13548
Although great efforts in anti - ovarian cancer therapy have been made in the past 4 decades , the 5 - year survival rates for ovarian cancer patients are still poor , and effective drugs to cure ovarian cancer patients are absent .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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