23141
Although , it is considered as a benign lesion and treated conservatively previously , more and more cases show that APA has a high rate of recurrence or residual , and is found to precede the development of carcinoma .
 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