PDIA4 and ovarian carcinoma: Further investigation focused on finding out the downstream signaling pathway of miR‐378a‐3p and PDIA4 in ovarian cancer, we found that miR‐378a‐3p mimic and pcDNA3.1‐PDIA4 had no effect on AKT and PI3K levels, while miR‐378a‐3p mimic enhanced the expression levels of p‐AKT and p‐PI3K, and pcDNA3.1‐PDIA4 suppressed the expression levels of p‐AKT and p‐PI3K.