Renal Cancer Genome Evolution. Charles Swanton MD PhD KCA 2014 UCL Cancer Institute and CR-UK Translational Cancer Therapeutics Laboratory
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2 Renal Cancer Genome Evolution Charles Swanton MD PhD KCA 2014 UCL Cancer Institute and CR-UK Translational Cancer Therapeutics Laboratory
3 Implications for Therapy and Outcome Intertumour Heterogeneity Intratumour Heterogeneity Intercellular Heterogeneity Achieving cures in metastatic disease Cost of cancer drug development Cancer biomarker validation Burrell, Mcgranahan, Bartek and Swanton Nature 2013
4 Branched Evolution in ccrcc Primary Mets Ubiquitous Shared Primary Shared Mets Private 65% mutations are heterogeneous and not present in every biopsy Gerlinger, Rowan, Horswell, Larkin et al NEJM 2012
5 Gerlinger et al Nature Genetics 2014 Branched Evolution in ccrcc
6 Microevolution: Gradualism Darwin argued that nature never makes jumps : natura non facit saltum Profound change is the result of a slow but continuous processes Gradual accumulation of small mutations as drivers of change (Neo-Darwinism)
7 Challenge Cancer Macroevolution
8 Macroevolution: Hopeful Monsters Goldschmidt argued that large changes in evolution were caused by macromutations Chromosomal rearrangements result in Macroevolutionary leaps Speciation Rare events resulting in profound change: Hopeful monsters
9 Macroevolution and Hopeful Monsters macroevolution must proceed by a different genetic method. Only the arrangement of the serial chemical constituents of the chromosome into a new, spatially different order; ie. A new chromosomal pattern, is involved. Goldschmidt Material Basis of Evolution 1960 Fig 35 Simple types of chromosomal rearrangements
10 Patterns of Cancer Chromosomal Rearrangements Structural CIN Numerical CIN Chromoplexy (Garraway) Chromothripsis (Campbell/Meyerson) Single chromosome fragmented and reassembled Genome Doubling (Storchova) Generates Profound Cell-to-Cell heterogeneity: fuel for phenotypic change (Pavelka Nature 2010)
11 Intra-metastatic Heterogeneity Driven by Chromosomal Instability
12 Primary Tumour Regions Metastatic Sites Bottlenecking at Metastatic Sites Is there a Substitute for Diversity? Only somatic mutations with with >20x >20x coverage coverage were included Gerlinger and Swanton BJC 2010
13 Primary Tumour Regions Metastatic Sites Ploidy Analysis of Patient 001 Nephrectomy Tetraploid intermediate in Region 4: Aneuploid progeny at metastatic sites R9 Chest Wall Metastasis M2a,b Perinephric Metastasis M1 Only somatic mutations with with >20x >20x coverage coverage were included
14 Primary Tumour Regions Metastatic Sites Allelic Imbalance Region 4 has Doubled its Genome R9 Only somatic mutations with with >20x >20x coverage coverage Chromosome were included
15 Primary Tumour Regions Metastatic Sites Intra-Metastatic Tumour Heterogeneity driven by Chromosomal Instability R9 Chest Wall Metastasis M2a,b Perinephric Metastasis M1 Only somatic mutations with with >20x >20x coverage coverage were included
16 Intra-tumour heterogeneity Chromosomal Instability and Poor Clinical Outcome Cancer Type Method of measuring CIN CIN associated with Reference Lung cancer (NSCLC) FISH (n=63) Poor prognosis (OS & DFS) Choi et al. (2009) FISH (n=47) Poor prognosis (OS) Yoo et al. (2010) FISH (n=50) Poor prognosis (OS) Nakamura et al. (2003) 12-gene genomic instability signature (n=647) Poor prognosis (OS) Mettu et al.(2010) CIN70 signature (n=62) Poor clinical outcome Carter et al. (2006) Breast cancer SSI (n=890) Poor prognosis (OS) Kronenwett et al. (2004) SNP (n=313) Poor prognosis (MFS) Smid et al. (2010) 12-gene signature (n=469) Poor prognosis (DFS & RFS) Habermann et al.(2009) CIN70 signature (n=1866) Poor clinical outcome Carter et al. (2006) FISH (n=31) Lymph-node metastasis and ER negativity Takami et al.(2001) Myelodysplastic syndrome FISH (n=65) Poor prognosis (DFS) Heilig et al.(2010) Endocrine pancreatic tumors CGH (n=62) Metastasis Jonkers et al.(2005) Colon cancer 12 gene genomic instability signature (n=92) Recurrence Mettu et al. (2009) Flow cytometry/ image cytometry (n = ) Poor prognosis Walther et al.(2008) Ovarian cancer 12-gene genomic instability signature (n=124) Poor prognosis (RFS) Mettu et al.(2010) Endometrial cancer SNP (n=31) Poor prognosis (OS) Murayama-Hosokawa et al. (2010) Synovial sarcoma CGH (n=22) Poor prognosis (OS) Nakagawa et al.(2006) Oral cancer FISH (n=77) Poor prognosis (OS & DFS) Sato et al.(2010) (SCCs) FISH (n=20) (loco)regional tumour outgrowth Bergshoeff et al. (2008) Diffuse Large B-cell Lymphoma Anaphase segregation errors Poor prognosis (RFS) Bakhoum et al. (2011) (n=54) Abbreviations: NSCLC, non-small cell lung cancer; SCC, squamous cell carcinoma; FISH, fluorescence in situ hybridization; SSI, stem line scatter index; CGH, comparative genome hybridisation; SNP, single-nucleotide polymorphisms; OS, overall survival; DFS, disease-free survival; MFS, metastasis-free survival; RFS, relapse free survival Mcgranahan, Burrell and Swanton EMBO Rep 2012
17 Opportunities for Clinical Trial Development Define Actionable Mutations by Clonal Dominance Marco Gerlinger Stuart Horswell, James Larkin, Max Salm, Nik Matthews
18 Target Tumour Phylogenetic Trunks and Resolve Branches Branched Genetic Events Present in Some Cancer Cells not others Dynamic during disease course Monitor subclonal events to define drug resistance mechanisms Trunk Genetic Events Present in Every Cancer Cell DEFINE and TARGET TRUNK DRIVERS
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21 How can trunk clonally dominant events be identified? Are single biopsies sufficient?
22 Illusion of Clonal Dominance from a Single Biopsy Variant Allele Frequencies All Drivers have Similar Variant Allele Frequencies to VHL
23 Illusion of Clonal Dominance from a Single Biopsy Variant Allele Frequencies All Drivers have Similar Variant Allele Frequencies to VHL
24 Illusion of Clonal Dominance from a Single Biopsy Variant Allele Frequencies PTEN, PBRM1, ATM clonally dominant mutations in R8 Absent in R10. R3 and Vena Cava Thrombus (VT)
25 Illusion of Clonal Dominance from a Single Biopsy Variant Allele Frequencies PTEN, PBRM1, ATM clonally dominant mutations in R8 Absent in R10. R3 and Vena Cava Thrombus (VT) MSH6 PBRM1 ATM PTEN PBRM1 ARID1A SMARCA4 VHL is the only clonally dominant driver in all tumour regions Multi-region sequencing distinguishes clonally dominant from subclonal drivers VHL
26 Regional allopatric Separation of Subclones Primary Tumour Liver metastasis SETD2 (frameshift) PTEN (S/S) PTEN (S/S) SETD2 (missense) TP53 VHL PBRM1 SETD2 (frameshift) PTEN (splice site) PTEN (missense) SETD2 (missense) TP53 PTEN (missense) Patient 002 PTEN (S/S) Minimal intermixing of subclones: Deep Sequencing >500x fails to resolve subclonal diversity
27 Subclonal Driver Heterogeneity Confounding treatment success?
28 Drivers Spatially Separated Drivers not always trunk-al but can be spatially separated in the branches Sampling Bias Relationships between heterogeneous events and therapeutic failure? Dynamics of heterogeneous events/branches over time? Single biopsy underestimates number of driver events in ccrcc
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30 Number of Driver Events under-estimated by Single Biopsy in ccrcc Driver Prevalence Per Biopsy TCGA n=164 Per Biopsy n=79 Per Patient n=10 P53 5% 5% 40%
31 How can the genomic landscape be more efficiently mapped?
32 Tracking Tumour Subclonal Architecture Dynamics Somatic mutation detection in ctdna extracted from peripheral blood. Ion Torrent PGM PCR amplify ubiquitous/ heterogenous mutations X DEPTH Regional Distribution Gene Variant Frequency Ubiquitous VHL 1.2% R3, R6, R9 PTEN (splice) 3.7% R3, R6, R9 ARHGEF7 0.9% R3 SYNM 0.1% R7 MGA 0.1% R4 OR10H3 0.1% M SETD2 6.3% M TP53 0.2% Marco Gerlinger and Andrew Rowan
33 Exploit Convergence of Driver Events
34 Evidence for Parallel Evolution SETD2 Loss of Function: H3K36 tri-methylation KDM5C missense and F/S Normal KDM5C splice site Branch length proportional to number of NS mutations from branch point 3 distinct SETD2 mutations associated with loss of function: Mutational capacity?
35 Genetic Heterogeneity may affect the same Protein Complex in different branches SWI/SNF Chromatin remodeling Complex PBRM1 PBRM1 and ARID1A SMARCA4 / BRG
36 Disruption of the mtor Pathway A Common Convergent Event
37 Number of Driver Events under-estimated by Single Biopsy in ccrcc Pathway Prevalence Per Biopsy TCGA n=164 Per Biopsy n=79 Per Patient n=10 mtor pathway
38 Genetic Heterogeneity may affect the same Signaling Pathway in different branches PTEN PTEN PIK3CA PTEN mtor PIK3CA Genetic heterogeneity may impact the same signalling pathway in different branches PI3K/PTEN/mTOR
39 Genetic Heterogeneity commonly affects the same Driver in different branches 6/10 Tumours have recurrent mutations in the branches in the same gene PIK3CA, PTEN, SETD2, KDM5C, BAP1, PBRM1
40 Target Tumour Phylogenetic Trunks and Resolve Branches Target convergent events in the branches Target lethal subclone(s) Trunk Genetic Events Present in Every Cancer Cell DEFINE and TARGET TRUNK DRIVERS
41 Subclonal SCNA Heterogeneity Confounding treatment success?
42 Trunk and Branched SCNAs
43 SCNAs Mapped to Phylogenetic Trees
44 Tumour Sampling Bias Difficulties of identifying uniform biomarkers
45 Heterogeneous Nature CCB Poor Prognostic Signature and CCA Good Prognostic Signature
46 Mapping the Genomic Landscape of ccrcc How deep is the rabbit hole?
47 How many biopsies to fully map the number of driver events? Number of driver events Number of driver events Number of biopsies Number of biopsies
48 Clinical Implications of Driver Heterogeneity >70% of Drivers are heterogeneous and spatially separated (BAP1, SETD2, PBRM1, KDM5C, MTOR, PIK3CA, PTEN, TSC2, TP53) Subclonal drivers cannot be readily distinguished in single biopsies Current sampling techniques are underestimating number of driver events in RCC Similar trunk driver events but diverse patient outcomes: Branches and subclonal drivers are likely to influence outcome
49 Tumour Evolution Constraints or Contingency? Rosalie Fisher, James Larkin, Stuart Horswell
50 Constraints and Contingencies in Tumour Evolution Stephen Jay Gould argued for the radical contingency of the human species. Wind back the tape of life to the early days of the Burgess Shale; let it play again from an identical starting point, and the chance becomes vanishingly small that anything like human intelligence would grace the replay To what extent would two or more tumours sharing the same initiating event in the same host and environment resemble each other? How constrained is cancer evolution? Does radical contingency apply to cancers? Are there multiple routes for tumour evolution? Study cancer evolution in the context of ccrcc tumours in a VHL syndrome patient
51 26 yr old male germline VHL mutation Right radical nephrectomy November 2011 Stage III clear cell RCC TUMOUR 1 Cyst Regions 2,3,4,6,7 2 1 TUMOUR 2 Regions Coronal anterior view right kidney
52 Left partial nephrectomy August 2012 Stage I clear cell RCC TUMOUR 3 Regions 1-8 TUMOUR 4 Region 9 Coronal anterior view left kidney
53 Germline VHL Syndrome Tumours: No evidence of branched evolution
54 Second Hit: 3p Loss distinct in each of the 4 Tumours
55 All Tumours Have Distinct Set of Drivers: Contingent on Distinct 3p Loss?
56 Constraints to Cancer Evolution : 2 mtor mutations in 2 left kidney tumours
57 Distinct MTOR mutations in the two left sided tumours T1652 kinase N-lobe Mg-ATP FRB domain L2427 kinase C-lobe activation-loop Kinase domain mutation glycine loop ATP Mg Mg DFG L2427 FAT domain FATC mlst8 T1652 FAT domain mutation; functional significance uncertain Neil McDonald
58 mtor Pathway Activity in all tumours
59 TRACERx TRAcking Cancer Evolution through Therapy (Rx)
60 Functional and Genetic Intratumour Heterogeneity Optimise Clinical trial development: Target Trunk vs Branched drivers Exploit constraints to cancer evolution parallel evolutionary events converging on single genes or pathways Define relationships between diversity, clinical stage and cancer outcome Autopsy Programs: Define the origins of the lethal subclone Impact of therapy on cancer genome evolution Develop non-invasive methods to monitor cancer evolution: cfdna Identify sequence of somatic events in relation to genome instability onset: Define drivers of diversity and genome instability in tumours
61 Renal Cancer Evolution Summary - Need to address two principles of Darwinian evolution - Decipher mechanisms of cancer diversity - Improve cancer selection pressures: - Target Clonal Driver VHL loss of function, - Resolve subclonal dynamics - Understand evolutionary pressures resulting in parallel evolution of subclones - Develop better animal models of ccrcc - Longitudinal cancer cohort studies (TRACERx): reveal processes shaping tumour genome evolution - Define Origins of lethal subclone
62 CR-UK TCT Lab Marco Gerlinger Andrew Rowan Pierre Martinez Nicholas Mcgranahan Rebecca Burrell Sally Dewhurst Eva Gronroos Andy Crockford Claudio Santos Carlos Garcia Su Kit Chew Maria Cerone Mariam Jamal-Hanjani Elza De Bruin Nnenna Kanu Seema Shafi Royal Marsden/UCLH/GKT James Larkin Rosalie Fisher Gordon Stamp Lisa Pickering Lynda Pyle Steve Hazell Martin Gore David Nicol Tim O Brien Rosalie Fisher IGR Fabrice Andre Bernard Escudier Stephane Oudard CR-UK Advanced Sequencing Nik Matthews Sharmin Begum Ben Phillimore Adam Rabinowitz CR-UK Bioinformatics Aengus Stewart Stuart Horswell Richard Mitter Max Salm - Postdoc/Clinician Scientist opportunities charles.swanton@cancer.org.uk
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