A Randomized, Double-blind, Parallel Group, Placebo-controlled Multicenter Study to Evaluate Efficacy, Safety and Tolerability of Ianalumab in Participants With Diffuse Cutaneous Systemic Sclerosis

The study consists of the following periods: * Screening Period, with a duration of up to 6 weeks; * Treatment Period 1, with a duration of 52 weeks; * Treatment Period 2 (Open-label treatment), with a duration of 52 weeks; * Post-treatment Follow-up Period, with a duration of at least 20 weeks post last dose and up to 2 years.