Part I: SAD of OSCN- and bLF in healthy male volunteers (cohorts 1 to 3) - Part II: SAD and MAD of ALX-009 in healthy male volunteers (cohorts 4 and 5) - Part III: MAD of OSCN- and bLF in patients suffering from cystic fibrosis (cohorts 6 to 8) - Part IV: MAD of ALX-009 in patients suffering from cystic fibrosis (cohorts 9 to 11)