Table I.

Patient and tumour characteristics of the study population of HER2-positive early-stage breast cancer patients diagnosed at the Cambridge Breast Unit between January 2007 and October 2011 (n=109).

Characteristic	Value
Mean patient age (range), years	59.6 (28–83)
Mean tumour size (range), mm	22.8 (3–80)
Tumour grade, n
Grade 1	1
Grade 2	32
Grade 3	76
LN status, n
LN-negative	60
1–3 LNs	32
≥4 LNs	14
Unknown	3
ER status, n
Positive	90
Negative	19

LN, lymph node; ER, oestrogen receptor; HER2, human epidermal growth factor 2.