There was a minimum 7-day washout period between treatments for each subject within a cohort and at least 3 days for each dose increment between cohorts. Part 2 (n

= 18 subjects): Multiple dose intakes (20 mg and 50 mg once daily) of GLPG0259 or a matching placebo over 5 days were studied in two cohorts of nine subjects (active or placebo in a 2 : 1 ratio). There was a minimum period of 7 days between the two cohorts. Treatment allocation was determined by a computer-generated randomization schedule. Subjects were admitted to the clinical unit on the selleck evening prior to dosing (day -1) and were confined until 24 hours after the last selleckchem dose. In both parts, GLPG0259 free-base solution (1–10 mg/mL in 40% [w/v] hydroxypropyl-ß–cyclodextrin, pH 3) or a matching placebo was given using a graduated syringe. A volume of 200 mL of water was given to each subject immediately at the time of dosing. Treatments were

administered after a standard breakfast (i.e. four slices of whole-wheat bread, one slice of salami, one slice of cheddar cheese, one tablespoon of butter and jam, totaling 590 kilocalories) except during the last dosing period of part 1, where the treatment was administered after an overnight fast to assess the food effect on GLPG0259 bioavailability. Drinks were standardized to at least 1000 mL of mineral water per day. Blood samples for pharmacokinetics were collected at regular intervals over 24 hours (part 1: 1.5–15 mg; part 2: 20 mg and 50 mg on day 1), 4 days (part 1: 30–150 mg), or 7 days postdose (part 2: 20 mg and 50 mg on day 5). Blood cAMP learn more was collected in tubes containing lithium heparinate as an anticoagulant in order to obtain plasma for analysis of the concentrations of GLPG0259. Within 30 minutes after blood collection, the plasma was separated in a refrigerated centrifuge (4–8°C) for 10 minutes at approximately 1500 g, transferred into two polypropylene tubes with at least 500 μL of plasma per tube, and stored at -20°C until analysis. Three urine fractions were collected in part 2 on days 1 and 5 over a 24-hour period to determine the amount of GLPG0259 excreted in urine. After homogenization and recording of the total weight, two 10 mL samples for the GLPG0259

assay were stored at or below -20°C until analysis. Study 2: Multiple Ascending Oral Doses and Methotrexate Drug-Drug Interaction This was a phase I, randomized, double-blind, placebo-controlled, single-center study to evaluate the safety, tolerability, and pharmacokinetics of oral multiple ascending doses of GLPG0259 given for 14 days to healthy subjects (n = 24), and to get preliminary information on the potential pharmacokinetic interaction between GLPG0259 and methotrexate. The criteria for subject eligibility were the same as those listed for study 1. A total of 24 healthy male subjects were randomized into three cohorts of eight subjects dosed orally once daily with either placebo or GLPG0259 25 mg, 50 mg, or 75 mg (active or placebo in a 3 : 1 ratio).