20700
Treatment of differentiated thyroid carcinomas is well standardized and the use of radioiodine represents an essential step ; in contrast , there is no standardized therapeutic approach for anaplastic tumors and their prognosis is poor .
 Chemical: radioiodine
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: radioiodine