Table 3 Relationship between expression level of neutrophil gelatinase‐associated lipocalin and proliferating cell nuclear antigen in oesophageal squamous cell carcinoma by western blot.

Group	PCNA expression level (T/N ratio, mean (SD))	p Value
NGAL		0.400
>0.55 ng	8.27 (8.13) (n = 25)
<0.55 ng	10.58 (10.62) (n = 23)

NGAL, neutrophil gelatinase‐associated lipocalin; PCNA, proliferating cell nuclear antigen; T/N ratio, ratio of tumour/corresponding normal tissue.