Regimen II (high-dose of RO4929097): Patients receive high-dose RO4929097 PO once daily on days 1-3, 8-10, and 15-17 and midazolam hydrochloride IV, oral omeprazole, oral tolbutamide, and oral dextromethorphan hydrobromide on days 1 and 10. After completion of course 1, patients are randomized to 1 of 2 treatment arms.