Intragenic deletions and a deep intronic mutation affecting pre-mRNA splicing in the dihydropyrimidine dehydrogenase gene as novel mechanisms causing 5-fluorouracil toxicity

André B. P. van Kuilenburg; Judith Meijer; Adri N. P. M. Mul; Rutger Meinsma; Veronika Schmid; Doreen Dobritzsch; Raoul C. M. Hennekam; Marcel M. A. M. Mannens; Marion Kiechle; Marie-Christine Etienne-Grimaldi; Heinz-Josef Klümpen; Jan Gerard Maring; Veerle A. Derleyn; Ed Maartense; Gérard Milano; Raymon Vijzelaar; Eva Gross