In most cell lines derived from different subtypes of breast cancer or other cancers, DBC1 protein was degraded under hypoxia, suggesting the reduced stability of DBC1 was a general rule in hypoxic conditions (Figure 1F and Supplementary file 1), while the mRNA level of CCAR2 was not changed under hypoxia (Figure 1G and Supplementary file 1). This evidence concerns the gene CCAR2 and cancer.