The most typical kind of breast cancer is invasive ductal carcinoma.
Four different types of invasive ductal carcinoma are possible.
The first type is Luminal A, which has a very low Ki-67 index and many ER and PR Receptors but no her2 Neu Receptor.
Breast cancer of the Luminal A type is more common in elderly women.
And in such patients, chemotherapy can be avoided.
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