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Lamivudine for the prevention of hepatitis B virus reactivation in hepatitis - B surface antigen ( HBSAG ) seropositive cancer patients undergoing cytotoxic chemotherapy .
 Lamivudine, hepatitis B, hepatitis - B surface antigen, HBSAG, cancer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Lamivudine, hepatitis B, hepatitis - B surface antigen, HBSAG, cancer