POP1 and neoplasm: When compared, non-tumor FlowSOM.Pop0 and Pop2 clusters harbor similar types of cells (likely hematopoietic and endothelial) to those detected in the tumor FlowSOM.Pop3 and Pop1 clusters, respectively, except for the SSEA3 and SSEA1 expression patterns being reciprocally inverted between the NT and tumor samples (supplemental Fig. S3C and Fig. 4C).