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According to the American Cancer Society , " available scientific evidence does not support claims that putting oxygen-releasing chemicals into a person 's body is effective in treating cancer " , and some of these treatments can be dangerous .
 American Cancer Society
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 American Cancer Society