Hereditary multiple exostoses: report of a kindred

Area of Science:

• Genetics
• Oncology
• Orthopedics

Background:

• Multiple hereditary exostoses (MHE) is a genetic disorder characterized by the development of numerous bone tumors (exostoses).
• The reported incidence of malignant transformation (sarcomatous degeneration) in MHE lesions varies widely in the literature, often cited between 10% and 25%.

Observation:

• A study of a large family with 37 members affected by MHE found only one instance of sarcomatous degeneration.
• A systematic review of existing literature indicated significant sampling errors in previous studies.
• These errors likely led to an overestimation of the true risk of malignancy in MHE.

Findings:

• In large pedigrees with comprehensive ascertainment, the actual risk of sarcomatous degeneration in MHE is estimated to be approximately 3% or lower.
• This revised risk assessment challenges previously accepted figures.

Implications:

• The findings suggest a need to revise current risk counseling for individuals with MHE.
• Accurate risk assessment is essential for appropriate patient management and psychological support.
• Further research with robust methodologies is warranted to confirm these estimates.