8053
3 - Drug PEG - b - PCL micelles were not significantly more potent in 2 - D cell culture in comparison to paclitaxel ; however , they disaggregated ES - 2 tumor spheroids , whereas single drugs or 2 - drug combinations only slowed growth of ES - 2 tumor spheroids or had no noticeable effects .
 Chemical: PEG - b - PCL; Chemical: paclitaxel
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: PEG - b - PCL; Chemical: paclitaxel