HOXA13 and cancer: The gene expressions and functions of HOXA5 (Ordóñez-Morán et al., 2015; Zhang et al., 2017; Peng et al., 2018), HOXA6 (Wu et al., 2018, 2019), HOXA7 (Tang et al., 2016), HOXA9 (Fu et al., 2017; de Bock et al., 2018), HOXA10 (Chen et al., 2019; Hatanaka et al., 2019), and HOXA11 (Zhang R. et al., 2018) are also controversial across cancers, except for HOXA13 (He et al., 2017).