An Absolute Bioavailability Study in Healthy Participants Comparing Oral to Intravenous Administration of GDC-0973 (Cobimetinib)

Study Overview
=================
Brief Summary
-----------------
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.

Official Title
-----------------
A Phase 1, Single Dose, Randomized, Cross-over Absolute Bioavailability Study in Healthy Subjects Comparing Oral to Intravenous Administration of GDC-0973

Conditions
-----------------
Healthy Volunteers

Intervention / Treatment
-----------------
* Drug: GDC-0973 IV Infusion
* Drug: GDC-0973 Oral Capsules


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria Within body mass index range 18.5 to 29.9 kilograms per square meter (kg/m^2) In good health, determined by no clinically significant findings from medical history, 12-lead electrocardiogram (ECG), and vital signs Clinical laboratory evaluations within the reference range for the test laboratory Negative test for selected drugs of abuse at Screening and at each Check-in Negative hepatitis panel and anti-hepatitis C virus and negative human immunodeficiency virus (HIV) antibody screens Healthy males and females of non-child-bearing potential or who agree to use effective contraception Exclusion Criteria Significant history or clinical manifestation of any significant metabolic, allergic, dermatological, hepatic, renal, hematological, pulmonary, cardiovascular, gastrointestinal, neurological, or psychiatric disorder History of significant hypersensitivity, intolerance, or allergy to any drug compound, food, or other substance History of stomach or intestinal surgery or resection that would potentially alter absorption and/or excretion of orally administered drugs except that appendectomy, hernia repair, and cholecystectomy will be allowed History or presence of an abnormal ECG History of alcoholism or drug addiction prior to period 1 check-in Use of any tobacco-containing or nicotine-containing products prior to period 1 check-in Participation in any other investigational study drug trial in which receipt of an investigational study drug occurred within 28 days or 5 half-lives, whichever is longer, prior to period 1 check-in Use of any prescription medications/products, including proton pump inhibitors, within 14 days prior to period 1 check-in Poor peripheral venous access Any acute or chronic condition that would limit the participants ability to complete and/or participate in this clinical study Female participant is pregnant, lactating, or breastfeeding Predisposing factors to retinal vein occlusion (RVO)

Ages Eligible for Study
-----------------
Minimum Age: 18 Years
Maximum Age: 55 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
Accepts Healthy Volunteers

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Basic Science
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Part 1: GDC-0973 IV Infusion First, Then GDC-0973 Capsules<br>Participants will receive single dose of GDC-0973 2 milligrams (mg) IV infusion in first intervention period followed by single dose of GDC-0973 20 mg oral capsules (four 5-mg capsules) in second intervention period. The washout period between each period will be a minimum of 10 days. | Drug: GDC-0973 IV Infusion<br>* IV infusion.<br>* Other names: XL518;Drug: GDC-0973 Oral Capsules<br>* Oral dose.<br>* Other names: XL518;|
| Experimental: Part 2: GDC-0973 IV Infusion First, Then GDC-0973 Capsules<br>Participants will receive single dose of GDC-0973 2 mg IV infusion in first intervention period followed by single dose of GDC-0973 20 mg oral capsules (four 5-mg capsules) in second intervention period. The washout period between each period will be a minimum of 10 days. | Drug: GDC-0973 IV Infusion<br>* IV infusion.<br>* Other names: XL518;Drug: GDC-0973 Oral Capsules<br>* Oral dose.<br>* Other names: XL518;|
| Experimental: Part 2: GDC-0973 Capsules First, Then GDC-0973 IV Infusion<br>Participants will receive single dose of GDC-0973 20 mg oral capsules (four 5-mg capsules) in first intervention period followed by single dose of GDC-0973 2 mg IV infusion in second intervention period. The washout period between each period will be a minimum of 10 days. | Drug: GDC-0973 IV Infusion<br>* IV infusion.<br>* Other names: XL518;Drug: GDC-0973 Oral Capsules<br>* Oral dose.<br>* Other names: XL518;|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Maximum Observed Plasma Concentration (Cmax) of IV and Oral GDC-0973 |  | 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. | 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 |  | 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 |  | 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). | 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. | 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 - ∞). | 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. | 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. | 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. | 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. | 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. | 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. | 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. | 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). | 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. | 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. | 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. | Part 2: 0 to 12, 12 to 24, 24 to 48, 48 to 72, and 72 to 96 Hrs post-dose |