Efficacy, Safety, Tolerability and Pharmacokinetics (PK) of Nilotinib (AMN107) in Pulmonary Arterial Hypertension (PAH)

Inclusion Criteria: * World Health Organization (WHO) Functional Class II or III * 6MWD ≥ 150 m and ≤ 450 m at screening * Current diagnosis of PAH according to Dana Point 2008 Meeting * Inadequate clinical response on one or more class(es) of PAH drug * Stabilization of pulmonary hypertension medications for ≥ 2 months on approved therapeutic dose of at least one PAH drug and still symptomatic with WHO functional Class II or III performance. Exclusion Criteria: * Women of child-bearing potential not practicing birth control * In treatment with chronic nitric oxide therapy * Pre-existing lung disease * Use of drugs prolonging the QT interval or strong CYP3A4 inhibitors * Long QT syndrome or QTc \> 450 ms males; \> 470 ms females. * WHO Class IV * Pulmonary capillary wedge pressure \> 15 mm Hg * Other diagnosis of PAH in WHO Diagnostic Group 1 * PAH associated with: venous hypertension (WHO Diagnostic Group II), hypoxia (WHO Diagnostic Group III), chronic pulmonary thromboembolic disease (WHO Diagnostic Group IV) or other miscellaneous causes (WHO Diagnostic Class V, which includes sarcoidosis, histiocytosis X, lymphangiomatosis, compression of pulmonary vessels) * Thrombocytopenia \< 50 x109/L (50 x 103/µL) * Uncontrolled systemic arterial hypertension, systolic \> 160 mm Hg or diastolic \>90 mm Hg * Any advanced, severe, or unstable disease of any type that may interfere with the primary and secondary endpoint evaluations. Other protocol-defined inclusion/exclusion criteria may apply