30321
PURPOSE : Polymorphisms in the CYP19A1 ( aromatase ) gene have been reported to influence disease - free survival and the incidence of musculoskeletal complaints in patients taking aromatase inhibitors ( AIs ) for estrogen receptor positive ( ER + ) breast cancer .
 Chemical: estrogen
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: estrogen