The diagnosis of Sézary syndrome (SS) relies on the identification of blood Sézary cells (SC) by different markers via flow cytometry. Treatment of SS is challenging since its pathogenesis is characterized by cell death resistance rather than hyperproliferation. In this study, we establish an integrated approach that considers both the expression of SC markers and sensitivity to cell death both spontaneously and upon in vitro treatment. Peripheral blood mononuclear cells were isolated from 20 SS patients and analysed for the SC markers CD7 and CD26 loss as well as CD158k and PD1 gain. The cells were then treated with different established and experimental therapies in vitro and cell death was measured. Spontaneous and therapeutically induced cell death were measured and correlated to cellular marker profiles. In the marker-positive cells, spontaneous cell death sensitivity was reduced. Different treatments in vitro managed to specifically induce cell death in the putative CTCL cell populations. Interestingly, a repeated analysis after 3 months of treatment revealed the CTCL cell death sensitivity to be restored by therapy. We propose this novel integrated approach comprising the evaluation of SC marker expression and analysis of cell death sensitivity upon treatment that can also enable a better therapy stratification.

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BACKGROUND: Mycosis fungoides (MF) is the most common type of cutaneous T cell lymphoma. As the early clinical manifestations of MF are non-specific (e.g., erythema or plaques), it is often misdiagnosed as inflammatory skin conditions (e.g., atopic dermatitis, psoriasis, and pityriasis rosea), resulting in delayed treatment. As there are no effective biological markers for the early detection and management of MF, the aim of the present study was to perform a proteomic analysis of urine samples (as a non-invasive protein source) to identify reliable MF biomarkers.
METHODS: Thirteen patients with early-stage MF were administered a subcutaneous injection of interferon α-2a in combination with phototherapy for 6 months. The urine proteome of patients with early-stage MF before and after treatment was compared against that of healthy controls by liquid chromatography-tandem mass spectrometry. The differentially expressed proteins were subjected to Gene Ontology, Kyoto Encyclopedia of Genes and Genomes, and Clusters of Orthologous Groups analyses. For validation, the levels of the selected proteins were evaluated by enzyme-linked immunosorbent assay (ELISA).
RESULTS: We identified 41 differentially expressed proteins (11 overexpressed and 30 underexpressed) between untreated MF patients and healthy control subjects. The proteins were mainly enriched in focal adhesion, endocytosis, and the PI3K-Akt, phospholipase D, MAPK, and calcium signaling pathways. The ELISA results confirmed that the urine levels of Serpin B5, epidermal growth factor (EGF), and Ras homologous gene family member A (RhoA) of untreated MF patients were significantly lower than those of healthy controls. After 6 months of treatment, however, there was no significant difference in the urine levels of Serpin B5, EGF, and RhoA between MF patients and healthy control subjects. The area under the receiver operating characteristic curve values for Serpin B5, EGF, and RhoA were 0.817, 0.900, and 0.933, respectively.
CONCLUSIONS: This study showed that urine proteomics represents a valuable tool for the study of MF, as well as identified potential new biomarkers (Serpin B5, EGF, and RhoA), which could be used in its diagnosis and management.

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Der CC‐Chemokinrezeptor‐4‐Antikörper Mogamulizumab ist zur Zweitlinientherapie der Mycosis fungoides und des Sézary‐Syndroms zugelassen. Zu den häufigsten Nebenwirkungen gehört der Mogamulizumab‐assoziierte Rash (MAR), der sich klinisch sowie histologisch vielgestaltig präsentieren kann. Rein klinisch ist der MAR häufig nicht von einem Progress der Grunderkrankung zu unterscheiden, weshalb der histologischen Untersuchung eine wegweisende Rolle, im Rahmen der klinisch‐pathologischen Korrelation, zukommt. In bisherigen Datenanalysen finden sich Hinweise, dass der MAR häufiger bei Patienten mit Sézary‐Syndrom auftritt und mit einem signifikant besseren Therapieansprechen einhergeht, weshalb die Abgrenzung von einem Krankheitsprogress besonders relevant ist. Die Behandlung des MAR erfolgt in Abhängigkeit vom Schweregrad, eine Pausierung der Therapie mit Mogamulizumab kann notwendig sein. Wir präsentieren drei Fälle aus unserer Klinik sowie den aktuellen Wissensstand der Literatur und möchten damit die hohe Relevanz der Kenntnis über den MAR im Management von Patienten mit kutanen Lymphomen aufzeigen.

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Mogamulizumab, a monoclonal antibody directed against CC chemokine receptor 4, is approved as a second-line treatment of mycosis fungoides and Sézary syndrome. One of the most common side effects is mogamulizumab-associated rash (MAR), which can present in a variety of clinical and histological types. Clinically, it can be difficult to differentiate between MAR and progression of the underlying disease, so histological examination is crucial for clinicopathological correlation. Current data analyses suggest that MAR is more common in patients with Sézary syndrome and is associated with a significantly better response to treatment, making the distinction from disease progression particularly important. The management of MAR depends on its severity, and therapy may need to be paused. This article presents three cases from our clinic and reviews the current literature on MAR. It emphasizes the importance of understanding MAR in the management of patients with cutaneous lymphomas.

BACKGROUND: The PROspective Cutaneous Lymphoma International Prognostic Index (PROCLIPI) study is aprospective analysis of an international database. Here we examine front-line treatments and quality of life (QoL) inpatients with newly diagnosed mycosis fungoides (MF).
OBJECTIVE: To identify (i) differences in first-line approaches according to tumour-nodes-metastasis-blood (TNMB)staging; (ii) parameters related to a first-line systemic approach and (iii) response rates and QoL measures.
METHODS: In total, 395 newly diagnosed patients with early-stage MF (stage IA-IIA) were recruited from 41 centresin 17 countries between 1 January 2015 and 31 December 2018 following central clinicopathological review.
RESULTS: The most common first-line therapy was skin-directed therapy (SDT) (322 cases, 81·5%), while a smallerpercentage (44 cases, 11·1%) received systemic therapy. Expectant observation was used in 7·3%. In univariateanalysis, the use of systemic therapy was significantly associated with higher clinical stage (IA, 6%; IB, 14%; IIA,20%; IA-IB vs. IIA, P < 0·001), presence of plaques (T1a/T2a, 5%; T1b/T2b, 17%; P < 0·001), higher modified Severity Weighted Assessment Tool (> 10, 15%; ≤ 10, 7%; P = 0·01) and folliculotropic MF (FMF) (24% vs. 12%, P = 0·001). Multivariate analysis demonstrated significant associations with the presence of plaques (T1b/T2b vs.T1a/T2a, odds ratio 3·07) and FMF (odds ratio 2·83). The overall response rate (ORR) to first-line SDT was 73%,while the ORR to first-line systemic treatments was lower (57%) (P = 0·027). Health-related QoL improvedsignificantly both in patients with responsive disease and in those with stable disease.
CONCLUSIONS: Disease characteristics such as presence of plaques and FMF influence physician treatment choices,and SDT was superior to systemic therapy even in patients with such disease characteristics. Consequently, futuretreatment guidelines for early-stage MF need to address these issues.