# Distinguishing Luminal A from Luminal B

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

### Likely related pages

* ER+/PR- Receptor Status
* [Letrozole Side Effects and Possible Considerations](/myhealingcommunity-docs/breast-cancer/er-positive-her2-negative/letrozole-side-effects-and-possible-considerations.md)
* Fulvestrant and the Keto Diet


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