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Early data indicated that poly ( ADP - ribose ) polymerase ( PARP ) inhibitors exploiting the concept of synthetic lethality would offer improved outcomes for patients with ER - negative , progesterone receptor ( PR ) - negative , HER2 - negative breast cancer often referred to as triple negative breast cancer ( TNBC ) ; however , data in the phase III setting failed to confirm these findings but this may be because the drug was not a true PARP inhibitor .
 Chemical: poly ( ADP - ribose ); Chemical: progesterone
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: poly ( ADP - ribose ); Chemical: progesterone