59
BACKGROUND : Although the prevalence of nonsmall cell lung carcinoma ( NSCLC ) is high among elderly patients , few data are available regarding the efficacy and toxicity of chemotherapy in this group of patients .
 nonsmall cell lung carcinoma, NSCLC, toxicity
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 nonsmall cell lung carcinoma, NSCLC, toxicity