of participants achieving disease control was calculated out of the participants participating in the exploratory phase.

Time in months from start of treatment to first documentation of objective tumor progression. TTP was calculated as (first event date or last known progression-free date minus the date of treatment plus 1) divided by 30.44. Tumor progression was determined from oncologic assessment data (where data meet the criteria for progressive disease [PD] per RECIST). PD: >=20% increase in the sum of the LD of the target lesions taking as a reference the smallest sum of the LD or the appearance of one or more new lesions and as unequivocal progression of existing non-target lesions, or the appearance of >=1 new lesions. TTP was calculated out of the participants participating in the exploratory phase.

Volume of distribution is defined as the theoretical volume in which the total amount of drug would need to be uniformly distributed to produce the desired blood concentration of a drug. As per planned analysis, volume of distribution was summarized if at least 3 participants had reportable value.

AUC (0-28) = Area under the plasma concentration versus time curve from time zero (pre-dose) to Day 28 (0-28).

Area under the plasma concentration time-curve from zero to the last measured concentration (AUClast).

CL is a quantitative measure of the rate at which a drug substance is removed from the body. As per planned analysis, CL was summarized if at least 3 participants had reportable value.

Plasma decay half-life is the time measured for the plasma concentration to decrease by one half. As per planned analysis, t1/2 was summarized if at least 3 participants had reportable value.

HAHA concentration was analyzed in blood samples for the evaluation of immunogenicity of PF-03446962. HAHA concentration was reported for samples above lower limit of quantification (>=4.32).

Plasma concentrations of soluble proteins (Ang-2, BMP-9, C-C motif) may be associated with tumor angiogenesis or tumor physiology and may correlate with efficacy or biological activity.

Plasma concentrations of soluble proteins (CD106, CD54 and Endoglin) may be associated with tumor angiogenesis or tumor physiology and may correlate with efficacy or biological activity.

Plasma concentrations of soluble proteins (PLGF, TGFB1, VEGF-A) may be associated with tumor angiogenesis or tumor physiology and may correlate with efficacy or biological activity.

Plasma concentrations of soluble proteins (VEGF-C, VEGF-d, VEGFR1) may be associated with tumor angiogenesis or tumor physiology and may correlate with efficacy or biological activity.

Plasma concentrations of soluble proteins (VEGFR2, VEGFR3) may be associated with tumor angiogenesis or tumor physiology and may correlate with efficacy or biological activity.

Circulating endothelial cells (CECs) are noninvasive marker of vascular damage, remodeling, and dysfunction. Blood samples for the assessment of CECs and circulating CEPs were collected to analyze effects of therapy on the number, viability/apoptotic state, and/or target activity/expression in CECs. Circulating Cells were classified as CEPs if cluster differentiation 133 positive cells (CD133+) were detected.