The goal of this clinical study is to learn if RSLV-132 improves the symptoms of SS in adults. It will also learn about the safety of RSLV-132. The main questions it aims to answer are:
* Does RSLV-132 improve the cardinal symptoms of Sjogren's including fatigue, dryness and pain?
* Does RSLV-132 improve the tiredness/fatigue caused by Sjogren's?
* What are the blood levels of RSLV-132 over time?
* What is the immune (antibody) response in the body to RSLV-132?
* What is the safety profile of RSLV-132?
Researchers will compare RSLV-132 to a placebo (a look-alike substance that contains no drug) to see if RSLV-132 improves the symptoms of pSS.
Participants will:
Take RSLV-132 or a placebo 13 times over 22 weeks Visit the clinic once every week for the first 2 weeks, then every 2 weeks until the end of treatment and then for a final time 4 weeks later (Day 211) for check-ups, tests and to answer questionnaires about their symptoms Record their symptoms every day on an electronic device