TNFRSF4 and Alzheimer disease: Similarly, there exist elevated soluble OX40L in psoriatic patient serum (Guo et al., 2019), increased number of OX40+ cells in psoriatic and AD lesions (Fujita et al., 2011; Guo et al., 2019), and strong correlations between AD disease activity scores and dermal OX40L abundance (Elsner et al., 2020).