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Long - term oestrogen - only HT significantly increased the risk of venous thrombo - embolism , stroke and gallbladder disease ( after one to two years , three years and seven years ' use respectively ) , but did not significantly increase the risk of breast cancer .
 Chemical: oestrogen; Disease: venous thrombo - embolism; Disease: stroke; Disease: gallbladder disease; Disease: breast cancer
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: oestrogen; Disease: venous thrombo - embolism; Disease: stroke; Disease: gallbladder disease; Disease: breast cancer