10407
Nonetheless , so far the major issue to deal with when trying to provide evidence for TNBC is the small numbers of the sample in the clinical studies and the retrospective nature of most of them .
 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