Inherited partial trisomy #15 complicated by neuroblastoma

Area of Science:

• Genetics
• Oncology
• Developmental Biology

Background:

• The proband presented with multiple congenital malformations.
• A constitutional chromosomal abnormality, 46,XY,-13,+der(13),t(13;15)(q34;q23)mat, was identified.

Purpose of the Study:

• To analyze the chromosomal complement of a patient with neuroblastoma and congenital malformations.
• To investigate the potential role of inherited chromosomal abnormalities in predisposition to neuroblastoma and secondary genetic changes.

Main Methods:

• Cytogenetic analysis of bone marrow aspirate.
• Karyotyping of tumor cells to identify chromosomal aberrations.
• Analysis of constitutional and tumor-specific genetic alterations.

Main Results:

• Neuroblastoma was diagnosed in the bone marrow.
• Tumor cells exhibited hypotetraploidy (82-84 chromosomes) with multiple copies of autosomes.
• Specific translocations involving chromosomes 1, 2, 3, 7, and 14 were observed, along with double minutes.
• Partial trisomy 15 and probable partial monosomy 13 were present in tumor cells.

Conclusions:

• The inherited partial trisomy 15 and/or partial monosomy 13 may predispose to neuroblastoma.
• Additional complex chromosomal changes in the tumor suggest a role in neuroblastoma development.
• This case highlights the intricate relationship between germline chromosomal abnormalities and tumorigenesis.