Dieckmann et al. (2019) reported that microRNA-371a-3p could act as a new diagnostic biomarker for testicular germ cell tumors because it had a sensitivity and specificity of over 90%, which outperformed the classic markers such as alpha-fetoprotein, beta-human chorionic gonadotropin, and lactate dehydrogenase. Lin et al. (2015) conducted a similar study on hepatocellular carcinoma and identified a miRNA classifier containing seven miRNAs (miR-29a, miR-29c, miR-133a, miR-143, miR-145, miR-192, and miR-505). Here, AFP is linked to hepatocellular carcinoma.