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Fractures can also occur when a bone is weakened , such as with osteoporosis , or when there is a structural problem , such as when the bone remodels excessively ( such as Paget 's disease ) or is the site of the growth of cancer .
 Paget 's disease
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Text: {0} 
Answer:
 Paget 's disease