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The immunotherapy is not only to target and kill tumor cells in aspecific manner , but also to alert the immune system to eradicate the disseminated tumor cells present in the blood circulation and micro - metastases in remote organs .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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