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We then examined the chemosensitization of cisplatin by pre - treatment of PARP - 1 inhibitors in cisplatin - resistant human gastric cancer cells .
 Chemical: cisplatin; Chemical: cisplatin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: cisplatin; Chemical: cisplatin