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Sézary Syndrome

Aggressive leukemic variant of cutaneous T-cell lymphoma characterized by triad of erythroderma, generalized lymphadenopathy, and circulating malignant Sézary cells in peripheral blood with median survival of 2-4 years.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

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This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Dermatoloji department. Book Appointment →

What is Sézary Syndrome?

Sézary syndrome (SS) is the leukemic, aggressive variant of cutaneous T-cell lymphoma (CTCL), constituting approximately 3-5% of all CTCL cases. It represents stage IVA1 of mycosis fungoides classification per ISCL/EORTC criteria.

Pathologically characterized by malignant CD4+ memory T-cells with cerebriform nuclei (Sézary cells) infiltrating skin, lymph nodes, and circulating in peripheral blood. Diagnosis requires Sézary cell count ≥1000/μL, CD4/CD8 ratio ≥10, or aberrant CD4+ T-cell phenotype loss (CD7-, CD26-).

Clinically presents with intractable pruritic erythroderma, lymphadenopathy, alopecia, palmoplantar hyperkeratosis, ectropion, and onychodystrophy. Median survival is 2-4 years with poor 5-year survival of 24%; immunosuppression leads to increased infection risk and second malignancies.

Symptoms

Generalized erythroderma covering >80% body surface area
Severe intractable pruritus often disabling
Palpable lymphadenopathy in cervical, axillary, inguinal regions
Alopecia diffuse or patchy
Palmoplantar hyperkeratosis with painful fissuring
Ectropion (eyelid eversion) from skin fibrosis
Onychodystrophy with nail thickening and discoloration

Risk Factors

Age over 60 years (median age at diagnosis)
Male predominance (2:1 ratio)
Race: more common in African Americans
Prior mycosis fungoides progression to leukemic phase
HTLV-1 infection (some cases)
Genetic factors not fully understood
Environmental: pesticide exposure (controversial)

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Generalized red scaly skin not responding to standard treatments
  • Severe pruritus disrupting sleep and quality of life
  • Enlarged lymph nodes with erythroderma
  • Progressive skin involvement after mycosis fungoides diagnosis
  • Failure of topical and phototherapy in suspected CTCL
  • Constitutional symptoms (weight loss, fever, fatigue)
  • Recurrent skin infections in setting of erythroderma

Treatment Methods

01
Diagnostic confirmation: skin biopsy with TCR gene rearrangement, peripheral blood Sézary cell flow cytometry (CD4/CD8 ratio, CD7-, CD26-)
02
Staging: lymph node biopsy, CT chest/abdomen/pelvis, PET-CT for advanced disease
03
First-line: extracorporeal photopheresis (ECP) 2 days every 2-4 weeks targeting blood Sézary cells
04
Combination skin-directed therapy: PUVA, UVB, topical corticosteroids, mechlorethamine gel
05
Systemic targeted therapy: bexarotene oral retinoid 300 mg/m²/day, mogamulizumab anti-CCR4 IgG1
06
Brentuximab vedotin (anti-CD30 ADC) for CD30+ disease, alemtuzumab anti-CD52 for refractory cases
07
Histone deacetylase inhibitors: vorinostat, romidepsin for advanced disease
08
Allogeneic stem cell transplantation potentially curative for selected young patients with chemosensitive disease
09
Aggressive supportive care: pruritus management with gabapentin, mirtazapine, infection prophylaxis
10
Palliative care for advanced disease focusing on symptom control and quality of life

Which Department to Visit?

You can visit our Dermatoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.