The variations of lymphocyte subsets have been studied both in neoplastic and chronic inflammatory elderly patients compared to a control group. The interpretation of the Multivariate Analysis of Variance (MANOVA) and of the Factorial Analysis has demonstrated the opposite role of TCD4 subset, mainly involved in the inflammatory process, and of TCD8 subset in regard of the neoplastic ones. We report the slight and yet significant increase of NK related to age. Independently from the disease pattern, factorial analysis permitted a comparison between the variations of lymphocyte subsets and the different grades of immunoresponse.