12765
In histopathological analysis , the tumor sections of E2 or BP - 1 group displayed extensive cell formations with high density and disordered arrangement , which were supported by the increased number of BrdUrd positive nuclei and the over - expression of cyclin D1 protein .
 BP - 1
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 BP - 1