22915
Treatment with gefitinib induced mitochondrial dysfunction , cytochrome c release , caspase - 3 activation and poly ( ADP - ribose ) polymerase protein cleavage , indicating that apoptosis occurred in these cancer cells .
 Chemical: gefitinib; Chemical: poly ( ADP - ribose )
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: gefitinib; Chemical: poly ( ADP - ribose )