11205
Although tamoxifen ( TAM ) , a selective estrogen receptor modulator , has been widely used in the treatment of hormone - responsive breast cancer , its estrogen - like effect increases the risk of endometrial cancer .
 tamoxifen, TAM, estrogen, estrogen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 tamoxifen, TAM, estrogen, estrogen