Cutaneous T-Cell Lymphoma
- Author: Robert A Schwartz, MD, MPH; Chief Editor: Dirk M Elston, MD more...
Background
Cutaneous T-cell lymphomas (CTCLs) are the largest group of cutaneous lymphomas, representing 65% of all cutaneous lymphomas. The World Health Organization (WHO)/European Organization for Research and Treatment of Cancer (EORTC) classification (WHO-EORTC classification) is used to categorize CTCLs.[1, 2, 3] However, a substantial subset of T-cell primary cutaneous lymphomas remains that cannot be classified beyond the unspecified peripheral T-cell category, some of which may have an aggressive course.[4]
Note the clinical images below.
Tumor-stage cutaneous T-cell lymphoma.
Middle-aged woman with mycosis fungoides showing ulceration and marked depigmentation of advanced disease. Mature T-cell and natural killer (NK) cell neoplasms according to the WHO-EORTC classification are as follows:
- Mycosis fungoides (MF): - Variants of MF (pagetoid reticulosis [localized disease], follicular, syringotropic, granulomatous variant), subtype of MF (ie, granulomatous slack skin (GSS) syndrome)
- Sézary syndrome
- CD30+ T-cell lymphoproliferative disorders of the skin - Lymphomatoid papulosis, primary cutaneous anaplastic large cell lymphoma
- Subcutaneous panniculitislike T-cell lymphoma
- Primary cutaneous peripheral T-cell lymphoma (PTL), unspecified - Subtypes of PTL (primary cutaneous aggressive epidermotropic CD8+ T-cell lymphoma [provisional], cutaneous gamma/delta-positive T-cell lymphoma (CGD-TCL) [provisional], primary cutaneous CD4+ small/medium-sized pleomorphic T-cell lymphoma [provisional])
- Extranodal NK/T-cell lymphoma, nasal type - Variant (hydroa vacciniformialike lymphoma)
- Adult T-cell leukemia/lymphoma
- Angioimmunoblastic T-cell lymphoma
CTCL, most commonly seen as MF, is a relatively common clonal expansion of T helper cells and, more rarely, T suppressor/killer cells or NK cells, that usually appears as a widespread, chronic, cutaneous eruption. MF itself is often an epidermotropic disorder characterized by evolution of patches into plaques and tumors composed of small- to medium-sized skin-homing T cells, some (or, rarely, all) of which have convoluted, cerebriform nuclei.
Pagetoid reticulosis is a variant of MF and is characterized by the presence of localized patches or plaques with an intraepidermal proliferation of neoplastic T cells. The term pagetoid reticulosis should be restricted to the localized type (Woringer-Kolopp type) and should not be used to describe the disseminated type (Ketron-Goodman type). Generalized cases should probably be classified as aggressive epidermotropic CD8+ CTCL, CGD-TCL, or tumor-stage MF.[5]
GSS syndrome is a rare subtype of CTCL characterized by the slow development of folds of lax skin in the major skin folds and, histologically, by an infiltrate of clonal T cells, with exceptionally large multinucleated giant cells sometimes showing inclusion of fragmented elastic fibers. Granulomatous CTCLs are rare, so limited data on the clinicopathological and prognostic features are available.[6] Patients with granulomatous MF and GSS display overlapping histologic features and differ clinically by the development of bulky skin folds in GSS.
Sézary syndrome (SS) has been defined historically by the triad of erythroderma, generalized lymphadenopathy, and the presence of neoplastic T cells (Sézary cells) in skin, lymph nodes, and peripheral blood. Some authorities believe the diagnosis of SS should include one or more of the following[7] :
- An absolute Sézary cell count of least 1000/µL
- Demonstration of immunophenotypical abnormalities (an expanded CD4+ T-cell population resulting in a CD4/CD8 ratio of more than 10:1; loss of any or all of the T-cell antigens CD2, CD3, CD4, CD5; or loss of both CD4 and CD5)
- Demonstration of a T-cell clone in the peripheral blood by molecular or cytogenetic methods
SS is an erythrodermic CTCL. Demonstration of a T-cell clone (preferably of the same T-cell clone in skin and peripheral blood) in combination with one of the aforementioned cytomorphological or immunophenotypical criteria has been suggested as minimal criteria for the diagnosis of SS, in order to exclude patients with benign inflammatory conditions simulating SS.
Adult T-cell leukemia/lymphoma (ATLL) is an aggressive T-cell neoplasm etiologically linked with the human T-cell leukemia virus 1 (HTLV-1). Cutaneous lesions are usually a manifestation of widely disseminated disease, although a slowly progressive form that may only involve the skin may occur.[8]
Subcutaneous panniculitislike T-cell lymphoma (SPTL) is a cytotoxic T-cell lymphoma characterized by the presence of primarily subcutaneous infiltrates of small, medium, or large pleomorphic T cells and many macrophages, predominantly affecting the legs and often complicated by a hemophagocytic syndrome.[9] At least 2 groups of SPTL with different histologies, phenotypes, and prognoses can be distinguished. Cases with an alpha/beta-positive T-cell phenotype are usually CD8+, are restricted to the subcutaneous tissue (with no dermal or epidermal involvement), and tend to run an indolent clinical course.[10, 11] The SPTL designation is only used for patients with an alpha/beta-positive T-cell phenotype, whereas those with a gamma/delta T-cell phenotype are now categorized as having CGD-TCL.[1, 2, 3, 11, 12]
Extranodal NK/T-cell lymphoma, nasal type, is an Epstein-Barr virus (EBV)–positive lymphoma of small, medium, or large cells, usually with an NK-cell, or, more rarely, a cytotoxic T-cell phenotype. The skin is the second most common site of involvement, with the nasal cavity/nasopharynx being the most common and the reason why it was once known as a lethal midline granuloma. Cutaneous involvement may be primary or secondary. Because both primary and secondary involvement are clinically aggressive and require the same type of treatment, distinction between the 2 cutaneous involvements seems unnecessary.[11, 13, 14]
Primary cutaneous PTL, type unspecified, is the designation for CTCLs that do not fit into any of the better-defined subtypes of CTCL.[1, 2, 3] These include the 3 provisional entities described below, because primary cutaneous aggressive epidermotropic CD8+ cytotoxic T-cell lymphoma, CGD-TCL, and primary cutaneous small-medium CD4+ T-cell lymphoma can be separated out as provisional entities. The remaining diseases that do not fit into any of the better-defined subtypes of CTCL are characterized as follows:
- Primary cutaneous aggressive epidermotropic CD8+ cytotoxic T-cell lymphoma, a provisional entity, is characterized by a proliferation of epidermotropic CD8+ cytotoxic T cells and aggressive clinical behavior.[5]
- CGD-TCL is composed of a clonal proliferation of mature, activated gamma/delta T cells with a cytotoxic phenotype.[12, 15, 16] It may be primary or secondary cutaneous lymphoma.
- Primary cutaneous CD4+ small/medium-sized pleomorphic T-cell lymphoma is the diagnosis used when a predominance of small- to medium-sized CD4+ pleomorphic T cells are present without a history of patches and plaques typical of MF.[17]
For additional information from other eMedicine articles, see T-Cell Disorders, Mycosis Fungoides, and Lymphoma, Cutaneous T-Cell.
Pathophysiology
The primary pathophysiologic mechanisms for the development of cutaneous T-cell lymphoma (CTCL) (ie, mycosis fungoides [MF]) have not been elucidated. MF may be preceded by a T-cell–mediated chronic inflammatory skin disease, which may occasionally progress to a fatal lymphoma. Karyotypic analysis of cutaneous and blood lymphocytes has shown several genetically aberrant T-cell clones in the same patient.
A genotraumatic T cell is one with a tendency to develop numerous clonal chromosomal aberrations. Normal T lymphocytes show apoptosis during in vitro culturing, whereas genotraumatic ones have the ability to develop clonal chromosomal aberrations to become immortalized. This concept implies genetic instability followed by T-cell proliferation. Successive cell divisions of a genotraumatic T-cell clone may produce multiple and complex chromosomal aberrations. Some may reprogram the genotraumatic cells to apoptosis, whereas one or more may produce the phenotypic alterations of malignancy if not eliminated in vivo.
Thus, one hypothesis is that the development of genotraumatic T lymphocytes is involved in the etiopathogenesis and the progression of MF. It would also predict that each patient would likely have a unique malignant clone, which, in fact, has been found to be the case.
CTCL is a group of T-cell proliferative disorders. Primary cutaneous lymphomas require distinction from histologically similar primary nodal ones because their clinical behavior, prognosis, and therapy are often different. In addition, a difference often exists between primary cutaneous and nodal lymphomas in the presence of specific translocations.
Epidemiology
Frequency
United States
The incidence of cutaneous T-cell lymphoma (CTCL) is approximately 5 cases per million population per year.
International
Cutaneous T-cell lymphomas (CTCLs) account for 65% of cutaneous lymphomas. CTCLs have a worldwide distribution, with no well-identified increase in prevalence in any region. Some studies have identified an increase in prevalence in industrial populations (eg, among workers who use machine cutting oils). ATLL is endemic in areas with a high prevalence of HTLV-1 infection, such as southwest Japan, the Caribbean islands, South America, and parts of Central Africa. ATLL occurs in 1-5% of seropositive individuals after more than 2 decades of viral persistence.[8] Nasal NK/T-cell lymphoma, which is associated with EBV infection, is more common in Asia, Central America, and South America.
In the dermatology center of Professor Alsaleh in Kuwait, Arab males with MF outnumbered females by a 2:1 ratio.[18] The annual incidence rate in Kuwait was 0.43 case per 100,000 persons; this was found to be significantly higher among Arabs compared with non-Arab Asians.
Race
In the United States, cutaneous T-cell lymphoma (CTCL) is more common among Americans of sub-Saharan African lineage than those of European background, in a ratio of approximately 2:1.
Sex
Cutaneous T-cell lymphoma (CTCL) is more common in men in a ratio of approximately 2:1.
Age
Most patients with cutaneous T-cell lymphoma (CTCL) are middle-aged or elderly. Many patients have had a poorly defined form of dermatitis for many years prior to the onset of CTCL. In a significant proportion of cases, the onset of the disease, or of a dermatitic precursor of the disease, occurred in childhood. CTCL starting in children younger than 10 years is exceedingly rare and does not show a male predominance; one series even reported a strong female predilection. Similar to adult patients, however, most children present in stage IA or IB and have a good-to-excellent prognosis with treatment, although cases progressing to plaque, tumor-stage disease, and death have been reported. Some patients with limited MF are described as having Woringer-Kolopp–type pagetoid reticulosis. These patients are usually middle-aged, with an age distribution in one series ranging from 13-68 years and a mean age of 55 years.
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| Stage | Skin Lesions | Lymphadenopathy | Erythroderma | Histological Lymphoma | |||
| Patches < 10% | Plaques ³10% | Tumors | Lymph Nodes | Viscera | |||
| IA | + | - | - | - | - | - | - |
| IB | + or - | + | - | - | - | - | - |
| IIA | + or - | + or - | + or - | + | - | - | - |
| IIB | + or - | + or - | + | + or - | - | - | - |
| III | + or - | + or - | + or - | + or - | + | - | - |
| IVA | + or - | + or - | + or - | + or - | + or - | + | - |
| IVB | + or - | + or - | + or - | + or - | + or - | + or - | + |
| Stage Class | Stage | Definition |
| T (Tumor) | T1 | Patches/plaques involving < 10% of body surface |
| T2 | Patches/plaques involving ³10% of body surface | |
| T3 | Tumor(s) present on skin | |
| T4 | Erythroderma | |
| N (Nodes) | N0 | No enlarged lymph node present |
| N1 | Enlarged lymph nodes, histologically uninvolved | |
| N2 | No enlarged lymph node; one or more nodes histologically involved* | |
| N3 | Enlarged lymph nodes, histologically involved | |
| M (Metastasis to viscera) | M0 | No visceral lesion present |
| M1 | Visceral involvement | |
| B (Blood involvement) | B0 | Circulating atypical lymphocytes (Sézary cells) £5% of lymphocytes |
| B1 | Circulating atypical lymphocytes ³5% of lymphocytes (Sézary syndrome) | |
| *Uncommon finding, usually not considered/investigated. | ||
| Clinical Stage | TNM (B) Stage | |||
| IA | T1 N0 M0 | |||
| IIB | T2 N0 M0 | |||
| IIA | T1 N1 M0 | T2 N1 M0 | ||
| IIB | T3 N0 M0 | T3 N1 M0 | ||
| III | T4 N0 M0 | T4 N1 M0 | ||
| IVA | T1 N2 M0 | T2 N2 M0 | T3 N2 M0 | T4 N2 M0 |
| T1 N3 M0 | T2 N3 M0 | T3 N3 M0 | T4 N3 M0 | |
| IVB | T1 N0 M1 | T2 N0 M1 | T3 N0 M1 | T4 N0 M1 |
| T1 N1 M1 | T2 N1 M1 | T3 N1 M1 | T4 N1 M1 | |
| T1 N2 M1 | T2 N2 M1 | T3 N2 M1 | T4 N2 M1 | |
| T1 N3 M1 | T2 N3 M1 | T3 N3 M1 | T4 N3 M1 | |

