We tested the expression of CIP2A at protein level in nonmalignant and malignant cells, and found that CIP2A was highly expressed in lung cancer cell lines (A549, H1975, 95D and L78) compared to normal human embryonic lung fibroblasts (HLF and MRC5) and normal human bronchial epithelial cells (HBEpiC) (Figure 1A). Here, CIP2A is linked to lung cancer.