“…MicroRNAs (miRNAs) have recently demonstrated promise in the diagnosis of other types of cancer ( Poel et al, 2018 , Montazerian et al, 2018 , Otandault et al, 2019 ) owing to their stability and relative ease of detection in blood samples, allowing minimally invasive, repeated sampling. Importantly miRNAs are aberrantly expressed in a number of cancers ( Pendlebury et al, 2017 , Deb et al, 2018 , Parizadeh et al, 2019 ), including HGSC ( Liu et al, 2019 ), where they have been shown to accelerate tumor migration and invasion ( Liu et al, 2019 ). However reduced expression of miRNAs can have the opposite effect, miR182 was associated with higher expression of discoidin domain receptor 2 (DDR2), a tumour promoter, in women with HGSC ( Ramalho et al, 2019 ) and lower circulating levels of miR182 had a worse prognosis ( Ramalho et al, 2019 ) suggesting that miRNAs both positively and negatively regulate tumour growth and disease progression.…”