NUT Carcinoma: Clinicopathologic features, pathogenesis, and treatment
1Department of Pathology, Brigham and Women's Hospital/Harvard Medical School, Boston, MA, USA.
Abstract:
NUT carcinoma (NC) is a rare, aggressive subtype of squamous cell carcinoma defined by rearrangement of the NUTM1 (aka NUT) gene. NC is driven by NUT-fusion oncoproteins resulting from chromosomal translocation, most commonly BRD4-NUT. This is a nearly uniformly lethal cancer affecting patients of all ages, but predominantly teens and young adults. The cell of origin is unknown, but NC most commonly arises within the thorax and head and neck. NC typically consists of sheets of monomorphic primitive round cells that can exhibit focal abrupt squamous differentiation. Diagnosis of NC is easy, and can be established by positive NUT nuclear immunohistochemical staining. Though characterization of the NUTM1-fusion gene is desirable by molecular analysis, it is not required for the diagnosis. The increasingly widespread availability of the NUT diagnostic test is leading to increasing diagnoses of this vastly underdiagnosed disease. The NUT midline carcinoma registry (www.NMCRegistry.org) serves as a central repository that has provided the main source of clinical and outcomes data for NC. Currently there is no effective therapy for NC, however small molecules directly targeting the BRD4 portion of BRD4-NUT, termed BET bromodomain inhibitors, have shown activity.
Insights
NUT carcinoma (NC) is a rare, aggressive cancer driven by NUTM1 gene rearrangements. While difficult to treat, diagnostic tests are improving, and BET bromodomain inhibitors show promise.
Area of Science:
- Oncology
- Genetics
- Pathology
Background:
- NUT carcinoma (NC) is a rare, aggressive squamous cell carcinoma characterized by NUTM1 gene rearrangements.
- The cancer is driven by NUT-fusion oncoproteins, frequently BRD4-NUT, and predominantly affects adolescents and young adults.
- NC typically arises in the thorax and head and neck, presenting as primitive round cells with potential squamous differentiation.
Purpose of the Study:
- To summarize the key characteristics of NUT carcinoma.
- To highlight diagnostic methods and current therapeutic challenges.
- To discuss emerging treatment strategies for this rare cancer.
Main Methods:
- Review of existing literature and clinical data on NUT carcinoma.
- Analysis of diagnostic criteria, including immunohistochemical staining for NUT.
- Examination of therapeutic approaches, including targeted therapies.
Main Results:
- NC diagnosis is facilitated by NUT nuclear immunohistochemical staining, though molecular analysis of NUTM1-fusion genes is desirable.
- The NUT midline carcinoma registry provides crucial clinical and outcomes data.
- Currently, no definitive therapy exists, but BET bromodomain inhibitors targeting BRD4-NUT show activity.
Conclusions:
- NUT carcinoma is a distinct and aggressive entity requiring accurate diagnosis.
- Improved diagnostic test availability is increasing NC diagnoses.
- Targeting BRD4-NUT with BET inhibitors represents a promising therapeutic avenue for NC.
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