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Table 1 Tumour characteristics where paired serum available

From: Serum epidermal growth factor receptor and HER2 expression in primary and metastatic breast cancer patients

Characteristic   Value
Tumour size T1 21 (36.8)
  T2 30 (52.6)
  T3 5 (8.8)
  Not known 1 (1.8)
Grade 1 2 (3.5)
  2 14 (24.6)
  3 35 (61.4)
  Not known 6 (10.5)
Lymph node status None 22 (38.6)
  1 to 3 22 (38.6)
  >3 10 (17.5)
  Not known 3 (5.3)
NPI ≤3.4 5 (8.8)
  3.5 to 5.4 23 (40.4)
  >5.4 19 (38.3)
  Not known 10 (17.5)
ER status Negative 22 (38.6)
Age (years)   53 (30–86)
  1. Paired serum samples were available for 57 patients. Values expressed as n (%) apart from age, which is expressed as median (range). ER, oestrogen receptor; NPI, Nottingham Prognostic Index.