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In addition , MCF7 cells with forced expression of recombinant ER - alpha 36 and H3396 cells expressing high concentrations of endogenous ER - alpha 36 were resistant to tamoxifen .
 tamoxifen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 tamoxifen