1806
The Gastrointestinal Tumor Study Group ( GITSG ) protocol GI - 7175 randomized 227 patients between 1975 and 1980 following complete surgical resection of stages B2 and C rectal adenocarcinoma to four treatment arms : ( 1 ) no adjuvant therapy , ( 2 ) chemotherapy only , ( 3 ) radiotherapy only , and ( 4 ) radiotherapy and chemotherapy ( combined modality ) .
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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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