CD4 and non-small cell lung carcinoma: Our results showed a higher percentage of NK cells, memory T cells (CD4+CD45RO+, CD8+CD45RO+), activated T cells (CD4+DR+, CD8+DR+) and Tregs (CD4+CD25brightCD127dim) cells in the peripheral blood of NSCLC patients in comparison to the healthy controls, indicating a certain level of immune response in the patients.