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Table 2 Clinicopathologic parameters of the studies included in this meta-analysis

From: Clinicopathological and prognostic significance of programmed death ligand-1 expression in breast cancer: a meta-analysis

Study Race Age Tumor size (2 cm ≤) Tumor size (>2 cm) HG1 HG2 HG3 LN (−) LN (+) ER (+) ER (−) PR (+) PR (−) HER-2 (+) HER-2 (−) KI-67 ≤ 14 KI-67 > 14
Qin T (2015) Eastern Asian median 47 (21-84) 282 57 37 338 495 427 443 630 240 617 253 18 852 123 440
Baptista M (2016) N/A N/A 57 132 33a 136 62 127 94 83 89 88 25 150 N/A N/A
Ali HR (2015) N/A N/A 2739 2741 896 2270 2101 2823 2527 3086 1298 N/A N/A 672 3805 N/A N/A
Muenst S (2014) N/A median 64 (27-101) 181 469 143 259 248 355 294 457 191 N/A N/A 129 519 118 525
Park IH (2016) N/A median 47 (28-78) 191 125 N/A N/A N/A 199 117 HRb (+) 176 HRb (−) 140 HRb (+) 176 HRb (−) 140 102 209 155 157
  1. HG histologic grade, LN lymph node metastasis, N/A not applicable, HR hormonal receptor
  2. aThe histologic grade was classified as 1/2 and 3 in the study
  3. bHormonal receptor (+) was defined as ER (+) or PR (+) and hormonal receptor (−) was defined as ER (−) and PR (−) in the study
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