Compared to patients with KS alone, samples from patients with KS and concurrent KAD (KICS or MCD and/or PEL) had differential expression of 26 genes; this included increased expression of the cellular genes STC1 (log2FC=2.02, p-adjusted (padj)=0.001), a secreted glycoprotein, and MKI67 (log2FC=1.11, padj=0.02), a common proliferation marker (Figure 2A, B). Here, STC1 is linked to primary effusion lymphoma.