HOXA5 and ovarian serous adenocarcinoma: A recent functional study has suggested that GAS5 functions as a ceRNA for miR-196a-5p to upregulate homeobox A5 (HOXA5), promoting apoptosis of primary tumor cells from high-grade serous ovarian cancer tissues as well as A2780 and OVCAR3 cells (Zhao et al., 2018; Figure 1C).