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CD8+ T lymphocytes in hypopigmented mycosis fungoides: malignant cells or reactive clone?

ABSTRACT: CD8+ T lymphocytes in hypopigmented mycosis fungoides: malignant cells or reactive clone?

PROVIDER: PRJNA874095 | ENA |

REPOSITORIES: ENA

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CD8+ T lymphocytes in hypopigmented mycosis fungoides: malignant cells or reactive clone?

Project description:We used targeted single cell RNA sequencing using a gene set composed of the BD Rhapsody Human Immune Response Panel, TCR panel, and a custom panel of 61 malignancy-associated genes and T/B cell receptor sequencing to characterize single cell populations in hypopigmented mycosis fungoides (HMF). Using a reference mapping model built on publically deposited classic mycosis fungoides single cell RNA sequencing datasets, we identified a predicted malignant cell population independent from the clonal T cell population in HMF.

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Project description:Mycosis fungoides patients who develop tumors or extracutaneous involvement usually have a poor prognosis with no curative therapy available so far. In the present EORTC multicenter study, the genomic profile of 41 skin biopsies from tumor-stage mycosis fungoides was analyzed using a high-resolution oligo-array comparative genomic hybridization platform. Seventy-six percent of cases showed genomic aberrations. The most common imbalances were gains of 7q33.3q35 followed by 17q21.1, 8q24.21, 9q34qter and 10p14 and losses of 9p21.3 followed by 9q31.2, 17p13.1, 13q14.11, 6q21.3, 10p11.22, 16q23.2 and 16q24.3. Three specific chromosomal regions, 9p21.3, 8q24.21 and 10q26qter were defined as prognostic markers exhibiting a significant correlation with overall survival (P= .042, P= .017 and P= .022, respectively). Moreover, we have established two MFt genomic subgroups distinguishing a stable group (0-5 DNA aberrations) and an unstable group (> 5 DNA aberrations), showing that the genomic unstable group had a shorter overall survival (P=.05). We therefore conclude that specific chromosomal abnormalities, such as gains of 8q24.21 (MYC) and losses of 9p21.3 (CDKN2A, CDKN2B and MTAP), and 10q26qter (MGMT and EBF3) may play an important role in prognosis. In addition, we describe the MFt genomic instability profile. Forty-one MFt were studied by arrayCGH using the Human Genome CGH 44K microarrays (G4410B and G4426B, Agilent Technologies, Palo Alto, CA, USA). In each microarray experiment, DNA obtained from a 20x10 um sections snap frozen samples from tumoral MF lesions was compared with commercial pools of healthy female DNA (Promega, Madison, WI, USA).

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Phototherapy restores deficient type I interferon production and enhances antitumor responses in mycosis fungoides [I]

Project description:NanoString based gene expression data from skin biopsies from nine mycosis fungoides patients before and after phototherapy as well as four healthy donor skin as a comparator

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