Surgery

Breast Cancer

Q: What is the most common location of origin for breast cancers?

Terminal duct-lobular units (TDLUs) are the origin of most breast cancers. This is clearly stated in the anatomy section of the summary.

Q: Which lymph node level drains to the pectoralis minor muscle laterally?

Level I lymph nodes are lateral to the pectoralis minor muscle. Level II is posterior, and Level III is medial (apical) to the pectoralis minor.

Q: What percentage of breast lymphatic drainage goes to axillary nodes?

Approximately 75% (~75%) of breast lymphatic drainage goes to axillary nodes, as stated in the anatomy and physiology section.

Q: Which molecular subtype of breast cancer has the best prognosis?

Luminal A (ER+/PR+, HER2−) has slow growth and the best prognosis among the molecular subtypes listed in the summary.

Q: What is the most common histological type of invasive breast cancer?

Invasive ductal carcinoma (IDC) accounts for approximately 75% of invasive breast cancers, making it the most common histological type.

Breast cancer is a malignant neoplasm arising most commonly from the terminal duct-lobular units of the breast, representing the most common cancer in women worldwide with significant morbidity and mortality if not detected early. Its clinical significance lies in the diverse molecular subtypes—luminal A, luminal B, HER2-enriched, and triple-negative—which dictate prognosis and guide targeted therapeutic strategies including hormonal therapy, HER2-directed agents, and immunotherapy. Medical students must understand the triple assessment approach combining clinical examination, imaging, and pathological confirmation, as well as the TNM staging system, because early recognition and appropriate classification directly impact treatment decisions and patient survival outcomes.

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1. What is the most common location of origin for breast cancers?

2. Which lymph node level drains to the pectoralis minor muscle laterally?

3. What percentage of breast lymphatic drainage goes to axillary nodes?

4. Which molecular subtype of breast cancer has the best prognosis?

5. What is the most common histological type of invasive breast cancer?

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Breast Cancer

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