@margar1, Here is some information on the topic...

"Sjögren's syndrome is an inflammatory condition resulting from an abnormal immune system response. Along with causing symptoms such as dry eyes, dry mouth and joint pain, it can increase the risk of non-Hodgkin's lymphoma (NHL), a cancer of white blood cells called lymphocytes."
-- Non-Hodgkin's Lymphoma with Sjögren's Syndrome
https://www.arthritis.org/health-wellness/about-arthritis/related-conditions/other-diseases/non-hodgkins-lymphoma-with-sjogrens-syndrome