Hashimoto, Kazuhiko, et al. “Immunohistochemical Expression and Clinicopathological Assessment of PD-1, PD-L1, NY-ESO-1, and MAGE-A4 Expression in Highly Aggressive Soft Tissue Sarcomas”. European Journal of Histochemistry, vol. 66, no. 2, Apr. 2022, doi:10.4081/ejh.2022.3393.