BAFF and APRIL have been reported to be trophic factors in lymphocyte malignancies and immune-related disorders (65), while they have been identified in bronchial tissue (66) and a number of immune-related and immune-independent normal and cancer tissues (spleen, liver, lung, heart, intestine, kidney, thymus, breast) (67), although the exact cellular population contributing to their expression was not clearly identified. Here, TNFSF13 is linked to cancer.