To determine the primary cell populations expressing Spp1 (Spp1), Ltf (Ltf), Calr (Calr), and Prdx2 (Prdx2), we conducted qPCR analysis of whole spleen tissue, where MDSCs were mainly generated, MDSCs sorted from tumors, and cancer cells (Fig. 5a). Here, PRDX2 is linked to cancer.