75
We further used immunohistochemistry ( IHC ) to examine the relative role of platelet - derived growth factor - B ( PDGF - B ) , insulin - like growth factor I ( IGF - I ) , transforming growth factor - beta1 ( TGF - beta1 ) and cyclooxygenase-2 ( COX-2 ) in the pathogenesis of BCNU - related pulmonary fibrosis .
 pulmonary fibrosis, BCNU
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: adverse effect 
Text: {0} 
Answer:
 pulmonary fibrosis, BCNU