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Within Stage IA , 141 patients had well differentiated tumor ( G1 ) , 20 had moderately well differentiated tumor ( G2 ) , and 12 patients had poorly differentiated ( G3 ) .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None