MicroRNA (miRNA) segmentation by application reveals a landscape where oncology commands the largest revenue share, exceeding 45 % in 2023, because circulating miRNA signatures are now embedded in pivotal companion-diagnostic algorithms for non-small-cell lung and colorectal cancers. The neurobiology segment, though currently <15 % of the market, is expanding fastest as multiplex qPCR panels for exosomal miR-124, miR-132 and miR-29 families enter late-stage trials for Alzheimer’s minimal-residual detection, creating a differentiated revenue stream compared with saturated onco-diagnostics. Cardiovascular applications contribute roughly 18 %; here, the utility lies not in standalone tests but in risk-stratifying acute-coronary-syndrome patients when combined with high-sensitivity troponin, a positioning that secures recurring high-volume contracts from large hospital chains. Liver-fibrosis and diabetes niches together account for ~12 %, yet their value is amplified by public-health initiatives in Asia-Pacific where non-invasive miRNA-based scores are reimbursed to curb biopsy costs, illustrating how geographic policy shapes segment attractiveness.