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  1. Article: Trocar Site Recurrence after Laparoscopic Cholecystectomy for Unsuspected Isolated Gallbladder Metastasis of Melanoma: A Case Report and Review of the Literature.

    Sergeant, Céline / Kerger, Joseph / Drowart, Annie / Sales, François / Langouo, Mireille

    Case reports in oncology

    2023  Volume 16, Issue 1, Page(s) 1183–1195

    Abstract: Cutaneous melanoma can metastasize to almost any organ, including in-transit metastases, lymph nodes, liver, lungs, brain, and bones. Spread to the gastrointestinal tract is less common and generally concerns the small bowel, colon, and stomach. ... ...

    Abstract Cutaneous melanoma can metastasize to almost any organ, including in-transit metastases, lymph nodes, liver, lungs, brain, and bones. Spread to the gastrointestinal tract is less common and generally concerns the small bowel, colon, and stomach. Gallbladder involvement is rarer, and only few cases describe it as the sole site of metastasis upon diagnosis. Melanoma metastases to the gallbladder are usually detected on staging or surveillance imaging, as patients usually show few or no symptoms. In resectable stage IV melanoma patients, complete surgical resection appears to improve the prognosis. However, due to the rarity of isolated gallbladder metastasis of melanoma, there are no guidelines regarding the optimal surgical approach (endoscopic or open cholecystectomy). Here, we report the case of isolated gallbladder melanoma metastasis found after laparoscopic cholecystectomy performed in a 46-year-old female patient with no known history of cancer presenting with acute cholecystitis symptoms. Six weeks after surgery, the patient developed trocar site recurrence. This case highlights the importance of a planned and open surgery for resectable melanoma metastases rather than a laparoscopic approach.
    Language English
    Publishing date 2023-10-18
    Publishing country Switzerland
    Document type Case Reports
    ZDB-ID 2458961-5
    ISSN 1662-6575
    ISSN 1662-6575
    DOI 10.1159/000534147
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Correction: Krayem et al. The Benefit of Reactivating p53 under MAPK Inhibition on the Efficacy of Radiotherapy in Melanoma.

    Krayem, Mohammad / Sabbah, Malak / Najem, Ahmad / Wouters, An / Lardon, Filip / Simon, Stephane / Sales, François / Journe, Fabrice / Awada, Ahmad / Ghanem, Ghanem E / Van Gestel, Dirk

    Cancers

    2023  Volume 15, Issue 24

    Abstract: In the original article [ ... ]. ...

    Abstract In the original article [...].
    Language English
    Publishing date 2023-12-15
    Publishing country Switzerland
    Document type Published Erratum
    ZDB-ID 2527080-1
    ISSN 2072-6694
    ISSN 2072-6694
    DOI 10.3390/cancers15245860
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Dasatinib Stimulates Its Own Mechanism of Resistance by Activating a CRTC3/MITF/Bcl-2 Pathway in Melanoma with Mutant or Amplified c-Kit.

    Sabbah, Malak / Krayem, Mohammad / Najem, Ahmad / Sales, François / Miller, Wilson / Del Rincon, Sonia / Awada, Ahmad / Ghanem, Ghanem E / Journe, Fabrice

    Molecular cancer research : MCR

    2021  Volume 19, Issue 7, Page(s) 1221–1233

    Abstract: Amplification or activating mutations of c-Kit are a frequent oncogenic alteration, which occurs commonly in acral and mucosal melanoma. Among c-Kit inhibitors, dasatinib is the most active due to its ability to bind both active and inactive ... ...

    Abstract Amplification or activating mutations of c-Kit are a frequent oncogenic alteration, which occurs commonly in acral and mucosal melanoma. Among c-Kit inhibitors, dasatinib is the most active due to its ability to bind both active and inactive conformations of the receptor. However, its use as a single agent in melanoma showed limited clinical benefit. We first found that sensitivity to dasatinib is restricted to melanoma cell lines harboring c-Kit alteration but, unexpectedly, we observed lower effect at higher concentrations that can readily be found in patient blood. We then investigated relevant pathway alterations and found complete inhibition of MAPK and PI3K/AKT pathways but an increase in MITF and its downstream target Bcl-2 through CRTC3 pathway, which turn on the CREB regulated transcription of MITF. More importantly, dasatinib upregulates MITF and Bcl-2 through SIK2 inhibition revealed by CRTC3 reduced phosphorylation, CREB transcription activation of MITF, MITF transcription activation of Bcl-2 as well as pigmentation. Furthermore, overexpression of MITF renders melanoma cells resistant to all dasatinib concentrations. Selective Bcl-2 inhibition by ABT-199 or Bcl-2 knockout restores the sensitivity of melanoma cells to dasatinib, validating the involvement of MITF and Bcl-2 axis in the resistance of melanoma to dasatinib. In conclusion, we showed for the first time that dasatinib in melanoma stimulates its proper mechanism of resistance, independently of MAPK and PI3K/AKT pathways reactivation commonly associated to secondary c-Kit mutations, but through CRTC3/MITF/Bcl-2 pathway activation at clinically relevant doses which may explain the weak clinical benefit of dasatinib in patients with melanoma. IMPLICATIONS: Dasatinib stimulates its proper mechanism of resistance through CRTC3/MITF/Bcl-2 pathway, which may explain its modest clinical efficiency in patients with melanoma.
    MeSH term(s) Antineoplastic Agents/pharmacology ; Apoptosis/drug effects ; Apoptosis/genetics ; Cell Line, Tumor ; Cell Proliferation/drug effects ; Cell Proliferation/genetics ; Dasatinib/pharmacology ; Drug Resistance, Neoplasm/drug effects ; Drug Resistance, Neoplasm/genetics ; Gene Amplification ; Gene Expression Regulation, Neoplastic/drug effects ; Humans ; Melanoma/genetics ; Melanoma/metabolism ; Melanoma/pathology ; Microphthalmia-Associated Transcription Factor/genetics ; Microphthalmia-Associated Transcription Factor/metabolism ; Mutation ; Proteins/genetics ; Proteins/metabolism ; Proto-Oncogene Proteins c-bcl-2/genetics ; Proto-Oncogene Proteins c-bcl-2/metabolism ; Proto-Oncogene Proteins c-kit/genetics ; Proto-Oncogene Proteins c-kit/metabolism ; Signal Transduction/drug effects ; Signal Transduction/genetics ; Transcription Factors/genetics ; Transcription Factors/metabolism
    Chemical Substances Antineoplastic Agents ; CRTC3 protein, human ; Microphthalmia-Associated Transcription Factor ; Proteins ; Proto-Oncogene Proteins c-bcl-2 ; Transcription Factors ; Proto-Oncogene Proteins c-kit (EC 2.7.10.1) ; Dasatinib (RBZ1571X5H)
    Language English
    Publishing date 2021-03-19
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2098788-2
    ISSN 1557-3125 ; 1541-7786
    ISSN (online) 1557-3125
    ISSN 1541-7786
    DOI 10.1158/1541-7786.MCR-20-1040
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Corrigendum to 'p53 Reactivation by PRIMA-1Met (APR-246) sensitises V600E/KBRAF melanoma to vemurafenib'[Eur J of Cancer 55 (2016) 98-110].

    Krayem, Mohammad / Journe, Fabrice / Wiedig, Murielle / Morandini, Renato / Najem, Ahmad / Salès, François / van Kempen, Leon C / Sibille, Catherine / Awada, Ahmad / Marine, Jean-Christophe / Ghanem, Ghanem

    European journal of cancer (Oxford, England : 1990)

    2022  Volume 175, Page(s) 336–338

    Language English
    Publishing date 2022-09-24
    Publishing country England
    Document type Published Erratum
    ZDB-ID 82061-1
    ISSN 1879-0852 ; 0277-5379 ; 0959-8049 ; 0964-1947
    ISSN (online) 1879-0852
    ISSN 0277-5379 ; 0959-8049 ; 0964-1947
    DOI 10.1016/j.ejca.2022.09.002
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Tyrosine-Dependent Phenotype Switching Occurs Early in Many Primary Melanoma Cultures Limiting Their Translational Value.

    Najem, Ahmad / Wouters, Jasper / Krayem, Mohammad / Rambow, Florian / Sabbah, Malak / Sales, François / Awada, Ahmad / Aerts, Stein / Journe, Fabrice / Marine, Jean-Christophe / Ghanem, Ghanem E

    Frontiers in oncology

    2021  Volume 11, Page(s) 780654

    Abstract: The use of patient-derived primary cell cultures in cancer preclinical assays, including drug screens and genotoxic studies, has increased in recent years. However, their translational value is constrained by several limitations, including variability ... ...

    Abstract The use of patient-derived primary cell cultures in cancer preclinical assays, including drug screens and genotoxic studies, has increased in recent years. However, their translational value is constrained by several limitations, including variability that can be caused by the culture conditions. Here, we show that the medium composition commonly used to propagate primary melanoma cultures has limited their representability of their tumor of origin and their cellular plasticity, and modified their sensitivity to therapy. Indeed, we established and compared cultures from different melanoma patients propagated in parallel in low-tyrosine (Ham's F10) or in high-tyrosine (Ham's F10 supplemented with tyrosine or RPMI1640 or DMEM) media. Tyrosine is the precursor of melanin biosynthesis, a process particularly active in differentiated melanocytes and melanoma cells. Unexpectedly, we found that the high tyrosine concentrations promoted an early phenotypic drift towards either a mesenchymal-like or senescence-like phenotype, and prevented the establishment of cultures of melanoma cells harboring differentiated features, which we show are frequently present in human clinical biopsies. Moreover, the invasive phenotype emerging in these culture conditions appeared irreversible and, as expected, associated with intrinsic resistance to MAPKi. In sharp contrast, differentiated melanoma cell cultures retained their phenotypes upon propagation in low-tyrosine medium, and importantly their phenotypic plasticity, a key hallmark of melanoma cells. Altogether, our findings underline the importance of culturing melanoma cells in low-tyrosine-containing medium in order to preserve their phenotypic identity of origin and cellular plasticity.
    Language English
    Publishing date 2021-11-11
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2649216-7
    ISSN 2234-943X
    ISSN 2234-943X
    DOI 10.3389/fonc.2021.780654
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Acquired resistance to BRAFi reverses senescence-like phenotype in mutant BRAF melanoma.

    Krayem, Mohammad / Najem, Ahmad / Journe, Fabrice / Morandini, Renato / Sales, François / Awada, Ahmad / Ghanem, Ghanem E

    Oncotarget

    2018  Volume 9, Issue 61, Page(s) 31888–31903

    Abstract: Targeting MAPK pathway in mutant BRAF melanoma with the specific BRAF inhibitor vemurafenib showed robust initial responses in the majority of patients followed by relapses due to acquired resistance to the drug. ... ...

    Abstract Targeting MAPK pathway in mutant BRAF melanoma with the specific BRAF inhibitor vemurafenib showed robust initial responses in the majority of patients followed by relapses due to acquired resistance to the drug. In
    Language English
    Publishing date 2018-08-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2560162-3
    ISSN 1949-2553 ; 1949-2553
    ISSN (online) 1949-2553
    ISSN 1949-2553
    DOI 10.18632/oncotarget.25879
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: P53 and MITF/Bcl-2 identified as key pathways in the acquired resistance of NRAS-mutant melanoma to MEK inhibition.

    Najem, Ahmad / Krayem, Mohammad / Salès, François / Hussein, Nader / Badran, Bassam / Robert, Caroline / Awada, Ahmad / Journe, Fabrice / Ghanem, Ghanem E

    European journal of cancer (Oxford, England : 1990)

    2017  Volume 83, Page(s) 154–165

    Abstract: Activating mutations in Neuroblastoma RAS viral oncogene homolog (NRAS) are found in 15-30% of melanomas and are associated with a poor prognosis. Although MAP kinase kinase (MEK) inhibitors used as single agents showed a limited clinical benefit in ... ...

    Abstract Activating mutations in Neuroblastoma RAS viral oncogene homolog (NRAS) are found in 15-30% of melanomas and are associated with a poor prognosis. Although MAP kinase kinase (MEK) inhibitors used as single agents showed a limited clinical benefit in patients with NRAS-mutant melanoma due to their rather cytostatic effect and high toxicity, their combination with other inhibitors of pathways known to cooperate with MEK inhibition may maximise their antitumour activity. Similarly, in a context where p53 is largely inactivated in melanoma, hyperexpression of Microphthalmia associated transcription factor (MITF) and its downstream anti-apoptotic targets may be the cause of the restraint cytotoxic effects of MEK inhibitors. Indeed, drug combinations targeting both mutant BRAF and MITF or one of its important targets Bcl-2 were effective in mutant BRAF melanoma but had no effect on acquired resistance. Therefore, we aimed to further investigate the downstream MITF targets that can explain this anti-apoptotic effect and to evaluate in parallel the effect of p53 reactivation on the promotion of apoptosis under MEK inhibition in a panel of
    MeSH term(s) Apoptosis/drug effects ; Cell Line, Tumor ; Drug Resistance, Neoplasm/genetics ; GTP Phosphohydrolases/genetics ; Humans ; MAP Kinase Kinase Kinases/antagonists & inhibitors ; Melanoma/drug therapy ; Melanoma/genetics ; Membrane Proteins/genetics ; Microphthalmia-Associated Transcription Factor/antagonists & inhibitors ; Molecular Targeted Therapy/methods ; Prognosis ; Protein Kinase Inhibitors/therapeutic use ; Tumor Suppressor Protein p53/physiology ; bcl-2-Associated X Protein/antagonists & inhibitors
    Chemical Substances Membrane Proteins ; Microphthalmia-Associated Transcription Factor ; Protein Kinase Inhibitors ; Tumor Suppressor Protein p53 ; bcl-2-Associated X Protein ; MAP Kinase Kinase Kinases (EC 2.7.11.25) ; GTP Phosphohydrolases (EC 3.6.1.-) ; NRAS protein, human (EC 3.6.1.-)
    Language English
    Publishing date 2017-09
    Publishing country England
    Document type Journal Article
    ZDB-ID 82061-1
    ISSN 1879-0852 ; 0277-5379 ; 0959-8049 ; 0964-1947
    ISSN (online) 1879-0852
    ISSN 0277-5379 ; 0959-8049 ; 0964-1947
    DOI 10.1016/j.ejca.2017.06.033
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: The Benefit of Reactivating p53 under MAPK Inhibition on the Efficacy of Radiotherapy in Melanoma.

    Krayem, Mohammad / Sabbah, Malak / Najem, Ahmad / Wouters, An / Lardon, Filip / Simon, Stephane / Sales, François / Journe, Fabrice / Awada, Ahmad / Ghanem, Ghanem E / Van Gestel, Dirk

    Cancers

    2019  Volume 11, Issue 8

    Abstract: Radiotherapy (RT) in patients with melanoma historically showed suboptimal results, because the disease is often radioresistant due to various mechanisms such as scavenging free radicals by thiols, pigmentary machinery, or enhanced DNA repair. However, ... ...

    Abstract Radiotherapy (RT) in patients with melanoma historically showed suboptimal results, because the disease is often radioresistant due to various mechanisms such as scavenging free radicals by thiols, pigmentary machinery, or enhanced DNA repair. However, radiotherapy has been utilized as adjuvant therapy after the complete excision of primary melanoma and lymph nodes to reduce the rate of nodal recurrences in high-risk patients. The resistance of melanoma cells to radiotherapy may also be in relation with the constitutive activation of the MAPK pathway and/or with the inactivation of p53 observed in about 90% of melanomas. In this study, we aimed to assess the potential benefit of adding RT to BRAF-mutated melanoma cells under a combined p53 reactivation and MAPK inhibition in vitro and in a preclinical animal model. We found that the combination of BRAF inhibition (vemurafenib, which completely shuts down the MAPK pathway), together with p53 reactivation (PRIMA-1
    Language English
    Publishing date 2019-08-01
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527080-1
    ISSN 2072-6694
    ISSN 2072-6694
    DOI 10.3390/cancers11081093
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Prominent role of cyclic adenosine monophosphate signalling pathway in the sensitivity of (WT)BRAF/(WT)NRAS melanoma cells to vemurafenib.

    Krayem, Mohammad / Journe, Fabrice / Wiedig, Murielle / Morandini, Renato / Sales, François / Awada, Ahmad / Ghanem, Ghanem

    European journal of cancer (Oxford, England : 1990)

    2014  Volume 50, Issue 7, Page(s) 1310–1320

    Abstract: Vemurafenib improves survival in patients with melanoma bearing the (V600E)BRAF mutation, but it did not show any benefit in clinical trials focusing on wild type tumours while it may well inhibit (WT)BRAF considering the dosage used and the ... ...

    Abstract Vemurafenib improves survival in patients with melanoma bearing the (V600E)BRAF mutation, but it did not show any benefit in clinical trials focusing on wild type tumours while it may well inhibit (WT)BRAF considering the dosage used and the bioavailability of the drug. As tumours may contain a mixture of mutant and wild type BRAF cells and this has been also put forward as a resistance mechanism, we aimed to evaluate the sensitivity/resistance of six, randomly selected, (WT)BRAF/(WT)NRAS lines to vemurafenib and found four sensitive. The sensitivity to the drug was accompanied by a potent inhibition of both phospho-ERK and phospho-AKT, and a significant induction of apoptosis while absent in lines with intrinsic or acquired resistance. Phospho-CRAF expression was low in all sensitive lines and high in resistant ones, and MEK inhibition can effectively potentiate the drug effect. A possible explanation for CRAF modulation is cyclic adenosine monophosphate (cAMP), a mediator of melanocortin receptor 1 (MC1R) signalling, since it can actually inhibit CRAF. Indeed, we measured cAMP and found that all four sensitive lines contained significantly higher constitutive cAMP levels than the resistant ones. Consequently, vemurafenib and cAMP stimulator combination resulted in a substantial synergistic effect in lines with both intrinsic and acquired resistance but only restricted to those where cAMP was effectively increased. The use of a cAMP agonist overcame such restriction. In conclusion, we report that (WT)BRAF/(WT)NRAS melanoma lines with low phospho-CRAF and high cAMP levels may be sensitive to vemurafenib and that CRAF inhibition through cAMP stimulation may overcome the resistance to the drug.
    MeSH term(s) Antineoplastic Agents/pharmacology ; Apoptosis/drug effects ; Cell Line, Tumor ; Cell Proliferation/drug effects ; Cyclic AMP/metabolism ; Cyclic AMP/physiology ; Drug Screening Assays, Antitumor/methods ; GTP Phosphohydrolases/physiology ; Genes, ras ; Humans ; Indoles/pharmacology ; Melanoma/drug therapy ; Melanoma/genetics ; Membrane Proteins/physiology ; Protein Kinase Inhibitors/pharmacology ; Proto-Oncogene Proteins B-raf/antagonists & inhibitors ; Proto-Oncogene Proteins B-raf/genetics ; Signal Transduction/physiology ; Sulfonamides/pharmacology
    Chemical Substances Antineoplastic Agents ; Indoles ; Membrane Proteins ; Protein Kinase Inhibitors ; Sulfonamides ; vemurafenib (207SMY3FQT) ; Cyclic AMP (E0399OZS9N) ; Proto-Oncogene Proteins B-raf (EC 2.7.11.1) ; GTP Phosphohydrolases (EC 3.6.1.-) ; NRAS protein, human (EC 3.6.1.-)
    Language English
    Publishing date 2014-05
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 82061-1
    ISSN 1879-0852 ; 0277-5379 ; 0959-8049 ; 0964-1947
    ISSN (online) 1879-0852
    ISSN 0277-5379 ; 0959-8049 ; 0964-1947
    DOI 10.1016/j.ejca.2014.01.021
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Immunohistochemical study of 40 cases of longitudinal melanonychia.

    Theunis, Anne / Richert, Bertrand / Sass, Ursula / Lateur, Nadine / Sales, François / André, Josette

    The American Journal of dermatopathology

    2011  Volume 33, Issue 1, Page(s) 27–34

    Abstract: The etiology of longitudinal melanonychia (LM) is difficult to establish by clinical and dermoscopic examinations alone. Microscopic examination of the nail matrix remains crucial. Two groups of LM may be identified: melanocytic activation (melanic ... ...

    Abstract The etiology of longitudinal melanonychia (LM) is difficult to establish by clinical and dermoscopic examinations alone. Microscopic examination of the nail matrix remains crucial. Two groups of LM may be identified: melanocytic activation (melanic pigmentation of the matrix epithelium without any increase in the density of melanocytes) and melanocytic proliferation (lentigo, nevus, or melanoma). The histological examination is challenging, and immunohistochemical investigations can be helpful. The objective of this study was to analyze the immunohistochemical findings with routinely used markers in melanocytic tumors-S-100 protein, HMB-45, and Melan-A-in LM. A series of 40 cases were analyzed: 10 activations, 4 lentigines, 7 nevi, 12 in situ melanomas, and 7 invasive melanomas. The sensitivity of S-100 protein is weak in benign and malignant intraepithelial melanocytes of the nail matrix, and if this marker is performed alone, it may be wrongly reassuring. However, the use of S-100 protein is essential to differentiate invasive melanoma, lacking an intraepithelial component, and particularly desmoplastic melanoma, from epithelial and mesenchymal tumors. HMB-45 and Melan-A are more sensitive than S-100 protein for the evaluation of intraepithelial melanocytic proliferation of the nail apparatus, with HMB-45 being the most intense marker. In the dermal component, HMB-45 and Melan-A were less sensitive than S-100 protein. In conclusion, we recommend that the panel of antibodies used for histological evaluation of LM should include HMB-45 and/or Melan-A and S-100 protein only if an invasive melanoma is suspected.
    MeSH term(s) Adolescent ; Adult ; Aged ; Aged, 80 and over ; Biomarkers/analysis ; Child ; Child, Preschool ; Female ; Humans ; Immunohistochemistry ; MART-1 Antigen/biosynthesis ; Male ; Melanins/metabolism ; Melanocytes/pathology ; Middle Aged ; Nail Diseases/metabolism ; Nail Diseases/pathology ; S100 Proteins/biosynthesis
    Chemical Substances Biomarkers ; MART-1 Antigen ; Melanins ; S100 Proteins
    Language English
    Publishing date 2011-02
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 448469-1
    ISSN 1533-0311 ; 0193-1091
    ISSN (online) 1533-0311
    ISSN 0193-1091
    DOI 10.1097/DAD.0b013e3181e67c87
    Database MEDical Literature Analysis and Retrieval System OnLINE

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