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Therefore, the high radiosensitivity of squamous cell carcinomas in our samples could be explained by an overexpression of c-fos in the tumor-infiltrating lymphocytes induced by small doses of radiation therapy , and these activated lymphocytes exerted a cytotoxic effect against the cancer cells .
 c-fos, tumor-infiltrating lymphocytes, cancer cells, activated lymphocytes
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 c-fos, tumor-infiltrating lymphocytes, cancer cells, activated lymphocytes