On the other hand previous studies performed by this research group on the possible role of IL-1 and IL-6 in the differential diagnosis of PSP subtypes – PSP-RS and PSP-P, showed that in the serum and cerebrospinal fluid the level of both interleukins was higher in the clinically more favorable subtype (PSP-P), than in PSP-RS which is affected by more rapid deterioration (13). Here, IL6 is linked to supranuclear palsy, progressive, 1.