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Skin rash was absent in 26 ( 23 . 9 % ) patients and associated with shorter overall survival compared with patients presenting skin rash ( P = 0 . 005 ) .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None