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Consider a real-valued function defined on a closed interval. One of the fundamental objectives in calculus is to determine the area under the graph of such a function. When an exact computation is not readily available, this area can be estimated by dividing the interval into a finite number of equal subintervals. Each subinterval corresponds to a rectangle whose width is the length of the subinterval and whose height is determined by the value of the function at a selected point within that...
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Experience with Treating Lentigo Maligna with Definitive Radiotherapy.

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Lentigo maligna (LM), a melanoma in situ, may require radiotherapy (RT) when surgery is not feasible. This review shares experiences to guide RT planning and management for LM, especially in challenging cases.

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Area of Science:

  • Dermatology
  • Radiation Oncology
  • Oncology

Background:

  • Lentigo maligna (LM) is a melanoma in situ on sun-damaged skin, potentially progressing to invasive melanoma.
  • Surgical excision is standard, but not always suitable due to patient factors or treatment failure.
  • Alternative therapies like radiotherapy (RT) and topical imiquimod are considered for non-surgical candidates.

Purpose of the Study:

  • To share institutional experience with radiotherapy for lentigo maligna (LM).
  • To guide other centers participating in a multi-institutional trial comparing imiquimod and RT for LM.
  • To provide expertise on RT planning, treatment, and side effect management for LM.

Main Methods:

  • Review of experience from a center with significant patient enrollment in an ongoing LM radiotherapy trial.
  • Discussion of RT planning considerations, treatment delivery, and adverse event management.
  • Exploration of specific LM scenarios: immunosuppressed patients, poorly vascularized tissue, post-surgical cases, and lesions on eyelids or mucous membranes.

Main Results:

  • The review synthesizes practical experience to support the use of RT for LM.
  • It addresses common challenges and specific patient populations encountered in LM treatment.
  • Guidance is provided for managing side effects and optimizing RT outcomes.

Conclusions:

  • Radiotherapy is a viable alternative for lentigo maligna when surgery is contraindicated or has failed.
  • Careful planning and management are crucial for successful RT outcomes in LM.
  • Sharing clinical experience is vital for improving patient care and facilitating multi-center trials.