937
Probable progressive multifocal leukoencephalopathy ( PML ) was diagnosed on the basis of clinical picture and magnetic resonance imaging in a 63 - year - old man with a complete remission of a non - Hodgkin ' s lymphoma .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None