A Dose Finding Study Of A New Medication, PF-00337210 That Will Possibly Decrease Blood Supply To Tumors

DLTs included events occurring in Cycle 1: blood pressure of 180/110 millimeters of mercury (mmHg) or higher for 3 readings over 3 hours regardless of use of anti-hypertensive drugs or greater than (>) 160/100 mmHg for 3 readings over 3 days on maximum anti-hypertensive drugs; afebrile Grade 4 neutropenia for greater than or equal to (>=) 7 days or >=Grade 3 neutropenia associated with fever (1 reading of oral temperature >38.5 degree Celsius [degree C] or 3 readings of oral temperature >38.0 degree C in 24-hour period); Grade 4 thrombocytopenia; hemoptysis of >1/2 teaspoon of bright red blood per day; proteinuria of >=2 grams/24 hours; inability to resume PF-00337210 dosing at current dose level within 14 days of stopping due to treatment-related toxicity; >=Grade 3 nonhematological toxicities (except alopecia and blood pressure/hypertension); Grade 3 nonhematological toxicities that could be controlled to Grade 2 or less with appropriate treatment were not considered dose limiting.

MTD: dose level at which no more than 1 of 6 participants experienced DLT during Cycle 1. DLTs: blood pressure of 180/110 mmHg or higher for 3 readings over 3 hours regardless of use of anti-hypertensive drugs or >160/100 mmHg for 3 readings over 3 days on maximum anti-hypertensive drugs; afebrile Grade 4 neutropenia >=7 days or >= Grade 3 neutropenia associated with fever (1 reading of oral temperature >38.5 degree C or 3 readings of oral temperature >38.0 degree C in 24-hour period); Grade 4 thrombocytopenia; hemoptysis of >1/2 teaspoon of bright red blood per day; proteinuria of >=2 grams/24 hours; inability to resume PF-00337210 dosing at current dose level within 14 days of stopping due to treatment-related toxicity; >=Grade 3 nonhematological toxicities (except alopecia and blood pressure/hypertension); Grade 3 nonhematological toxicities that could be controlled to Grade 2 or less with appropriate treatment were not considered dose limiting.

MAD: dose level at which 2 or more out of 6 participants experienced DLT during Cycle 1. DLTs: blood pressure of 180/110 mmHg or higher for 3 readings over 3 hours regardless of use of anti-hypertensive drugs or >160/100 mmHg for 3 readings over 3 days on maximum anti-hypertensive drugs; afebrile Grade 4 neutropenia >=7 days or >= Grade 3 neutropenia associated with fever (1 reading of oral temperature >38.5 degree C or 3 readings of oral temperature >38.0 degree C in 24-hour period); Grade 4 thrombocytopenia; hemoptysis of >1/2 teaspoon of bright red blood per day; proteinuria of >=2 grams/24 hours; inability to resume PF-00337210 dosing at current dose level within 14 days of stopping due to treatment-related toxicity; >=Grade 3 nonhematological toxicities (except alopecia and blood pressure/hypertension); Grade 3 nonhematological toxicities that could be controlled to Grade 2 or less with appropriate treatment were not considered dose limiting.

RP2D was determined based on the safety profile and pharmacodynamic findings. The twice daily dosing was preferred over once daily dosing for RP2D, as per investigator's discretion, due to more consistent changes in pharmacodynamic markers and greater clinical benefit observed in twice daily dosing.

Plasma decay half-life is the time measured for the plasma concentration to decrease by one half.

AUC (0-24)= Area under the plasma concentration versus time curve from time zero (pre-dose) to time of last quantifiable concentration (0-24).

AUC (0 - ∞)= Area under the plasma concentration versus time curve (AUC) from time zero (pre-dose) to extrapolated infinite time (0 - ∞). It is obtained from AUC (0 - t) plus AUC (t - ∞).

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 plasma concentration of a drug. Apparent volume of distribution after oral dose is influenced by the fraction absorbed.

CL is a quantitative measure of the rate at which a drug substance is removed from the body.

Number of participants with objective response based on assessment of confirmed complete response (CR) or confirmed partial response (PR) according to Response Evaluation Criteria in Solid Tumors (RECIST). Confirmed CR defined as disappearance of all target and non-target lesions and no appearance of new lesions. Confirmed PR defined as at least 30 percent decrease in sum of the longest dimensions (LD) of the target lesions, taking as a reference the baseline sum LD, without progression of non-target lesions and no appearance of new lesions. Confirmed responses are those that persist on repeat imaging study >=4 weeks after initial documentation of response.

Biomarkers included soluble plasma proteins associated with angiogenesis (vascular endothelial growth factor [VEGF], soluble vascular endothelial growth factor-2 receptor [sVEGFR2], soluble vascular endothelial growth factor-3 receptor [sVEGFR3], soluble beta type platelet-derived growth factor [sPDGFR beta]) and tumor proliferation (soluble stem-cell factor receptor [sKIT])

AUC (0-24)= Area under the plasma concentration versus time curve from time zero (pre-dose) to time of last quantifiable concentration (0-24).