According to Wu et al, miR‐19a/b was overexpressed in gastric cancer tissues and could promote metastasis by regulating tumor suppressor MXD1.46 However, according to another study, miR‐19‐3p showed to be a tumor suppressor in breast cancer by inhibiting cancer cell proliferation and changing saracatinib resistance status via targeting PI3K/Akt pathway.47 It indicates the duplicity of miR‐19b‐3p in cancers.48 Circulating miR‐19b‐3p has also been found to be reliable biomarker for various diseases. The gene discussed is AKT1; the disease is breast cancer.