Fas-associated factor 1 (FAF1), a 74-kDa pro-apoptotic protein also known as Fas antigen, is involved in diverse biological processes [3], and its loss has been reported in uterine cervical carcinoma [4], mantle cell lymphoma [5] and malignant mesothelioma [6]. This evidence concerns the gene FAF1 and malignant mesothelioma.