Chromosome abnormality in solid and cystic tumor of the pancreas.

We report a case of a solid and cystic tumor of the pancreas with chromosomal abnormalities. The patient, a 13-yr-old girl, successfully underwent surgical excision and has been asymptomatic for more than 10 months. The tumor had two parameters suggesting malignant potential; a local invasion into a bile duct, and high mitotic activity. Chromosomal analysis showed two complex abnormalities, of which double loss of X chromosomes and trisomy for chromosome 3 were common. The complexity and polyclonality may stem from a clonal evolution. The observed abnormalities may provide a crucial clue to the understanding of the developmental process of this neoplasm.