27644
At the last follow - up ( low activities , median 4 . 2 years : high activities median 6 . 9 years ) remission was observed in 76 . 5 % of patients treated with low and in 72 . 1 % of patients treated with high RAI activities , persistent disease was observed in 18 . 8 % of patients treated with low and in 23 . 5 % of patients treated with high RAI activities , recurrent disease was 2 . 4 % in patients treated with low and 2 . 1 % in patients treated with high RAI activities , deaths occurred in 2 . 4 % of patients treated with low and in 2 . 1 % of patients treated with high RAI activities ( p = 0 . 87 ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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