4301
Over expression of vascular endothelial growth factor and its receptor during the development of estrogen - induced rat pituitary tumors may mediate estrogen - initiated tumor angiogenesis .
 Chemical: estrogen; Disease: pituitary tumors; Chemical: estrogen; Disease: tumor
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: estrogen; Disease: pituitary tumors; Chemical: estrogen; Disease: tumor