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The cytotoxicity study with breast cancer cells ( MCF - 7 and MDA - MB - 231 ) and non - cancerous breast epithelial cell ( MCF - 10A ) showed that rationally selected ligands with cancer - cell targeting ability on POM - biomolecule conjugates can impart enhanced anti - tumor activity and selectivity , thus representing a new concept to develop novel POM - biomolecule hybrid drugs with the potential synergistic effect : increased bioactivity and lower side effect .
 Chemical: POM; Chemical: POM
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: POM; Chemical: POM