FAS and neoplasm: Tumour-expressed FasL has also been shown to be associated with metastasis of tumour cells to the lymph nodes and liver (Mann et al, 1999; Younes et al, 2000), whereas ligation of Fas by FasL can stimulate cell proliferation (Lambert et al, 2003; Li et al, 2008), and increase tumour cell motility and invasiveness (Barnhart et al, 2004; Peter et al, 2007).