22947
Since the prevalent hormonal combination therapy with estrogen analogues in cancer patients has frequency and possibility to induce the cholestasis , the frequent combination therapy with 17 alpha - ethynylestradiol ( EE , an oral contraceptive ) and doxorubicin ( an anticancer drug ) might be monitored in aspect of efficacy and safety .
 Chemical: estrogen; Chemical: 17 alpha - ethynylestradiol; Chemical: doxorubicin
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; Chemical: 17 alpha - ethynylestradiol; Chemical: doxorubicin