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This report describes the first successful case of preimplantation genetic diagnosis (PGD) for myotonic dystrophy type Curschmann–Steinert (DM1) using polar body biopsy with vitrification. A 39-year-old woman with expansion of a CTG trinucleotide repeat in the DMPK gene was included into the study centre's PGD programme. After intracytoplasmic sperm injection, a total of 13 fertilized oocytes were...