Abstract:
:Despite the introduction of novel targeted therapies, chemotherapy still remains the primary treatment for metastatic melanoma in poorly funded healthcare environments or in case of disease relapse, with no reliable molecular markers for progression-free survival (PFS) available. As chemotherapy primarily eliminates cancer cells by apoptosis, we here evaluated if the expression of key apoptosis regulators (Bax, Bak, Bcl-2, Bcl-xL, Smac, Procaspase-9, Apaf-1, Procaspase-3 and XIAP) allows prognosticating PFS in stage III/IV melanoma patients. Following antibody validation, marker expression was determined by automated and manual scoring of immunohistochemically stained tissue microarrays (TMAs) constructed from treatment-naive metastatic melanoma biopsies. Interestingly and counter-intuitively, low expression of the pro-apoptotic proteins Bax, Bak and Smac indicated better prognosis (log-rank p < 0.0001, p = 0.0301 and p = 0.0227 for automated and p = 0.0422, p = 0.0410 and p = 0.0073 for manual scoring). These findings were independently validated in the cancer genome atlas (TCGA) metastatic melanoma cohort (TCGA-SKCM) at transcript level (log-rank p = 0.0004, p = 0.0104 and p = 0.0377). Taking expression heterogeneity between the markers in individual tumour samples into account allowed defining combinatorial Bax, Bak, Smac signatures that were associated with significantly increased PFS (p = 0.0002 and p = 0.0028 at protein and transcript level, respectively). Furthermore, combined low expression of Bax, Bak and Smac allowed predicting prolonged PFS (> 12 months) on a case-by-case basis (area under the receiver operating characteristic curve (ROC AUC) = 0.79). Taken together, our results therefore suggest that Bax, Bak and Smac jointly define a signature with potential clinical utility in chemotherapy-treated metastatic melanoma.
journal_name
Cell Death Disjournal_title
Cell death & diseaseauthors
Guttà C,Rahman A,Aura C,Dynoodt P,Charles EM,Hirschenhahn E,Joseph J,Wouters J,de Chaumont C,Rafferty M,Warren M,van den Oord JJ,Gallagher WM,Rehm Mdoi
10.1038/s41419-020-2309-3subject
Has Abstractpub_date
2020-02-13 00:00:00pages
124issue
2issn
2041-4889pii
10.1038/s41419-020-2309-3journal_volume
11pub_type
杂志文章abstract::We recently reported that microRNA (miR)-145 is downregulated and induces apoptosis in human bladder cancer cells. Also, it is suggested that the ectopic expression of miR-145 induces apoptosis with the induction of TRAIL expression in several cancer cells. Here, we demonstrated a novel mechanism of apoptosis inductio...
journal_title:Cell death & disease
pub_type: 杂志文章
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journal_title:Cell death & disease
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journal_title:Cell death & disease
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journal_title:Cell death & disease
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journal_title:Cell death & disease
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journal_title:Cell death & disease
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