This study is for people with Sjogren's syndrome, a condition causing dry eyes and mouth. It looks at the long-term safety and effectiveness of a medicine called ianalumab. If you've already been in a NEPTUNUS study, you can join this extension study. This study lasts up to 5 years with treatment for 3 years. You'll get ianalumab injections either every month or every 3 months. If you get it every 3 months, you'll receive a placebo in between to keep it secret which treatment you're on. About 600 people will join this study. You’ll need to visit the study site monthly for check-ups. There are rules about who can join, like having completed a previous NEPTUNUS study and not using certain other medicines.

• Duration: 3 years of treatment, up to 5 years total with follow-up.
• Visit frequency: Monthly during treatment and follow-ups.
• Participants: Around 600, continuing from NEPTUNUS studies.