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Future efforts in this area should be focused on designing materials to solve problems such as cancer metastasis , multidrug resistance ( MDR ) in cancer cells , and early - stage cancer diagnosis .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None