Undifferentiated Connective Tissue Disease: Comprehensive Review.

UCTD can be subcategorized as evolving (eUCTD) or stable UCTD (sUCTD) based on its evolution towards a definable autoimmune syndrome. Analyzing the data from six UCTD cohorts published in the literature, we found that 28% of patients have an evolving course with the majority developing SLE or rheumatoid arthritis within 5-6 years of the UCTD diagnosis. From the remaining patients, 18% do achieve remission. Published treatment regimens were similar to other mild autoimmune diseases with low-dose prednisone, hydroxychloroquine, and NSAID. One-third of patients did need immune suppressive medications. Importantly, the reported outcomes were excellent with survival rates of more than 90% over 10 years. It has to be noted though that as data on patient related outcomes are not available to date, the exact impact of this condition on quality of life is unclear. UCTD is a mild autoimmune condition with generally good outcomes. There is still great uncertainty though regarding diagnosis and management. Going forward, consistent classification criteria are needed to advance UCTD research and eventually provide authoritative guidance on the management of the condition.