TCF7L2 and diabetes mellitus: Since diabetes in TCP is also thought to be due to destruction of endocrine pancreatic cells secondary to destruction of exocrine pancreas, we investigated the interaction between the TCF7L2 variants and N34S SPINK1 and L26V CTSB mutations and explored whether presence of TCF7L2 variants in patients with these mutations predisposes them to FCPD.