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Cox regression analysis for progression-free survival after treatment with gemcitabine and cisplatin
HR=hazard ratio; CI=confidential interval; ECOG=Eastern Cooperative Oncology Group; PS=performance status; ER=estrogen receptor; PR=progesterone receptor; HER2=human epidermal growth factor receptor 2; DDFI=distant disease-free interval; TTGP=time interval from the diagnosis of metastasis to gemcitabine and cisplatin therapy.
