circvIRF4 and circPAN/K7.3 in KS tissues and serum were further investigated by the study of Abere et al., showing that 61/92 (66.3%) KS tissues were positive for KSHV circRNAs, namely 32/92 (34.8%) for circvIRF4, 49/92 (53.3%) for circPAN and 28/92 (30.4%) for circK7.3. This evidence concerns the gene KRT7 and Kaposi's sarcoma.