The primary objective of Part 1 of this study is to evaluate the safety and tolerability of the intravenous (IV) dose of GDC-0973. The primary objectives of Part 2 of this study are to evaluate the absolute bioavailability of GDC-0973 and to evaluate the pharmacokinetic (PK) of GDC-0973 following IV and oral administration. The secondary objective of Part 2 of this study is to evaluate the safety of GDC-0973 administered orally and intravenously.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
NONE
Enrollment
13
IV infusion.
Oral dose.
Maximum Observed Plasma Concentration (Cmax) of IV and Oral GDC-0973
Time frame: Part 2: 0 hours (Hrs) (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 144, and 192 Hrs post-dose on Day 1
Dose Normalized Cmax [Cmax(dn)] of IV and Oral GDC-0973
Cmax(dn) is Cmax divided by dose.
Time frame: Part 2: 0 Hrs (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 144, and 192 Hrs post-dose on Day 1
Minimum Observed Plasma Trough Concentration (Cmin) of IV and Oral GDC-0973
Time frame: Part 2: 0 Hrs (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 144, and 192 Hrs post-dose on Day 1
Time to Reach Maximum Observed Plasma Concentration (Tmax) of IV and Oral GDC-0973
Time frame: Part 2: 0 Hrs (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 144, and 192 Hrs post-dose on Day 1
Area Under the Curve From Time Zero to Last Quantifiable Concentration [AUC (0-t)] of IV and Oral GDC-0973
AUC (0-t)= Area under the plasma concentration versus time curve from time zero (pre-dose) to time of last quantifiable concentration (0-t).
Time frame: Part 2: 0 Hrs (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 144, and 192 Hrs post-dose on Day 1
Dose Normalized AUC (0-t) [AUC (0-t)dn] of IV and Oral GDC-0973
AUC (0-t)= Area under the plasma concentration versus time curve from time zero (pre-dose) to time of last quantifiable concentration (0-t). AUC (0-t)dn is AUC (0-t) divided by dose.
Time frame: Part 2: 0 Hrs (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 144, and 192 Hrs post-dose on Day 1
Area Under the Curve From Time Zero to Extrapolated Infinite Time [AUC (0 - ∞)] of IV and Oral GDC-0973
AUC (0 - ∞)= Area under the plasma concentration versus time curve from time zero (pre-dose) to extrapolated infinite time (0 - ∞). It is obtained from AUC (0 - t) plus AUC (t - ∞).
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Time frame: Part 2: 0 Hrs (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 144, and 192 Hrs post-dose on Day 1
Dose Normalized AUC (0 - ∞) [AUC (0 - ∞)dn] of IV and Oral GDC-0973
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 - ∞). AUC (0 - ∞)dn is AUC(0 - ∞) divided by dose.
Time frame: Part 2: 0 Hrs (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 144, and 192 Hrs post-dose on Day 1
Plasma Decay Half-Life (t1/2) of IV and Oral GDC-0973
t1/2 is the time measured for the plasma concentration of GDC-0973 to decrease by one half.
Time frame: Part 2: 0 Hrs (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 144, and 192 Hrs post-dose on Day 1
Systemic Clearance (CL) of IV GDC-0973
CL is a quantitative measure of the rate at which a drug substance is removed from the body.
Time frame: Part 2: 0 Hrs (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 144, and 192 Hrs post-dose on Day 1
Apparent Oral Clearance (CL/F) of Oral GDC-0973
Clearance of a drug is a measure of the rate at which a drug is metabolized or eliminated by normal biological processes. Clearance obtained after oral dose (apparent oral clearance) is influenced by the fraction of the dose absorbed. Clearance was estimated from population PK modelling. Drug clearance is a quantitative measure of the rate at which a drug substance is removed from the blood.
Time frame: Part 2: 0 Hrs (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 144, and 192 Hrs post-dose on Day 1
Volume of Distribution at Steady State (Vss) of IV GDC-0973
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. Vss is the apparent volume of distribution at steady-state.
Time frame: Part 2: 0 Hrs (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 144, and 192 Hrs post-dose of Day 1
Apparent Volume of Distribution (Vz/F) of Oral GDC-0973
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. Vz/F is influenced by the fraction absorbed.
Time frame: Part 2: 0 Hrs (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 144, and 192 Hrs post-dose on Day 1
Absolute Oral Bioavailability (F) of GDC-0973
Absolute oral bioavailability is the amount of drug from a formulation that reaches the systemic circulation relative to an IV dose. F = \[AUC (0-∞), oral multiplied by Dose IV\] divided by \[AUC (0-∞), IV multiplied by Dose oral\]. Absolute oral bioavailability is determined for drugs which are administered orally. IV dose is 100% in systemic circulation (dosed directly) and hence no estimation is required.
Time frame: Part 2: 0 Hrs (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 144, and 192 Hrs post-dose on Day 1
Mean Absorption Time (MAT)
MAT is mean time required for the drug to reach the central compartment. MAT was estimated from the mean resident time (MRT) from oral and IV administration. MAT was calculated as MRT last of oral dose minus MRT last of IV dose. MAT is analyzed when drug is administered orally (only for non-IV routes of administration).
Time frame: Part 2: 0 Hrs (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 144, and 192 Hrs post-dose on Day 1
Amount of Drug Excreted in the Urine (Aeu) of IV and Oral GDC-0973
The cumulative amount of drug excreted in urine over the entire collection interval of 96 hrs was calculated by adding the Aeu of the intervals 0 to 12, 12 to 24, 24 to 48, 48 to 72, and 72 to 96 hrs where Aeu was calculated by multiplying the urine volume within the collection interval by the associated drug concentration.
Time frame: Part 2: 0 to 12, 12 to 24, 24 to 48, 48 to 72, and 72 to 96 Hrs post-dose on Day 1
Renal Clearance (CLR) of IV and Oral GDC-0973
CLR was calculated as Aeu divided by AUC (0 - ∞), where Aeu was amount of drug excreted in urine from time 0 to 96 hrs post-dose and AUC(0 - ∞) was area under the concentration-time curve of the analyte in plasma over the time interval from zero extrapolated to infinity hrs post-dose.
Time frame: Part 2: 0 Hrs (pre-dose), 0.5, 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 144, and 192 Hrs post-dose on Day 1 for plasma; 0 to 12, 12 to 24, 24 to 48, 48 to 72, and 72 to 96 Hrs post-dose for urine
Percent of GDC-0973 Excreted in the Urine (% Excreted) for IV and Oral GDC-0973
% Excreted is the mean percentage of dose recovery in urine and calculated as: (Aeu divided by dose) multiplied by 100, where Aeu was amount of drug excreted in urine from time 0 to 96 hrs post-dose.
Time frame: Part 2: 0 to 12, 12 to 24, 24 to 48, 48 to 72, and 72 to 96 Hrs post-dose