IL17B and neoplasm: In agreement with the absence of rIL-17B effect on MCF-7 and MDA-MB-468 cell proliferation in vitro (Supplementary Figure 4A), constitutive IL-17B expression in MCF7-h-IL17B and MDA-MB-468-h-IL-17B cells did not have any effect on their expansion in vitro (Supplementary Figure 4B) and their tumor growth in vivo.