Table 2.

Distribution of the BC surrogate intrinsic subtypes, revealing a shift in subtype between PTs and synchronous ALN metastases.

	n = 36
	Primary tumor	ALN metastases
Luminal	18	17
- A-like	12*	12*
- B-like	6	5
Other	18	19
Shift in	Primary tumor -> ALN metastasis
Subtype
- other -> luminal-like	5
- luminal-like -> other	6

*Nine cases showed consistent luminal A-like subtype in both paired PT and matched ALN metastasis.

ALN, axillary lymph node; PT, primary tumor.