FAP and mucinous neoplasm: Interestingly, in the patient with stage IA adult granulosa cell tumor, we observed low expression of FAP-A mRNA parallel to 0.10% expression of FAP-A protein by flow cytometry, which was in contrast to the patient with grade 1, stage IVA low-grade appendiceal mucinous neoplasm whose CAFs exhibited high expression of FAP-A mRNA (Figure 3, Figure 4 and Figure 5) indicating their subtypes as CAF-S4 (FAP-/SMAhigh) and CAF-S1 (FAPhigh/SMAhigh), respectively.