5024
In sum , identification of PIM - 1 as an ER alpha target gene adds a novel potential mechanism by which estrogens can contribute to breast cancer cell proliferation and carcinogenesis .
 Chemical: estrogens
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: estrogens 
Answer:
 Chemical: estrogens