In addition, the tumor sizes and areas were comparable between KP and KP7 mice at 6 weeks after induction, whereas the tumor sizes and areas were significantly larger in the lungs of KP7 mice than in those of KP mice at 8 or 10 weeks after induction (Fig. 2e, f), indicating that CCL7 deficiency does not affect the initiation of NSCLC tumors at early stage but inhibits tumor progression at late stage. Here, CCL7 is linked to neoplasm.