1659
First , two MCTs using a long electrode , 3 cm in size , were performed in the central area of the tumor , and eight MCTs by a short electrode , 2 cm in size , were done in the peripheral and surrounding area of the tumor .
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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:
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