Table 1

Distribution of risk factors across patients with primary breast cancer and lymph node metastasis

Risk factorn (%)
Age >5016 (64)
Age ≤509 (36)
Grade 2a7 (33)
Grade 314 (67)
ER−/PR−b17 (68)
ER+/PR+8 (32)
Stage 2a6 (30)
Stage 314 (70)
  • a Grade and stage not available for grade/stage four and grade/stage five samples, respectively.

  • b ER, estrogen receptor; PR, progesterone receptor.