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A direct correlation was found between the extent of inflammation and nuclear grade (P less than 0.0001), and an inverse correlation between inflammation and oestrogen receptor ( OR ) positivity (P less than 0.05) as well as inflammation and progesterone receptor ( PR ) positivity (P less than 0.05).
 protein: OR; protein: progesterone receptor; protein: oestrogen receptor; protein: PR
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: OR; protein: progesterone receptor; protein: oestrogen receptor; protein: PR