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Integrase Interactor 1 (INI-1) Deficient Renal Cell Carcinoma
Manpreet Singh1, Harkirat Singh1, Benjamin Hambro1
1Internal Medicine, St Agnes Medical Center, Fresno, USA.
Cureus
|March 8, 2021
Summary
SWI/SNF related, matrix-associated, actin-dependent regulator of chromatin, subfamily A, member 4 (SMARCA4) deficiency is linked to aggressive renal tumors. This case highlights the critical role of SMARCA4 in preventing aggressive tumor development.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- The SWI/SNF (Switch/sucrose nonfermentable) chromatin remodeling complex, including subunits SMARCA4 and SMARCB1/INI-1, functions as a tumor suppressor.
- Loss of SMARCB1/INI-1 protein expression is characteristic of rhabdoid tumors, indicating its crucial role in preventing tumorigenesis.
Observation:
- Germline and sporadic mutations in SWI/SNF components are associated with various cancers, often presenting with sarcomatoid features.
- Renal medullary carcinoma is an aggressive cancer linked to SWI/SNF pathway mutations.
Findings:
- A 29-year-old male presented with a renal tumor deficient in SMARCA4 (SWI/SNF related, matrix-associated, actin-dependent regulator of chromatin, subfamily A, member 4).
- This SMARCA4-deficient renal tumor exhibited highly aggressive clinical behavior.
Implications:
- SMARCA4 deficiency is implicated in the development of aggressive renal tumors.
- This case underscores the importance of SMARCA4 in tumor suppression and suggests it as a potential target for therapeutic strategies in aggressive renal cancers.
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