520
The 8 patients receiving Ir192 implant in addition to external radiation showed improved ( p = 0 . 06 ) survival compared to the 9 receiving external only : median 15 months ( range 1 . 5 - 34 + months ) versus 7 months ( range 2 . 5 - 21 months ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None