Gamma-delta T-cell Lymphoma Research Articles

Primary cutaneous lymphomas in patients with chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL): A series of 12 cases

Chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL) is associated with an increased risk of a second malignancy. We conducted a retrospective clinicopathologic review of 12 patients with CLL/SLL who developed a second lymphoma in the skin. Demographic data, clinical information, and histopathology from 31 biopsies were recorded. Cases of secondary cutaneous involvement by CLL/SLL (leukemia cutis) and non-primary cutaneous lymphomas were excluded. A wide variety of primary cutaneous lymphomas was identified, including classic mycosis fungoides (3), cutaneous marginal zone lymphoma (2), primary cutaneous peripheral T-cell lymphoma unspecified (2), folliculotropic mycosis fungoides (1), Sézary syndrome (1), cutaneous gamma-delta T-cell lymphoma (1), cutaneous CD8+ aggressive epidermotropic cytotoxic T-cell lymphoma (1), and cutaneous anaplastic large cell lymphoma (1). A male predominance was observed, and the average age was 74.1 years. In all patients, CLL/SLL predated the development of the second lymphoma, which was aggressive in the majority of cases (58%). Aggressive cytotoxic T-cell lymphomas, generally rare neoplasms, were relatively common (30%). CLL/SLL patients may develop a second lymphoma in the skin, which may be aggressive. Atypical cutaneous lymphoid infiltrates in this patient population should not be assumed to represent secondary CLL/SLL involvement and require thorough immunohistochemical analysis.

Primary cutaneous gamma-delta T-cell lymphoma: Two cases and a review of the literature

Background: Primary cutaneous gamma delta T cell lymphoma (PCGD TCL) is a rare and rapidly progressive cutaneous malignancy that can be diagnostically challenging. Purpose: To improve characterization of the clinical and histologic features of PCGD-TCL. Methods: We present two patients with PCGD TCL and review an additional 97 PCGD TCL cases from the English literature. Results: A 51 year old male with biopsy proven psoriasis and a previously healthy 31 year old male with vitiligo developed PCGD-TCL. Initial biopsy specimens in both patients suggested tumor stage mycosis fungoides (MF), but subsequent histopathology confirmed PCGD TCL. Ninety-seven patients were identified in the literature, mostly males (53%) with a mean age of 55.2 years. Lesions most commonly involved the lower (60%) and upper (30%) extremities and existed a mean of 26 months before diagnosis. The most common immunohistochemical markers were EBV(-), CD3(+), CD4(-), CD5(-), CD7(-), CD8(-), CD30(-), CD56(+), granzyme-B(+), perforin(+), and βF1(-). Radiation and CHOP chemotherapy were the most common interventions and 52% of patients died. Conclusion: PCGD TCL is a devastating disease that can clinically and histologically mimic more common dermatologic conditions, such as psoriasis and MF, and its diagnosis may require multiple biopsies and review by a multi specialty pathology team.

The diagnostic value of flow cytometry in patients with lymphoma associated hemophagocytic syndrome

Objective: To evaluate the reliability of flow cytometry (FCM) for diagnosing lymphoma associated hemophagocytic syndrome (LAHS). Method: The clinical data in 57 patients with hemophagocytic lymphohistiocytosis (HLH)were retrospective analyzed at Peking University Shenzhen Hospital from July 2010 to July 2019. All patients were performed bone marrow FCM and bone marrow pathological examination before final diagnoses were made. The golden diagnosis criterion was based on clinical, biochemical and histopathological evidence, which was regarded as the standard to evaluate the sensitivity and specificity of FCM analysis in diagnosing LAHS. Results: Among 57 cases, 36 cases were eventually diagnosed with LAHS, including 15 B-cell lymphoma(14 diffuse large B-cell lymphoma, 1 B-cell lymphoma with reactive T-cell hyperplasia), 13 aggressive NK/T cell lymphoma/leukemia, 2 cases of gamma-delta T-cell lymphoma, 4 angioimmunoblastic T-cell lymphoma, 1 enteropathy-associated peripheral T-cell lymphoma and 1 anaplastic T-cell lymphoma. Lymphoma cells in bone marrow were detected in all patients by FCM except one ENTCL patient. The sensitivity and the specificity of FCM in LASH compared to bone marrow biopsy were 97.2%(P=0.014)and 90.5%(P=0.488) respectively. In the other 21 non-LAHS patients, T cell receptor Vβ (TCRVβ) rearrangement was detected in 2 patients with Epstein-Barr virus (EBV) associated primary HLH. Conclusions: FCM effectively detects lymphoma cells in bone marrow of lymphoma patients with LHL, suggesting that FCM could be an important indicator for the diagnosis of LAHS. FCM also has the advantage in differentiating LAHS from other HLH.

Comparative Transcriptomics of Alpha-Beta Subcutaneous Panniculitis-like T-Cell Lymphoma and Primary Cutaneous Gamma Delta T-Cell Lymphoma

Background: Subcutaneous lymphomas are a heterogeneous group of diseases with variable clinical behavior that ranges from a lymphoproliferative disorder to an aggressive cytotoxic lymphoma. Subcutaneous panniculitis-like T-cell lymphoma (SPTCL) is an uncommon, often indolent cutaneous lymphoma that localizes to the subcutaneous adipose tissue. These tumors exhibit an alpha/beta phenotype (abSPTCL). Primary cutaneous gamma-delta T-cell lymphoma (PCgdTCL) is a rare, highly aggressive lymphoma that frequently involves the subcutaneous adipose tissue. The goal of this study is to identify key inflammatory and oncogenic pathways in SPTCL and PCgdTCL to determine which mutational or expression patterns differentiate abSPTCL and PCgdTCL. A comprehensive catalog of cancer gene expression profiles generated via RNA sequencing on patient samples is essential to understand tumorigenesis and to develop effective therapies. Methods: We performed transcriptomic profiling analysis using RNA sequencing in lesional skin biopsies from patients of abSPTCL (n=10), PCgdTCL (n=9), and controls (n=5). Differential analyses were performed on the entire transcriptomic profiles among the 3 groups. Results: Although the transcriptomic profiles of abSPTCL and PCgdTCL samples had similarities, there were notable differences between these groups that may elucidate unique pathways that propagate each disease. In contrast to abSPTCL, PCgdTCL samples demonstrated upregulation of cell motility and proliferation, and downregulation of pathways involving apoptosis and tumor necrosis factor production. The most significantly upregulated gene pathways in both abSPTCL and PCgdTCL samples were those involving immune and inflammatory response, viral defense, type I interferon signaling, interferon-gamma-mediated signaling, and positive regulation of T cell proliferation. The most significantly downregulated gene pathways in the two groups were those involving cell adhesion, rRNA processing and translation, and extracellular matrix organization. The top 5 upregulated immune response and downregulated cell adhesion hub genes for abSPTCL highlighted by gene interaction network analysis included: TNF, CTLA4, CD86, IL10, CCR5 & ITGB5, ITGA8, VWF, APP, CDH5, respectively. Conclusion: Our transcriptomic profiling pinpoints disease-related enrichment pathways and gene functions in abSPTCL and PCgdTCL patients, which may shed light on molecular mechanisms that drive disease activity. Hub genes in abSPTCL represent potential drug targets for further development of novel therapies. Disclosures Mangold: Kirin:Membership on an entity's Board of Directors or advisory committees;Elorac:Research Funding;Sun Pharma:Research Funding;MiRagen:Research Funding;Solagenix:Research Funding.

Molecular pathogenesis of cutaneous lymphoma-Future directions.

The pathogenesis of cutaneous T-cell lymphomas is not clear. In recent years, the genetic changes in CTCL were explored. The detected mutations showed a great deal of heterogeneity between individual patients. The studies documented various copy number variations (CNV) and single nucleotide variations (SNV) in multiple genes involved in multiple signalling pathways. Recurrently mutated signalling pathways include JAK-STAT, MAPK, T-cell receptor, TNF receptor and NFκB signalling. In the period between 2018 and today, additional studies towards the genetic changes in CTCL were carried out. Genetic changes in gamma delta T-cell lymphoma are also shown in genes of the JAK-STAT, MAPK, MYC and chromatin signalling pathways. These studies might indicate a shift away from targeted sequencing approaches towards whole-genome sequencing. This approach demands additional resources in terms of funding but has the advantage of finding mutations in non-coding regions. These mutations were neglected for a long time, but as shown in contemporary research these regions harbour highly recurrent mutations affecting gene expression and regulation. Nevertheless, the detection of specific molecular changes in known pathways enables considerations for targeted therapies.

Hepatosplenic Gamma Delta T-cell Lymphoma Presenting as Progressive Hepatosplenomegaly Highlighted during Pregnancy

Hepatosplenic T-cell lymphoma (HSGDTL) is a rare variant of T-cell lymphoma with few reported cases in literature. It usually presents with hepatosplenomegaly and constitutional symptoms, primarily in young to middle aged patients. The prognosis is generally poor, with maximum reported survival periods of 2-3 years. There is a link to immunodeficiency and some biological treatments. Liver biopsy with flow cytometry is required to confirm the diagnosis.

Long Term Outcomes of Patients with Aggressive T-Cell Non-Hodgkin Lymphoma Undergoing Allogeneic Stem Cell Transplantation: Retrospective Results from a Single Center

Background: Mature T cell and NK cell neoplasms collectively known as peripheral T-cell lymphomas (PTCL) comprise 15-20% of Non-Hodgkin lymphomas in adults and have a poor prognosis with a 5-year survival of less than 30% for the most aggressive subtypes. Allogeneic HCT (allo-HCT) is offered to eligible patients as a potentially curative modality in the salvage setting or in high risk patients to consolidate an initial response to frontline therapy. There are few studies that report clinical outcomes derived from large sample size and long-term follow up data. Methods: We retrospectively reviewed medical records of 87 consecutive patients with PTCL including transformed mycosis fungoides and NK/T-cell lymphoma without prior autologous transplant who underwent allo-HCT at City of Hope from January 2000 to June 2018 after IRB approval was obtained. Descriptive statistics were used to summarize baseline patient demographic, treatment, and disease characteristics. Kaplan-Meier curves and the log-rank test were used to evaluate the overall survival (OS) and progression-free survival (PFS). Cumulative incidences of time to relapse and time to non-relapse mortality (NRM) were calculated with relapse and NRM as competing risks. Cumulative incidences of acute and chronic GVHD were calculated as time to onset of GVHD with relapse and death as competing events for GVHD. Results: 87 patients were included for the analysis. Median age at the time of allo-HCT was 49 years (range 2-70 years). Histologies were PTCL-NOS (n=21); transformed CTCL (n=19); NK T-cell lymphoma (n=17); AITL (n=15), ALCL (n=7); gamma delta T-cell lymphoma (n=6) and other rare subtypes (n=2). None of the patients had a prior auto transplant. 42 patients (48%) received myeloablative conditioning, with the majority of patients receiving FTBI based conditioning (n=39) and three patients received BEAM regimen for conditioning. 45 patients (52%) received reduced intensity conditioning; fludarabine/melphalan based-conditioning was the most common regimen used (n=39). Sibling HCT was performed in 47 patients (54%), while MUD HCT was performed in 36 patients (41%) with fully matched HLA unrelated donor in 15 (17%) and HLA mismatched in 21 (24%) patients; 4 (5%) received haploidentical HCT. GVHD prophylaxis consisted of tacrolimus/sirolimus (n=54), tacrolimus/sirolimus/MTX (n=11), tacrolimus or cyclosporine/MTX (n=7), tacrolimus or cyclosporine/MMF (n=7), post-transplant cyclophosphamide/tacrolimus/MMF (n=5) and other (n=3). Source of stem cells was PBSC in 77 (88%), bone marrow in 5 (6%), and cord blood in 5 (6%) patients. At the time of allo-HCT, there were a total of 25 (29%) patients in complete remission (CR1 n=15, CR2+ n=10), 25 (29%) patients in partial remission 22 (25%) with induction failure and 14 (16%) with relapsed disease. The median follow-up among survivors was 6.9 years (range 1.1-15.5). The 5- and 10-year PFS was 47% (95% CI: 36%-58%) and 38% (95% CI: 26%-50%), respectively. The 5- and 10-year OS was 53% (95% CI: 41%-63%) and 42% (95% CI: 29%-54%), respectively (Fig.1). Relapses at 5 and 10 years were both 24% (95% CI: 16%-34%), while NRM at 5 and 10 years was 28% (95% CI: 19%-39%) and 37% (95% CI: 25%-50%), respectively. At day 100 after allo-HCT, the rates of acute GVHD grade II-IV were 41% (95% CI: 30%-51%) and grade III-IV of 16% (95%CI: 9%-25%). Chronic GVHD rates at 3 years were 62% (95% CI: 51%-72%), with extensive GVHD of 55% (95% CI: 44%-65%). On univariate analysis, age (> 60 or not), sex, TBI-based conditioning, donor type (MSD vs MUD), stem cell source or remission status prior to allo-HCT did not predict for overall survival in our study. Conclusions: Our results constitute the largest reported single-institution series with a long-term follow-up on allo-HCT outcomes in patients with aggressive T-cell NHL. The 5-year PFS and OS of 47 and 53%, respectively, are encouraging for the high-risk T-cell NHL patients with limited treatment options. Disclosures Salhotra: Celgene: Other: Research Support; Kadmon Corporation: Other: Non paid consultant. Popplewell:City of Hope: Employment. Herrera:Adaptive Biotechnologies: Consultancy; Bristol-Myers Squibb: Consultancy, Research Funding; Gilead Sciences: Consultancy, Research Funding; Seattle Genetics: Consultancy, Research Funding; AstraZeneca: Research Funding; Merck: Consultancy, Research Funding; Genentech, Inc.: Consultancy, Research Funding; Pharmacyclics: Research Funding; Immune Design: Research Funding; Kite Pharma: Consultancy, Research Funding. Mei:Seattle Genetics, Inc.: Research Funding. Zain:spectrum: Honoraria; Seattle Genetics: Honoraria, Speakers Bureau.

STAT3 Mutations and Anemia with Pure Red Cell Aplasia Are the Distinctive Features of T Cell Receptor Gamma Delta Type Large Granular Lymphocyte Leukemia

Large granular lymphocytic leukemia (LGLL) is a heterogenous group of disorders. The clinical presentations of LGLL are highly variable; it may present with neutropenia or anemia, complicated with recurrent infections, autoimmune diseases such as rheumatoid arthritis, and neurological symptoms, requiring therapeutic interventions. It may present only with indolent laboratory changes without any symptoms. The cytological phenotypes of LGLL also vary and they commonly include CD8+TCR αβ-type, CD4+TCR αβ-type, and NK cell-type. NK cell-type LGLL is designated as chronic lymphoproliferative disorder of NK cells (CLPD-NK). TCR γδ-type LGLL (γδT-LGLL) is even rarer and it often confers cytopenia. The genetic backgrounds of LGLL with CD8+TCRαβ-type, CD4+TCRαβ-type and NK cell-type have been elucidated with the recent sequencing technologies. JAK/STAT signaling genes and chromatin-modifying genes were frequently mutated in the non-leukemic counterpart of the lymphoid malignancies with γδ TCR immunophenotypes, such as hepatosplenic T-cell lymphoma, monomorphic epitheliotropic intestinal T-cell lymphoma and primary cutaneous gamma delta T-cell lymphoma. However, the genetic basis of γδT-LGLL and the genetic-phenotypic associations remain unclear. The aim of this study is to identify clinical and genetic characteristics of γδT-LGLL in comparison with other LGL leukemias. In total, 56 LGLL patients were recruited; six patients with γδT-LGLL, 25 CD8+ TCRαβ type, 8 CD4+TCR αβ type and 17 CLPD-NK, in this study. All cases were negative for EBV. The median age of patients with γδT-LGLL was 48 years old and five of them were male. The median LGL counts and hemoglobin level were 1.81 ×109/L (range; 0.60-4.42) and 5.8 g/dL (range; 3.0-11.2), respectively. All patients with γδT-LGLL had anemia and/or neutropenia, although no patients were thrombocytopenic. 4 patients presented with pure red cell aplasia. Common immunophenotypes of γδT cells were CD2+ CD3+ CD4-CD7+. 3 patients were CD8+. CD16, CD56 and CD57 were positive in 3, 0, and 1 patient, respectively. γδT cells of all patients showed a monoclonal pattern of TCRγ gene rearrangements with BioMed 2 protocol. We performed amplicon sequencing of entire coding regions of STAT3, STAT5B and TNFAIP3 genes and allele-specific PCR for several hot spot regions of STAT3 and STAT5B genes using extracted DNA from mononuclear cells of peripheral blood. Mutations in STAT3 and TNFAIP3 were identified in 100% (6/6) and 17% (1/6), respectively. Among the10 STAT3 mutations identified, 5 were located in the SH-2 domain, while other 3 were in coiled-coiled domain and the other 2 were in the DNA binding domain. The median variant allele frequencies of STAT3 was 2.0% (0.7-22.6) and STAT3 mutations were restricted to sorted γδT cells in all 3 patients examined. No patient was positive for STAT5B mutations, including N642H and Y665F with allele specific PCRs. One of 5 patients who were treated with cyclosporin A was refractory. Two patients were treated with cyclophosphamide, showing clinical improvements. The patients with γδT-LGLL were younger than those with other types of LGLL (P=0.048) and anemia and STAT3 mutations were significantly more frequent in γδT-LGLL (P value; 0.003 and 0.02, respectively). PRCA was a consistent cause of anemia in γδT-LGLL. Low frequency of STAT5B mutations among γδT-LGLL patients was in contrast to other aggressive γδT cell lymphoma in which STAT5B frequently mutated. The clinical characteristics of γδT-LGLL patients may be defined by younger age and the anemia due to pure red cell aplasia, and the frequent STAT3 mutations might be a novel molecular marker for γδT-LGLL. Disclosures Yamane: Pfizer: Research Funding; Celgene: Honoraria; Bristol-Meyers Squibb: Research Funding; Chugai Pharmaceutical: Consultancy, Research Funding; Astellas Pharma: Research Funding; Eli Lily and Company: Research Funding. Ishida:Eli Lily and Company: Research Funding; Astellas Pharma: Research Funding; Pfizer: Research Funding; Bristol-Meyers Squibb: Research Funding; Chugai Pharmaceutical: Consultancy, Research Funding; Celgene: Honoraria.

Clinicopathological Features and Outcomes in Lymphoma of Extraocular Muscles.

To describe the clinicopathological features and report the outcomes of treatment in lymphoma involving the extraocular muscles (EOM), the largest reported case-series. A retrospective case series of patients with lymphoma involving the EOM from a single tertiary referral orbital center, between March 1992 and March 2018. Patients with other histopathologic diagnoses or who did not have an EOM biopsy were excluded. The main outcome measures were histologic evaluation and clinical follow-up including tumor response, recurrence, and survival. Twenty-five patients were included, 16 female; 9 male; median age 64.7 years (range 33.8-92.6 years). Unilateral involvement was present in 23 cases (92%). Lymphoma was found to be primary in 15 patients (60%), and any EOM could be affected by disease. Fourteen patients (56%) displayed impaired duction in the direction of the affected muscle. The commonest histologic type was extranodal marginal zone lymphoma of mucosa-associated lymphoid tissue in 16 cases (64%) followed by follicular lymphoma in 3 cases (12%), diffuse large B-cell lymphoma in 2 cases (8%), gamma delta T-cell lymphoma in 2 cases (8%), small lymphocytic lymphom and lymphoplasmacytic lymphoma in 1 case each (4%). All 4 patients with high-grade lymphomas (diffuse large B-cell or T cell lymphoma) were found to have systemic disease. Patients were treated with combinations of radiotherapy, chemotherapy, or immunotherapy, with low toxicity. Two patients developed treatment-related complications. With a median follow-up of 26 months (range 3-108 months), there was only 1 recurrence, which was successfully salvaged with Rituximab, and no deaths due to lymphoma. Lymphoma of the EOM is a rare tumor with good response to treatment, few treatment-related complications and low risk of recurrence or mortality.A retrospective review of 25 patients with lymphoma of the extraocular muscles demonstrates excellent prognosis with a high rate of local remission (96%), 2 treatment-related complications, one recurrence, and no disease-related deaths.

Primary cutaneous gamma-delta T-cell lymphoma masquerading as severe soft tissue infection

N/A- Case report

Histopathological Features of Gamma-delta T-cell Lymphoma in Two Cows

Histopathological Features of Gamma-delta T-cell Lymphoma in Two Cows

Volumetric Modulated Arc Therapy and 3-Dimensional Printed Bolus in the Treatment of Refractory Primary Cutaneous Gamma Delta Lymphoma of the Bilateral Legs

Primary cutaneous gamma-delta T-cell lymphoma (PCGDTL) is an aggressive subtype that comprises <1% of cutaneous T-cell lymphomas. 1 Guitart J. Weisenburger D.D. Subtil A. et al. Cutaneous γδ T-cell lymphomas: A spectrum of presentations with overlap with other cytotoxic lymphomas. Am J Surg Pathol. 2012; 36: 1656-1665 Google Scholar , 2 Phan A. Veldman R. Lechowicz M.J. T-cell lymphoma epidemiology: The known and unknown. Curr Hematol Malig Rep. 2016; 11: 492-503 Google Scholar , 3 Foppoli M. Ferreri A.J.M. Gamma-delta t-cell lymphomas. Eur J Haematol. 2015; 94: 206-218 Google Scholar Deep dermal and subcutaneous lesions are common and may be necrotic or ulcerated. 4 Tripodo C. Iannitto E. Florena A.M. et al. Gamma-delta T-cell lymphomas. Nat Rev Clin Oncol. 2009; 6: 707-717 Google Scholar Radiation therapy (RT) is an effective treatment for patients with localized PCGDTL, using doses from 30 to 36 Gy. However, RT poses a challenge for patients with widespread subcutaneous disease because irradiating the core of limbs increases the risk of lymphedema, vascular leakage, and fibrosis. 5 El-Bared N. Wong P. Wang D. Soft tissue sarcoma and radiation therapy advances, impact on toxicity. Curr Treat Options Oncol. 2015; 16: 19 Google Scholar Techniques such as total skin electron beam therapy do not adequately penetrate to the depth of subcutaneous PCGDTL lesions: degraded 9 MeV electrons, 80% dose at 0.7 cm, and 50% dose at 1.25 cm. 6 Hoppe R.T. Mycosis fungoides: Radiation therapy. Dermatol Ther. 2003; 16: 347-354 Google Scholar , 7 Chinn D.M. Chow S. Kim Y.H. Hoppe R.T. Total skin electron beam therapy with or without adjuvant topical nitrogen mustard or nitrogen mustard alone as initial treatment of T2 and T3 mycosis fungoides. Int J Radiat Oncol Biol Phys. 1999; 43: 951-958 Google Scholar Volumetric modulated arc therapy (VMAT), a form of intensity modulated radiation therapy, is an effective technique to treat circumferential surfaces while sparing the inner body. 8 Servy A. Kramkimel N. Franck N. Park S. Kirova Y.M. Helical tomotherapy in oncodermatology: Case report of circumferential cutaneous lymphoma treated by this optimized radiotherapy. Cancer Radiother. 2014; 18: 136-138 Google Scholar A reproducible bolus that covers extended irregular surfaces would simplify setup and minimize air gaps that can cause dosimetric distortion. We present a patient with extensive bilateral leg involvement with PCGDTL who achieved remission after treatment with VMAT, using 3-dimensional printed bolus and positioning to irradiate each leg individually.

Silent T-cell receptor cutaneous T-cell lymphoma associated to a clonal plasma cell proliferation.

Within T-cell lymphomas (TCL) there are 2 entities expressing gamma-delta TCR: hepatosplenic gamma-delta T-cell lymphoma (HSGDTL) and the primary cutaneous gamma-delta T-cell lymphoma (PCGDTL). PCGDTL is a rare form of Tcell lymphoma with specific tropism for skin that have a dismal prognosis. Although even rarer, there have been reports of TCL with loss of expression of the TCR, which have been termed peripheral TCL TCR-silent type. We report the case of a cutaneous TCR-silent type lymphoma associated to a clonal plasma cell proliferation with an ominous outcome that led to a lot of discussion in its classification. Due to the aggressiveness of the disease and the scant evidence about therapy in this strange entity the outcome was fatal. We report a unique case of a TCR-silent cutaneous TCL with an exceptional histopathology, prolonged clinical evolution and a subsequent plasma cell clonal expansion.

Primary Cutaneous Gamma Delta T Cell Lymphoma: A Clinicopathological Analysis

Primary cutaneous gamma-delta T-cell lymphoma (PCGD-TCL) is a very uncommon and extremely aggressive tumor, and is described in the newly re-vised World health organization for research and treatment of cancer classification of cutaneous lymphomas. A 43-year-old male patient presented with a 4 months history of cutaneous lesion over upper lip, without plaque and any constitutional symptom. Histopathological examination of skin biopsy revealed infiltration of atypical lymphocytes with hyperchromatic irregular nuclei. Immunophenotyping pattern of skin biopsy was compatible with PCGD-TLC. It is a highly aggressive tumor resistant to chemotherapy, immunotherapy, and radiation therapy. The GDTCL is characterized by a worse prognosis with a median survival of 15 months. Early diagnosis is essential and aggressive therapy is necessary.

Rare T-Cell Subtypes.

There are a number of rare T-cell lymphoma subtypes that may be encountered in clinical practice. In recent years, improved immunohistochemical techniques and molecular tumor profiling have permitted refinement of some of the diagnostic categories in this group, as well as the recognition of distinct conditions not previously well elucidated. In this chapter, we cover the diagnostic and clinical features of some of the more common of these conditions, including subcutaneous panniculitis-like T-cell lymphoma, cutaneous gamma-delta T-cell lymphoma, enteropathy-associated T-cell lymphoma, monomorphic epitheliotropic intestinal T-cell lymphoma, primary cutaneous CD8-positive aggressive epidermotropic cytotoxic T-cell lymphoma, CD4-positive small/medium T-cell lymphoproliferative disorder, and acral CD8-positive T-cell lymphoma. Given the rarity of these conditions, optimal treatments approaches are not always well established, not least as data from large-scale clinical trials are lacking. In this chapter, we aim to provide a summation of current thinking around best treatment, as well as highlighting some controversies in the management of these diagnoses.

Primary Peripheral Gamma Delta T-Cell Lymphoma of the Central Nervous System: Report of a Case Involving the Intramedullary Spinal Cord and Presenting with Myelopathy.

Primary central nervous system lymphoma of T-cell origin (T-PCNSL) is rare, and its clinicopathological features remain unclear. Peripheral T-cell lymphoma of γδ T-cell origin is an aggressive lymphoma mainly involving extranodal sites. Here, we report a case of γδ T-PCNSL involving the intramedullary spinal cord and presenting with paraplegia. A 75-year-old Korean woman visited the hospital complaining of back pain and lower extremity weakness. Magnetic resonance imaging revealed multifocal enhancing intramedullary nodular lesions in the thoracic and lumbar spinal cord. An enhancing nodular lesion was observed in the periventricular white matter of the lateral ventricle in the brain. There were no other abnormalities in systemic organs or skin. Laminectomy and tumor removal were performed. The tumor consisted of monomorphic, medium-to-large atypical lymphocytes with pale-to-eosinophilic cytoplasm. Immunohistochemically, the tumor cells were CD3(+), TCRβF1(-), TCRγ(+), CD30(-), CD4(-), CD8(-), CD56(+), TIA1(+), granzyme B(+), and CD103(+). Epstein-Barr virus in situ was negative. This case represents a unique T-PCNSL of γδ T-cell origin involving the spinal cord.

NK/T-cell lymphoma, nasal type, γδ T-cell lymphoma, and CD8-positive epidermotropic T-cell lymphoma-clinical and histopathologic features, differential diagnosis, and treatment.

The cytotoxic lymphomas of the skin constitute a heterogeneous group of rare lymphoproliferative diseases that are derived from mature T cells and natural killer (NK) cells that express cytotoxic molecules (T-cell intracellular antigen- 1, granzyme A/B, and perforin). Although frequently characterized by an aggressive course and poor prognosis, these diseases can have variable clinical behavior. This review delivers up-to-date information about the clinical presentation, histopathologic features, differential diagnosis, and therapy of extranodal NK/T-cell lymphoma, nasal type, primary cutaneous gamma delta T-cell lymphoma, and primary cutaneous CD8+ aggressive epidermotropic cytotoxic T-cell lymphoma.

181 A Rare and Aggressive Gamma-Delta (γδ) T-Cell Lymphoma, NOS Presenting as Heart Failure Without Leukocytosis: Clinicopathologic Course and Autopsy Findings

A 54-year-old man presenting with acute onset dyspnea on exertion in the absence of leukocytosis was found with global hypokinesis and 20%-25% EF on echocardiogram, consistent with systolic and diastolic heart failure. No evidence of obstructive CAD to support ischemic etiology was noted on catheterization. Microscopy of peripheral blood identified a population of medium to large lymphocytes with high nuclear/cytoplasmic ratios and convoluted, irregular nuclei. Flow cytometry showed a γδ T-cell population brightly expressing CD45 with intermediate forward and side scatter, CD2, CD3, and CD5 expression with loss of CD7, negative CD4 and CD8, upregulated CD57, and negativity of CD10, CD25, CD30, and CD56. A γδ T-cell lymphoproliferative disorder involving peripheral blood was suspected. Three main types include γδ T-cell large granular lymphocyte leukemia (T-LGL), which is indolent, whereas hepatosplenic γδ T-cell lymphoma (HSTCL) and mucocutaneous γδ T-cell lymphoma are aggressive. CD57 expression is specific for γδ T-cell LGL over the aggressive entities, which could suggest an indolent course; however, morphologic characteristics of γδT-cells differ from LGLs and are more suggestive of a lymphoma. Thoracentesis, liver and bone marrow biopsies found a γδ T-cell population identical to those in peripheral blood. A perisinusoidal and periportal pattern of liver involvement argued against HSTCL in which purely intrasinusoidal growth is typical. Expression of D5+, CD7–, CD56–, CD57+, TIA–, granzyme negative, and perforin-negative contrasts with that typical of HSTCL (CD5–, CD7+, CD56+, CD57–, TIA+, granzyme negative, and perforin negative). Also, HSTCL cases usually demonstrate isochromosome 7q, which was not seen in the patient’s lymphoma despite a complex karyotype. Following a rapidly fatal course, autopsy found virtually all body sites except the central nervous system were diffusely involved by γδ T-cell lymphoma of a rare immunophenotype not previously described. Infiltration of cardiac muscle provides a potential underlying etiology for the presenting symptoms of heart failure.

A Case of Mycosis Fungoides Occurring after Primary Gamma-Delta T-Cell Lymphoma

A Case of Mycosis Fungoides Occurring after Primary Gamma-Delta T-Cell Lymphoma

Gamma-delta (\u03b3\u03b4) T-cell lymphoma \u2013 another case unclassifiable by World Health Organization classification: a case report

BackgroundWe present a case of gamma-delta T-cell lymphoma that does not fit the current World Health Organization classifications.Case presentationA 74-year-old Caribbean-American woman presented with lymphocytosis, pruritus, and non-drenching night sweats. Bone marrow and peripheral blood analyses both confirmed the diagnosis of gamma-delta T-cell lymphoma. An axillary lymph node biopsy was negative for lymphoma. Clinically absent hepatosplenomegaly and skin lesions with biopsy-proven gamma-delta T-cell lymphoma suggest that she is unclassifiable within the current classification system.ConclusionsWe believe this is a case of not otherwise specified gamma-delta T-cell lymphoma. Accumulation of these rare not otherwise specified cases will be important for future classification which further defines the biology of this disease.