Nutritional biological parameters (albumin, prealbumin, urea, creatinin and eGFR according to the recent equation) were normal in the 2 groups; however compared to controls, PN patients displayed lower median albumin levels (84% of controls; p = 0.015) but higher prealbumin (127% of controls; p = 0.035) and urea levels (114% of controls; p = 0.048). This evidence concerns the gene TTR and poikiloderma with neutropenia.