Glioblastoma pathophysiology: or a
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1 Glioblastoma pathophysiology: A or a? M.J. van den Bent The Brain Tumor Center at Erasmus MC Cancer Center Rotterdam, the Netherlands
2 Pathophysiology: pathophysiology seeks to explain the physiological processes or mechanisms whereby such condition develops and progresses Pathophysiology, glioblastoma & Pubmed: 1174 hits, incl Targeting NF-κB in glioblastoma: A therapeutic approach JC polyomavirus in the aetiology and pathophysiology of glial tumours Role of Nitric Oxide in Glioblastoma Therapy: Another Step to Resolve the Terrible Puzzle? The role of ion channels in malignant brain tumors. MicroRNA-1908 functions as a glioblastoma oncogene by suppressing PTEN tumor suppressor pathway. CRMP5 Controls Glioblastoma Cell Proliferation and Survival through Notch-Dependent Signaling. The vacuolar H+ ATPase is a novel therapeutic target for glioblastoma. Intersectin1-S, a multidomain adapter protein, is essential for malignant glioma proliferation.
3 Cancer: bad luck or environment? Variation in cancer risk among tissues can be explained by the number of stem cell divisions : Most Cancers Caused By Bad Luck? Tomasetti, Vogelstein: stem cell divisions correlate with life time risk on cancer. Cancer due to randome mutations in 22:31 cancer types? 1 Wu et al: rates of endogenous mutation accumulation by intrinsic processes are not sufficient to account for observed cancer risks 2 Intrinsic processes Stem-cell division Extrinsic factors Cancer risk 1 Tomasetti et al Science 2015;347:78-81; 2 Wu et al, Nature 2016;529:43-48
4 Hereditary syndromes and glioblastoma Li fraumeni: TP53 mutation: breast cancer, sarcoma, glioblastoma Turcot syndrome: mutations in mismatch repair genes (MSH6): The observed polyposis coli, stability colorectal of brain cancer, glioblastoma incidence in Australia between Cowden 1982 disease: and 2012 PTEN ( ) mutations: suggests Cancers, that the Lhermitte observed Duclos increases in brain cancer incidence in the older age group are unlikely to be (cerebellar gangliocytoma) related to mobile phone use Chapman NF1: et al, neurofibroma, Cancer Epidemiology, glioma May incl , glioblastoma Environment factors and glioblastoma Ionizing radiation
5 Chain of events: Clonal expansions Alterations in intracellular signaling/pathways Precursor cell 1st hit Glioma stem cell Autocrine/paracrine stimulation Driver vs passenger mutations Clonal vs subclonal Changes in the micro-environnement Essential vs non-essential Changes in the microenvironnement Clinical relevance: potential therapeutic targets
6 The cancer stem cell and subclonal expansion: no linear connection
7 Brennan, et al. Cell. 2013;155: TCGA: The Somatic Genomic Landscape of Glioblastoma
8 The TCGA effort: major improvement of the understanding of the complexity of this disease Most glioblastoma are characterized by mutational hits in three major pathways: PI3K pathway, Rb pathway, p53 pathway However: at a multitude of different levels, mutually exclusive (e.g., either PTEN mutation/deletion or PI3K mutation) Another level of biological complexity is revealed by targeted proteomic profile, which showed that the impact of specific genomic alterations on downstream pathway signaling is not linear and not always predictably concordant with genotype Brennan, et al. Cell. 2013;155:
9 Rb and p53
10 Altered cell signalling and hallmarks of cancer: EGFR
11 The hallmark of cancer: six biological capabilities aquired during the multistep development of human tumors. In addition to cancer cells, tumors exhibit another dimension of complexity: they contain a repertoire of recruited, ostensibly normal cells that contribute to the acquisition of hallmark traits by creating the tumor microenvironment. Hanahan, Weinberg Cell 2012
12 Signalling Interactions in the Tumour Microenvironment During Malignant Progression Hanahan D, Weinberg RA. Cell. 2011;144:
13 The microenvironment: another glioblastoma target? Several microenvironmental changes have been used as targets: Inhibition of angiogenesis (bevacizumab, cediranib) Inhibition of integrines (cilengitide) Immunotherapy (rindopepimut, vaccination strategies, PD1 antibodies) Inhibition of matrixmetalloproteinases
14 Immunotherapy and tumors: the immune suppressive tumor Immune system: Checks and balances Remove T-eff PD-L1/PD1 TGF-β, inhibition VEGF (anti-pd1) T effector cell cancer cell Stumulate early T-cell activation CTLA4 CD27/CD70 IL10 Stimulate APC + Vaccination T regulatory cell Immune system Antigen Presenting Cell Dendritic cell MHC class receptors Tumor fragments: proteins Co-stimulatory factors TNF-α, IL1, CD40L/CD40
15 Glioblastoma, a gordian knot? Jean-Simon Berthèlemy: Alexander cutting the Gordian Knot
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