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Total skin electron beam therapy.

Lena Specht1

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Total skin electron beam therapy (TSEBT) is effective for widespread cutaneous lymphomas. Lower doses of TSEBT are repeatable and offer significant palliation for mycosis fungoides, unlike higher doses or photon therapy.

Keywords:
cutaneous lymphomashematological malignanciesmycosis fungoidesradiation therapytotal skin electron beam therapy

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Area of Science:

  • Oncology
  • Dermatology
  • Radiation Oncology

Background:

  • Primary cutaneous lymphomas are radiosensitive, but conventional X-rays are unsuitable for widespread skin involvement due to organ toxicity.
  • Electrons offer superficial treatment ideal for skin lesions, leading to the development of Total Skin Electron Beam Therapy (TSEBT).

Purpose of the Study:

  • To evaluate the efficacy and safety of Total Skin Electron Beam Therapy (TSEBT) for treating primary cutaneous lymphomas, particularly mycosis fungoides.
  • To compare the outcomes of low-dose versus high-dose TSEBT and assess the suitability of photon therapy.

Main Methods:

  • Review of techniques for uniform skin surface electron dose delivery to a depth of 1-1.5 cm.
  • Analysis of historical high-dose (30-36 Gy) TSEBT protocols for mycosis fungoides.
  • Evaluation of current low-dose (10-12 Gy) TSEBT protocols and their repeatability.
  • Comparison with photon-based total skin irradiation techniques like tomotherapy.

Main Results:

  • TSEBT is highly effective for superficial, widespread cutaneous lymphomas.
  • Low-dose TSEBT (10-12 Gy) achieves excellent response rates and can be repeated up to six times, offering significant palliation.
  • High-dose TSEBT (30-36 Gy) is less repeatable and generally reserved for resistant cases.
  • Photon therapy, including tomotherapy, results in unacceptable bone marrow toxicity due to deeper radiation penetration, which is not observed with TSEBT.

Conclusions:

  • Total Skin Electron Beam Therapy (TSEBT) is the most effective skin-directed therapy for widespread primary cutaneous lymphomas.
  • Low-dose, repeatable TSEBT provides superior palliation and safety compared to historical high-dose regimens and is preferred for most mycosis fungoides patients.
  • Electrons are superior to photons for total skin irradiation due to their limited penetration and lack of bone marrow toxicity.