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Table 1 Basic characteristics of included studies

From: Elevated PD-L1 expression predicts poor survival outcomes in patients with cervical cancer

Author Year Country No. of patients Age (year) Treatment FIGO stage Detection method Study period Survival analysis NOS score
Karim 2009 USA 115 46.5 (24–87) Surgery I–II IHC 1985–1999 OS 7
Duan 2017 China 64 47.5 (30–65) Surgery I–IIA IHC 2013–2015 OS 6
Enwere 2017 Canada 120 44 (39–49) CCRT IB–IVA IHC 1999–2008 OS, PFS 7
Kim 2017 Korea 27 46 (34–71) Surgery IB1–IIA IHC 2011–2012 OS, PFS 8
Feng 2018 China 219 49 (26–75) Mixed I–IV IHC 2013–2016 OS 7
Kawachi 2018 Japan 148 45 (30–72) Surgery I–II IHC 2001–2014 OS 7
Wang 2018 China 90 46 (23–71) Surgery IB1–IIA2 IHC 2009–2012 OS, PFS 7
  1. CCRT, concurrent chemo-radiotherapy; IHC, immunohistochemistry; OS, overall survival; PFS, progression-free survival; NOS, Newcastle–Ottawa scale