ID1 and familial pancreatic carcinoma: The noticeable low‐level expression of endogenous ID1 protein in MDA‐MB‐231‐LM2 cells, together with a modest reduction of ID1 and VM formation following siRNA knockdown, prompted a search for VM‐competent cancer cells with higher endogenous levels of ID1; i.e., human pancreatic cancer cell lines AsPC‐1 and BxPC‐3.