Q:

Which area of the breast is most commonly affected by breast cancer?

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Which area of the breast is most commonly affected by breast cancer?


  1. Upper outer quadrant.
  2. Upper inner quadrant.
  3. Lower outer quadrant.
  4. Lower inner quadrant.
  5. Retro-areolar.

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a. Approximately 45% of breast cancers occur in the upper outer quadrant of the breast. A quarter of cancers occur in the retro-areolar region with the lower inner quadrant being the least common site of tumours.

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