ER+ Breast CancerER-Positive / HER2-Negative
Distinguishing Luminal A from Luminal B
Plain-language notes on the difference between Luminal A and Luminal B breast cancer and why the distinction matters
This page is for the document on telling Luminal A apart from Luminal B breast cancer.
It should help readers understand why these two labels are related but not interchangeable.
Why this belongs here
This is a subtype-interpretation page inside the broader HR-positive, HER2-negative space.
It helps readers make sense of prognosis, biology, and treatment-intensity differences within receptor-positive disease.
Current focus
Use this page for:
how Luminal A and Luminal B differ
why proliferation markers and receptor context matter
how this distinction may shape treatment expectations