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The effect of camrelizumab monoclonal antibody combined with chemotherapy on serum CY211，MMP⁃9 expressions and tumor growth and metastasis in elderly patients with non⁃small cell lung cancer
WU Kelin, WU Tianying, XU Hai
The Journal of Practical Medicine . 2020, (
20
): 2830 -2833 . DOI: 10.3969/j.issn.1006⁃5725.2020.20.017
