Low expression of the X-linked ribosomal protein S4 in human serous epithelial ovarian cancer is associated with a poor prognosis

Table 2 Spearman correlation test (two-tailed) for YB-1 and PRS4X expression (intensity) in EOC tissues and clinical data of patients

		YB-1	RPS4X	Ki67 % total	Stage	Age	Residual disease
YB-1	correlation	1	0.391**	0.315**	−0.016	0.004	−0.053
YB-1	Sig. (2-tailed)		<0.001	<0.001	0.829	0.961	0.535
	N	186	186	180	186	186	137
RPS4X	correlation	0.391**	1	0.224**	−0.180*	0.041	−0.193*
RPS4X	Sig. (2-tailed)	<0.001		0.002	0.013	0.557	0.022
	N	186	190	183	190	190	141

* Correlation is significant at the 0.05 level (2-tailed).
** Correlation is significant at the 0.01 level (2-tailed).
Spearman correlation test were performed on clinical data, total Ki67%, YB-1, and PRS4X staining intensity observed in the intra-epithelial area of ovarian tumors. Stage was evaluated according to the FIGO classification. “Sig.” in the table represents the P-value from Spearman correlation test. N is the number of cases included in the statistical analysis.

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