| Literature DB >> 35483881 |
Hannah N Bell1, Chandan Kumar-Sinha2,3,4, Rahul Mannan1,3,4, Dana Zakalik5, Yuping Zhang2,3,4, Rohit Mehra1,3,4, Deepa Jagtap5, Saravana M Dhanasekaran2,3,4, Ulka Vaishampayan1,6.
Abstract
Metastatic renal cell carcinoma (RCC) remains an incurable malignancy, despite recent advances in systemic therapies. Genetic syndromes associated with kidney cancer account for only 5%-8% of all diagnosed kidney malignancies, and genetic predispositions to kidney cancer predisposition are still being studied. Genomic testing for kidney cancer is useful for disease molecular subtyping but provides minimal therapeutic information. Understanding how aberrations drive RCC development and how their contextual influences, such as chromosome loss, genome instability, and DNA methylation changes, may alter therapeutic response is of importance. We report the case of a 36-yr-old female with aggressive, metastatic RCC and a significant family history of cancer, including RCC. This patient harbors a novel, pathogenic, germline ATM mutation along with a rare germline variant of unknown significance in the BAP1 gene. In addition, somatic loss of heterozygosity (LOH) in BAP1 and ATM genes, somatic mutation and LOH in the VHL gene, copy losses in Chromosomes 9p and 14, and genome instability are also noted in the tumor, potentially dictating this patient's aggressive clinical course. Further investigation is warranted to evaluate the association of ATM and BAP1 germline mutations with increased risk of RCC and if these mutations should lead to enhanced and early screening.Entities:
Keywords: clear cell renal cell carcinoma
Mesh:
Substances:
Year: 2022 PMID: 35483881 PMCID: PMC9059789 DOI: 10.1101/mcs.a006203
Source DB: PubMed Journal: Cold Spring Harb Mol Case Stud ISSN: 2373-2873
Figure 1.Disease progression from diagnosis to metastasis. A 36-year-old female presented to the emergency department with flank pain and hematuria and was diagnosed with clear cell renal cell carcinoma (ccRCC) in October of 2019. Lung metastases were noted, as well as hereditary mutations in BAP1 and ATM in April of 2020.
Figure 2.BAP1 staining in primary kidney tumor correlates with grade. (A) Photomicrograph of the right renal mass exhibiting high-grade and low-grade areas of clear cell renal cell carcinoma (hematoxylin and eosin [H&E]; 200×). The corresponding areas showing (B) strong brown membranous staining with carbonic anhydrase IX (CA9; 200×) immunohistochemistry and (C) loss of BRCA1-associated protein 1(BAP1; 200×) immunoexpression in tumor epithelia. (D) The tissue section from the tubo-ovarian metastatic mass shows sarcomatoid differentiation with focal areas of necrosis (H&E; 200×). The corresponding areas (E) exhibiting strong membranous immunoexpression of carbonic anhydrase IX (CA9; 200×) with loss of BRCA1-associated protein 1(BAP1; 200×) immunoexpression in tumor epithelia (F).
Figure 3.Chromosome plot of the primary renal tumor compared to the fallopian tube metastasis. The kidney tumor and the fallopian tube metastatic tumor have very similar genomic landscapes. They both have uniparental disomy of the regions encompassing VHL, BAP1, and ATM.
Germline, kidney, and adnexal mutations
| Germline | Kidney | Adnexal metastasis |
|---|---|---|
| FANCM p.M1397V | ||
Sequencing quality assessment
| Sample site | Sample quality | Sequencing quality | Library quality | Sample identity (SNP fingerprinting) |
|---|---|---|---|---|
| Fallopian tube | 20% tumor content | Splice junction coverage < 40,000 | Pass | Pass |
| Right kidney | Pass | Pass | Pass | Pass |
(SNP) Single-nucleotide polymorphism.
Detailed mutation information
| Gene | Site | Chromosome | HGVS DNA reference | HGVS protein reference | Variant type | Predicted effect | dbSNP/dbVar ID | Allelic fraction |
|---|---|---|---|---|---|---|---|---|
|
| Germline | Chr 3: 52407219 | NM_004656:c.535C > T | p.Arg179Trp | Missense | Substitution | N/A | Normal allelic fraction: 50.20%; tumor allelic fraction: 78.90% |
|
| Germline | Chr 11: 108365356 | NM_000051:c.9019G > T | p.Glu3007Ter | Missense | Substitution | N/A | Normal allelic fraction: 54.10%; tumor allelic fraction: 74.70% |
|
| Germline | Chr 11: 44232436 | NM_000401:c.1845T > A | p.Tyr615Ter | Missense | Substitution | N/A | Normal allelic fraction: 52.20%; tumor allelic fraction: 54.10% |