Gene expression profiling in primary breast cancer distinguishes patients developing local recurrence after breast-conservation surgery, with or without postoperative radiotherapy

Table 4 A comparison between the LR⁺RT^- and LR^-RT^- subgroups

Factor	LR⁺RT^-	LR^-RT^-	P value
ER status, number
Negative	8	6
Positive	14	27	0.21^a
Median age, years
All	53	61	0.02^b
ER^- subgroup	59.5	54	0.90
ER⁺ subgroup	50.5	62	0.02
Histological grade, number
1	4	13
2	10	9
3	5	8	0.19^a
Median tumor size, millimeters	15	14	0.67^b

Only cases from inclusion 1 are included. ^aFisher exact test. ^bWilcoxon rank sum test. ER, = estrogen receptor; LR^-RT^- = no local recurrence, no radiotherapy given; LR⁺RT^- = local recurrence developed, no radiotherapy given.

ISSN: 1465-542X