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In tumor xenograft models of several drug - resistant human cancers , we observed an efficient inhibition of tumor growth and extended the life - span of the animals by 3 times that of the control with orally treated Gemcitabine - or Floxuridine - nanogel conjugates .
 Chemical: Gemcitabine; Chemical: Floxuridine
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: Gemcitabine; Chemical: Floxuridine