Table 3. Summarized data assessing the relationship between CK18 and clinicopathological features.

Categories	OR (95%CI)	P value	I2 (%)
Age (≥50/<50)	1.90 (1.03–3.51)	<0.0001	91
ER (Positive/Negative)	1.13 (0.93–1.36)	0.22	0
PR (Positive/Negative)	1.27 (1.07–1.52)	0.008	21
HER (Positive/Negative)	1.29 (1.01–1.64)	0.04	39
Tumor size (≥2 cm/<2 cm)	1.37 (1.19–1.58)	<0.0001	63
Tumor stage (T3,T4/T1,T2)	2.83 (1.32–6.06)	0.007	95
Nodal status (Positive/Negative)	2.11 (1.28–3.46)	0.003	87
Tumor grade (grade 3/grade 1,2)	1.82 (1.46–2.27)	<0.00001	76

Abbreviations: ER, estrogen hormone receptors; HER, epidermal growth factor receptor; PR, progesterone receptor.