3440
Radiolabelling , following the in vivo injection of 3H - 17 beta estradiol , was increased only over the nuclei of tumor cells ; stereologic analysis revealed a 4 . 5 - to 6 . 7 - times higher concentration of reduced silver grains over nuclei than cytoplasm of these cells .
 Chemical: estradiol; Disease: tumor; Chemical: silver
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: estradiol; Disease: tumor; Chemical: silver