5087
In 83 % of samples , staining was moderate or high and clinical outcome in this subgroup showed a trend towards poorer prognosis [ hazard ratio for death 2 . 28 ( 95 % CI 0 . 99 - 5 . 28 ) ; p = 0 . 053 ] .
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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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