CASP6 and angiosarcoma: Using Western blot analysis, we confirmed a subset of the data obtained in our antibody array by analyzing tumor lysates collected from ROCK1 and 2 shRNA knockdowns and scrambled control xenograft angiosarcoma tumors, revealing ROCK1 shRNA mediated increases in p53, Nfkb-p105/p50 (pSer337), and Casp6 levels (Fig. 5b).