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). This evidence concerns the gene HOXA9 and cancer.