CTLA-4 expression in the non-small cell lung cancer patient tumor microenvironment: diverging prognostic impact in primary tumors and lymph node metastases. - Paulsen, Erna-Elise; Kilvaer, Thomas; Rakaee, Mehrdad; Richardsen, Elin; Hald, Sigurd; Andersen, Sigve; Busund, Lill-Tove; Bremnes, Roy; Donnem, Tom (Cancer Immunology, Immunotherapy, 2017)