Table 4. qRT-PCR detects the expression levels of ER and PR in the two groups of patients ($\overline{x}\pm s$).

Variate	Observation group	Control group	t	P
Number of cases (n)	54	54	–	–
ER	1.38±0.31	0.97±0.12	9.064	<0.01
PR	1.15±0.19	0.95±0.11	6.694	<0.01

ER, estrogen receptor; PR, progesterone receptor.