RNP is an antibody that is most associated with mixed connective tissue disease which is an overlapping connective tissue disease. The classic definition is that you can have symptoms of lupus, scleroderma, and polymyositis but each case is different in presentation and progress. It could also include symptoms of other autoimmune diseases.
I have mctd and had symptoms of lupus and polymyositis but have been in remission for almost 8 years. You need to find a rheumatologist or neurologist who is experienced treating autoimmune diseases. It is almost always treatable but everyone reacts to meds differently so having an experienced doc is very important.
FYI, people get confused about lupus and overlap diseases. Lupus is a connective tissue disease and mctd is a syndrome that can include lupus symptoms as well as symptoms from other diseases. In effect, you have lupus and possibly other diseases all wrapped into one. Treatment is pretty much the same and governed by your symptoms and their severity.
MCTD (SLE Lupus, polymyositis, scleroderma). Diagnosed 2005. Kidney, liver, GI tract, dysphagia, raynauds, barretts esophagus, quadriplegic in 2005. Recovered and now active in downhill skiing, golf, hiking. Meds: amlodipine, benezapril, omeprazole, potassium, folic acid, vitamins, maxide.
Remain Optimistic and you can overcome.