Overall survival is associated with miR-210 expression and tumour node metastasis (TNM) tumour stage. (a) Kaplan-Meier plot shows the overall survival of renal cancer patients stratified by high and low miR-210 expression levels. High expression is defined as above the maximum normal tissue expression value (P = 0.189; log rank). (b) Kaplan-Meier plot showing the overall survival of renal cancer patients stratified by low (Stages 1 and 2) and high (Stages 3 and 4) TNM stage cc RCC tumours (P = 0.022; log rank). The black line indicates low miR-210 expression or tumour stage, and the grey line indicates high miR-210 expression or tumour stage.