20893
Although evidence , in general , is sparse and fragmentary , merging knowledge links drug resistance , and also sensitivity , to defects in functional pathways having a key role in cell growth arrest or death and DNA repair .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None