Can chronic diseases like diabetes or autoimmune conditions affect miRNA results?

Certain chronic conditions are associated with altered miRNA expression. Type 2 diabetes has been associated with changes in circulating miRNAs including miR-21 (related to insulin resistance signaling). Autoimmune conditions (rheumatoid arthritis, lupus, inflammatory bowel disease) involve chronic inflammation that can affect miR-21 levels. However, the Yenos validation studies enrolled cancer patients diagnosed at Stage I/II and healthy controls — the healthy controls represent a real-world population that includes individuals with common chronic conditions. The zero data overlap result (no healthy sample above 1.5× HL, no cancer sample below it) was achieved in this realistic population. If you have a significant chronic inflammatory or metabolic condition, discuss this with your physician when interpreting your results — elevated results in this context warrant careful clinical correlation.