IL15 and posterior cortical atrophy: Most interestingly, serum levels of IL-7 and IL-15 were also significantly higher in patients with localized PCA as compared to patients with BPH (average IL-7 concentration ± SEM = 32.69 ± 9.73 vs. 5.87 ± 1.17 pg/ml, p = 0.0174 and average IL-15 concentration ± SEM 208.07 ± 48.50 vs. 50.51 ± 14.34 pg/ml, p = 0.0064, figure 3A.1.).