If you decide to take part in this serial PK procedure of the study and you are randomized to receive alectinib, additional blood samples will be collected at the Baseline visit, (first day of study medication), and again 4 weeks later. Blood samples will be collected at different times throughout the day. A sample will be collected within 2 hours before you have your study medication and then at 1, 2, 4, 6, and 8 hours after the dose. You will be required to stay at the site for approximately 10 hours. At each time point 2 ml (approximately half a teaspoon) of blood will be collected.