Characterization and prognosis of estrogen receptor-positive/progesterone receptor-negative male breast cancer: a population-based study

Table 4 Comparison of the overall survival among different age groups (log-rank)

PR status	Age at diagnosis	≤ 40	41–55	56–70	71–85	> 85	Survival months
PR status	Age at diagnosis	P value	P value	P value	P value	P value	Mean ± SD
Positive	≤ 40		0.800	0.154	< 0.001	< 0.001	184.0 ± 14.3
	41–55	0.800		0.010	< 0.001	< 0.001	193.7 ± 6.7
	56–70	0.154	0.010		< 0.001	< 0.001	153.3 ± 4.9
	71–85	< 0.001	< 0.001	< 0.001		< 0.001	91.2 ± 3.1
	> 85	< 0.001	< 0.001	< 0.001	< 0.001		48.8 ± 3.3
Negative	≤ 40		0.951	0.772	0.088	0.024	164.7 ± 31.3
	41–55	0.951		0.738	0.001	< 0.001	117.50 ± 8.0
	56–70	0.772	0.738		< 0.001	< 0.001	129.2 ± 9.3
	71–85	0.088	0.001	< 0.001		0.037	78.6 ± 6.4
	> 85	0.024	< 0.001	< 0.001	0.037		44.4 ± 8.1

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