Table 1.

Oncotype DX ER Gene Scores and Recurrence Scores (RS) for early-stage ER-positive breast cancer, categorized by percentage of tumor cells with ER expression and intensity score (IS). *One case had two tumors in one block; one tumor was ER low and the other ER high, likely resulting in a positive quantitative ER gene score.

ER Group	ER-Low subgroup	n	ER Gene score negative (%)	RS (range)	RS > 25 (%)
ER-low	Low weak	12	11 (91.7)*	27–70	12 (100)
	Low only	2	2 (100)	42–56	2 (100)
	Weak only	13	10 (76.9)	25–65	11 (84.6)
ER-high		46	0 (0)	0–43	6 (12.0)