Estrogen-only therapy linked to breast lumps

• Story Highlights
• Estrogen-only users doubled chances of getting non-cancerous breast lumps
  
• Specific kind of lump, proliferative breast disease, a suspected cancer precusor
  
• Estrogen-only hormone therapy hasn't been linked to breast cancer
  
• Estrogen-only therapy available only to women who've had hysterectomies
  
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