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Therefore , to understand how ErbB1 / ErbB2 signaling contributes to this process , we used the ErbB kinase inhibitor AG1478in ErbB2 - dependent BT - 474 and SKBR - 3 human breast cancer cells .
 ErbB1, ErbB2, ErbB kinase, ErbB2
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 ErbB1, ErbB2, ErbB kinase, ErbB2