Publications by authors named "Pascale Guitera"

Overdiagnosis in melanoma is a nuanced and evolutionary issue. It may appear to be an epidemic from an epidemiological point of view; however, it is important to appreciate all perspectives. We consider overdiagnosis a necessary challenge-which drives clinicians to improve diagnostic accuracy and reduce overtreatment-pathologists to recalibrate histopathological thresholds and reduce overcalling-and researchers to develop markers of biological activity for melanoma.

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Background: Actinic keratoses (AKs), also known as solar keratoses, are precancerous skin lesions that typically occur following long-term exposure to ultraviolet radiation. AKs can evolve into cutaneous squamous cell carcinoma (SCC) if left untreated. Treatments for AKs typically cause temporary, irritable erythematous skin barrier disruption.

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Background: For patients with lentigo maligna who are not suitable for surgery, radiotherapy, or topical imiquimod are alternative nonsurgical treatments.

Objective: This trial aimed to assess the efficacy, safety, and patient-reported health-related quality of life (HRQL).

Methods: A multiinstitutional, phase 3, randomized trial conducted between August 2015 and November 2021.

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Artificial Intelligence (AI) refers to the ability of computers to mimic human intelligence. In response to the growing interest and impact of AI, the Australasian College of Dermatologists released its first Position Statement on AI in dermatology in 2022. This Position Statement provided guidance for dermatologists on the appropriate use of AI.

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Background: Simulation modelling can assist with health care decision making. To inform the development and improvement of skin cancer focussed microsimulation models, we conducted a systematic review and narrative synthesis of published skin cancer models to assess the structure, parameterisation, and assumptions.

Methods: The electronic databases OVIDMedline including Embase and the Cost-Effectiveness Analysis (CEA) Registry were searched up to 7 May 2025.

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Diagnosing and treating skin diseases require advanced visual skills across domains and the ability to synthesize information from multiple imaging modalities. While current deep learning models excel at specific tasks such as skin cancer diagnosis from dermoscopic images, they struggle to meet the complex, multimodal requirements of clinical practice. Here we introduce PanDerm, a multimodal dermatology foundation model pretrained through self-supervised learning on over 2 million real-world skin disease images from 11 clinical institutions across 4 imaging modalities.

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Introduction: Treatments such as 4% 5-fluorouracil (5-FU) cream have demonstrated strong efficacy in lesion clearance of actinic keratosis; however, local skin reactions (LSR) during treatment remain a significant challenge, potentially affecting patient adherence.

Objective: We sought to build consensus on management of LSR associated with 4% 5-FU using the Delphi methodology.

Methods: Twenty-eight expert dermatologists participated in a 3-round Delphi process.

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Background: There is lack of uniformity in reflectance confocal microscopy (RCM) terminology.

Objective: To establish expert consensus on a standardized set of RCM terms that describe non-melanocytic lesions (NMLs).

Methods: We invited RCM experts to participate in a Delphi-consensus study.

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Background: Factors associated with nonadherence to guideline-recommended complete excision of suspicious cutaneous lesions are unclear.

Objective: The purpose of this study was to analyze patient, melanoma, and clinician factors associated with initial diagnostic biopsy type and determine whether unwarranted variation from guidelines occurred.

Methods: This population-based, cohort study involved the analysis of data from questionnaires completed by clinicians who managed patients with newly diagnosed, histopathologically confirmed primary invasive cutaneous melanomas reported to the New South Wales Cancer Registry between 2006 and 2007.

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Objective: To investigate the effectiveness of the Melanoma Care Programme when implemented into routine clinical practice coupled with fear of cancer recurrence (FCR) screening and a stepped-care model of intervention delivery.

Methods: Using a Type-I hybrid effectiveness-implementation design, individuals with stage 0-II melanoma and a Fear of Cancer Recurrence Inventory FCR severity score of ≥ 13 were offered the Melanoma Care Programme. The programme included a psychoeducational booklet and 3 to 5 psychotherapeutic telehealth sessions with a clinical psychologist, timed around routine dermatological appointments.

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Background: While the high accuracy of reported AI tools for melanoma detection is promising, the lack of holistic consideration of the patient is often criticized. Along with medical history, a dermatologist would also consider intra-patient nevi patterns, such that nevi that are different from others on a given patient are treated with suspicion.

Objective: To evaluate whether patient-contextual lesion-images improves diagnostic accuracy for melanoma in a dermoscopic image-based AI competition and a human reader study.

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Background: Lentigo maligna (LM) is a growing problem worldwide and the main type of melanoma in situ in some Caucasian populations. It presents as a spectrum from atypical intraepidermal melanocytic proliferation (AIMP) to invasive lentigo maligna melanoma (LMM). Accurate diagnosis and staging are crucial for determining appropriate management strategies.

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Article Synopsis
  • Cutaneous confocal microscopy (CCCM) is a technique that allows for detailed imaging of the skin at a cellular level, and this study tested a remote version (Remote-CCM) to enhance access to skin cancer diagnoses.
  • In the study, 201 lesions were assessed, with Remote-CCM showing a sensitivity of 89% for detecting skin malignancies and a specificity of 64%, effectively reducing unnecessary biopsies in 90% of benign cases.
  • The findings suggest that while Remote-CCM is accurate and can lower biopsy rates, it may not be suitable for potential cases of squamous cell carcinoma (SCC), indicating a need for follow-up on uncertain melanoc
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Population-wide skin cancer screening is not currently recommended in most countries. Instead, most clinical guidelines incorporate risk-based recommendations for skin checks, despite limited evidence around implementation and adherence to recommendations in practice. We aimed to determine adherence to personal risk-tailored melanoma skin check schedules and explore reasons influencing adherence.

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AI image classification algorithms have shown promising results when applied to skin cancer detection. Most public skin cancer image datasets are comprised of dermoscopic photos and are limited by selection bias, lack of standardization, and lend themselves to development of algorithms that can only be used by skilled clinicians. The SLICE-3D ("Skin Lesion Image Crops Extracted from 3D TBP") dataset described here addresses those concerns and contains images of over 400,000 distinct skin lesions from seven dermatologic centers from around the world.

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Objective: We investigated the association between sun protection behaviours and demographic and melanoma risk characteristics of patients attending Australian melanoma specialist clinics. This may assist in targeting and tailoring melanoma prevention patient education for people at high-risk and specific population subgroups.

Methods: A cross-sectional analysis of questionnaire data collected from participants attending the dermatology clinics at two major melanoma centres in Sydney, Australia between February 2021 and September 2023.

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In recent years, there has been a surge in the development of AI-based Software as a Medical Device (SaMD), particularly in visual specialties such as dermatology. In Australia, the Therapeutic Goods Administration (TGA) regulates AI-based SaMD to ensure its safe use. Proper labelling of these devices is crucial to ensure that healthcare professionals and the general public understand how to use them and interpret results accurately.

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The aim of this study was to investigate the appropriateness of suspected skin cancer referrals made by nonmedical practitioners (NMPs) and compare this with referrals made by local general practitioners (GPs). Data were collected prospectively from patients referred from primary care to a UK hospital dermatology department. The profession of the referrer was ascertained from review of referral letters and direct questioning.

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