ROR1 and breast cancer: The aberrantly expressed ROR1 has been extensively suggested to play a pivotal role in the process of different varieties of cancers or malignant cells, including gastric cancer (Ikeda et al., 2020), breast cancer (Fultang et al., 2020; Stuber et al., 2020), ovarian carcinoma (Wu et al., 2019), and pancreatic cancer (Xu et al., 2018).