4484
There is no difference in breast - cancer frequency between the placebo ( 22 cases ) and tamoxifen ( 19 ) arms .
 Disease: breast - cancer; Chemical: tamoxifen
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:
 Disease: breast - cancer; Chemical: tamoxifen