Search results for "melanooma"
showing 6 items of 6 documents
C8161-melanoomasolulinjan erittämien tekijöiden vaikutus fibroblastien hyaluronaanituotantoon
2011
Hyaluronaani on suurikokoinen soluväliaineen sokerirakenne. Se koostuu toistuvista sokerimolekyyleistä N- asetyyliglukosaminista ja glukuronihaposta. Hyaluronaani syntetisoidaan solukalvolla hyaluronaani- syntaasien (HAS) toimesta, joita nisäkkäillä on kolme isomuotoa (HAS1-3). Hyaluronaanin hajotus tapahtuu hyaluronidaasientsyymien (Hyal) toimesta. Hyaluronaanin pääasiallinen solukalvoreseptori on CD44, jonka avulla hyaluronaaniketjut ovat sitoutuneet solukalvoon. Hyaluronaania esiintyy runsaasti etenkin sidekudoksessa ja kerrostuneessa epiteelissä kuten ihossa. Hyaluronaanin määrän on havaittu lisääntyneen syövissä ja tämä korreloi useasti potilaan huonon ennusteen kanssa. Hyaluronaanin l…
Hyperspectral imaging in detecting dermal invasion in lentigo maligna melanoma
2017
Ablative fractional laser-assisted photodynamic therapy for lentigo maligna: a prospective pilot study.
2019
Background Lentigo maligna (LM) is an in‐situ form of melanoma carrying a risk of progression to invasive lentigo maligna melanoma (LMM). LM poses a clinical challenge, with subclinical extension and high recurrence rates after incomplete surgery. Alternative treatment methods have been investigated with varying results. Photodynamic therapy (PDT) with methylaminolaevulinate (MAL) has already proved promising in this respect. Objectives To investigate the efficacy of ablative fractional laser (AFL)‐assisted PDT with 5‐aminolaevulinic acid nanoemulsion (BF‐200 ALA) for treating LM. Methods In this non‐sponsored, prospective pilot study ten histologically verified LMs were treated with AFL‐as…
Differentiating Malignant from Benign for Melanocytic and Non-melanocytic Skin Tumors : A Pilot Study on Hyperspectral Imaging and Convolutional Neur…
2022
Differentiating Malignant from Benign Pigmented or Non-Pigmented Skin Tumours—A Pilot Study on 3D Hyperspectral Imaging of Complex Skin Surfaces and …
2022
Several optical imaging techniques have been developed to ease the burden of skin cancer disease on our health care system. Hyperspectral images can be used to identify biological tissues by their diffuse reflected spectra. In this second part of a three-phase pilot study, we used a novel hand-held SICSURFIS Spectral Imager with an adaptable field of view and target-wise selectable wavelength channels to provide detailed spectral and spatial data for lesions on complex surfaces. The hyperspectral images (33 wavelengths, 477–891 nm) provided photometric data through individually controlled illumination modules, enabling convolutional networks to utilise spectral, spatial, and skin-surface mo…
Hyperspectral Imaging for Non-invasive Diagnostics of Melanocytic Lesions
2022
Malignant melanoma poses a clinical diagnostic problem, since a large number of benign lesions are excised to find a single melanoma. This study assessed the accuracy of a novel non-invasive diagnostic technology, hyperspectral imaging, for melanoma detection. Lesions were imaged prior to excision and histopathological analysis. A deep neural network algorithm was trained twice to distinguish between histopathologically verified malignant and benign melanocytic lesions and to classify the separate subgroups. Furthermore, 2 different approaches were used: a majority vote classification and a pixel-wise classification. The study included 325 lesions from 285 patients. Of these, 74 were invasi…