MC and their transdifferentiated counterparts are also involved in tumor progression, as they were shown to contribute to OC metastasis by secreting Fibronectin [93], and to support the progression of primary effusion lymphoma (PEL) [94], a non-Hodgkin’s lymphoma that primarily grows as recurrent effusions in large body cavities [95]. The gene discussed is FN1; the disease is primary effusion lymphoma.