Rhabdoid tumor predisposition syndrome.

Area of Science:

• Oncology
• Genetics
• Cancer Biology

Background:

• Rhabdoid tumors (RT) are aggressive cancers, frequently occurring in the brain (AT/RT) or kidneys.
• Most RTs exhibit loss of function in the SMARCB1 gene, a key component of the SWI/SNF chromatin-remodeling complex.
• Mutations in SMARCA4 have also been identified in RTs where SMARCB1 remains functional.

Purpose of the Study:

• To review the genetic basis of rhabdoid tumors, focusing on SMARCB1 and SMARCA4 mutations.
• To discuss rhabdoid tumor predisposition syndrome (RTPS) and its genetic underpinnings.
• To highlight the importance of genetic counseling for families affected by RTPS.

Main Methods:

• Literature review of rhabdoid tumors and associated genetic mutations.
• Analysis of the role of SWI/SNF complex genes (SMARCB1, SMARCA4) in RT development.
• Examination of familial cases and the characteristics of RTPS.

Main Results:

• Rhabdoid tumors are strongly associated with biallelic inactivation of SMARCB1 or, less commonly, SMARCA4.
• Rhabdoid tumor predisposition syndrome (RTPS) arises from germline mutations in SMARCB1 (RTPS1) or SMARCA4 (RTPS2).
• RTPS patients may develop tumors earlier; adults with mutations can develop schwannomas.

Conclusions:

• RTPS diagnosis should be considered in patients with RT, especially with multiple tumors or family history.
• Germline mutations significantly increase the risk of developing RT.
• Genetic counseling is crucial for families with a history of RTPS to assess and manage cancer risk.