20898
INTRODUCTION : Several conventional pharmaceuticals like non - steroidal anti - inflammatory drugs ( NSAIDS ) or selective cyclooxygenase - 2 ( COX - 2 ) inhibitors have been demonstrated to exert anti - proliferative effects and to induce apoptosis in a variety of cell lines , e . g . colon , stomach , or prostate cancer cells .
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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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