Abstract
Background: Germline variants have traditionally been used for determining carrier status
in heritable cancer families. However, studies are increasinglyfinding use of germline
variants as therapeutic, diagnostic and prognostic biomarkers used to guide therapy
decisions in cancer treatment.
Objectives
T o study the prevalence of mutation specific oncogenic biomarkers in the
Indian population and analyze their presence across disease cohorts
Materials and methods
We annotate the IndiGen data obtained from whole genome
sequencing of 1029 self-declared healthy Indian individuals with biomarker information
obtained from the OncoKB knowledgebase, a repository of evidence-based information
about somatic biomarkers and structural alterations in patient tumors.
Results
In our study we have discovered 34 biomarker variants of therapeutic
actionability across 16 genes linked with 23 unique drugs or drug combinations in 23
unique types of cancer disease in the Indian population. In all, we have found 52
biomarker variants with 172 different biomarker types including therapeutic,
resistance, diagnostic, and prognostic. We establish that 4.3% of the Indian
population are carriers of therapeutic, and 2.13% are carriers of both diagnostic as
well as prognostic germline biomarkers. Finally, we also establish the prevalence of
42 biomarker variants across the 23 genes in both AD and AR modes of inheritance
in the Indian population.
Keywords
Precision Medicine, Germline, Leukemia, Inherited susceptibility, Epidemiology,
Genetic testing, NGS, Genomic Biomarkers
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Introduction
Traditionally, germline variants in cancer have been studied mainly as predisposition
biomarkers for surveillance and early detection of hereditary cancers. However,
germline mutations can also determine response to both targeted, as well as
traditional cancer therapy, including its toxicity. As Next-generation sequencing
becomes increasingly accessible, several recent studies have highlighted the
importance of studying germline variants as therapeutic markers. Several recent
studies have observed germline mutations in cancer predisposition genes in
sporadic cases with no family history of cancer 1. Similarly, a pan-cancer analysis in
2017 demonstrated that approximately 17% of patients with advanced cancer had a
pathogenic/likely pathogenic germline variant in a cancer susceptibility gene, with
more than a quarter of these leading to consideration of change in therapy2.
The germline mutation burden is also observed to be high among pediatric cancer
cases; A pan-cancer pediatric cohort analysis found that 6% of all patients carried
causative germline variants, with 3% of all therapeutic biomarkers having a germline
origin, with another pediatric study (CNS tumors) finding that 89% of participants
harbored pharmacogenetic variants 2. Additionally, pathogenic germline mutations
have also been noted in a substantial number of sporadic pediatric cancer cases1.
Thus application genomics is increasingly enabling the determination of the true
burden of pathogenic germline mutations with therapeutic potential.
A common example of a biomarker-indicated drug is PARP inhibitors, approved for
the treatment of metastatic breast cancer in germline BRCA mutation carriers 3.
Since germline mutations are clonal in nature (while a somatic mutation may be
clonal as well as subclonal), a drug targeting a large clonal population has a higher
chance of affecting a larger population of tumor cells, making it more important to
study therapeutic implications of germline mutations 4. Research efforts have also
established variants as indicators of drug resistance/tolerance, ef ficacy, and toxicity
(e.g. 5- fluorouracil related toxicity) 4. Additionally, biomarkers can also offer
diagnostic and prognostic value. Perhaps the most common example is the
BCR-ABL1 fusion, which can used both for diagnosis of B-Lymphoblastic
Leukemia/Lymphoma, and is also linked with a poor prognosis of the disease.
Finally, the presence or absence of germline variants can guide surgical decisions
(e.g. whether to perform mastectomy in women with BRCA1/2 mutations), as well as
prophylactic decisions such as chemoprevention (e.g. prophylactic use of aspirin in
carriers of Lynch syndrome)4,5.
In this study we utilize data from OncoKB 6, a precision oncology knowledgebase
that offers evidence-based information about somatic mutations and structural
alterations in patient tumors, for annotating the IndiGen7 data, a database containing
whole genome sequencing data of 1029 self-declared healthy Indian individuals
from across 27 states. Using the resulting information, we calculate the prevalence
of onco-biomarkers in the Indian population. We also query GUaRDIAN 8, a
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nation-wide collaborative research initiative dedicated to the study of rare diseases
to establish the presence of biomarkers across multiple cohorts. Finally, we compare
our results with those obtained by cross referencing the MUST ARD 9 resource, a
database of mutation-specific therapies in cancer.
Materials and methods
Biomarker Classification Based on Evidence-Based Clinical Actionability
We collected a list of 737 biomarker genes from the OncoKB database, and queried
this list across the IndiGen compendium. We thus collected all germline variants
reported across these biomarker genes. Next, using OncoKB API, we annotated this
variant data with information regarding their biomarker status; OncoKB classi fies
variants into 4 main evidence based levels, each with several sub-levels of varying
strength:
Therapeutic (Levels 1-7): Biomarkers predictive of response or resistance to a drug
Diagnostic (Levels 1-2): Biomarkers that facilitate diagnosis
Prognostic (Levels 1-3): Biomarkers that facilitate prognosis
FDA (Levels 1-3): Categorization of genetic tests by the FDA based on different
levels of clinical significance
Population Based Prevalence Analysis
We mapped global as well as subpopulation allele frequencies across all variants
that had OncoKB annotations. We queried 14 global populations including IndiGen,
GnomAD10, Human Genome Diversity Project (HGDP) 11, T ogoVar (Japanese
population)12, the China Metabolic Analytics Project (ChinaMAP) 13, Qatar 14, the
Singapore Sequencing Indian Project (SSIP) 15, the Singapore Sequencing Malay
Project (SSMP)16, 1000Genomes17, the Greater Middle East (GME) Variome Project18,
Korea1K Variome19, Taiwan Biobank20, the Vietnamese Genetic Variation Database21,
and the Iranome 22. We performed the Fisher’s exact test across each of these
populations and sub-populations with respect to the IndiGen population to
determine whether the allele frequencies were signi ficantly different in any
population.
Next, based on the number of individuals who were carriers of any of the biomarkers,
we established the percentage of biomarker carriers in the Indian populations.
Finally, we calculated the incidence and prevalence of both Autosomal Dominant
(AD) as well as Autosomal Recessive (AR) disorders linked with each of the genes
containing the variants with OncoKB annotations in the IndiGen population.
Disease Cohort Comparison
We queried all variants with OncoKB annotations across samples in the GUaRDIAN
project8, a nation-wide collaborative research initiative that caters to rare diseases
across multiple cohorts to determine cohort characteristics.
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Comparison with MUST ARD
We have previously compiled MUST ARD 9, an exhaustive compendium of
mutation-specific therapies in cancer. We queried both mutations as well as
structural variants present in the database across OncoKB, and analyzed the
variants that returned annotations.
Results
& Discussion
From our query of the IndiGen database, we found 17,00,332 variants across
OncoKB biomarker genes. Upon annotating these, we obtained 2 Oncogenic, 330
Likely Oncogenic, 67 Likely Neutral, 32 Inconclusive and 16,99,900 Unknown
variants. Of these 332 Oncogenic / Likely Oncogenic variants, 52 had highest level of
annotations in any 4 of the evidence levels: a total of 34 variants had therapeutic
biomarkers (28 Level 1, 3 Level 3A, 3 Level 4), 17 Diagnostic (11 Level Dx2, 6 Level
Dx3), 11 Prognostic (5 Level Px1, 5 Level Px2, 1 Level Px3), and 34 had FDA levels
(28 FDA Level 2, 6 FDA Level 3). Thus including all levels, 172 biomarker types
(therapeutic, diagnostic, prognostic) were annotated across 27 unique genes,
encompassing 23 unique drugs or drug combinations in 34 unique types of cancer
disease in the Indian population. Complete details of the variants along with their
annotations are shown in Supplementary Table 1.
Variants Classified Based on Therapeutic Actionability
Of the therapeutic biomarkers, we found 34 biomarker variants across 16 unique
genes (Figure 1). These variants included 56 Level 1 associations (de fined as an
FDA-recognized biomarkers predictive of response to an FDA-approved drug), 16
Level 2 associations (de fined as standard care biomarkers recommended by the
NCCN or other professional guidelines predictive of response to an FDA-approved
drug), 23 Level 3A associations (de fined as compelling clinical evidence supporting
the biomarker as being predictive of response to a drug), and 9 Level 4 biomarkers
(defined as compelling biological evidence supporting the biomarker as being
predictive of response to a drug). In all, we discovered the presence of 118
biomarkers (therapeutic, diagnostic, and prognostic) in these 34 variants across 23
unique types of cancer, associated with 23 unique drugs.
Table 1 describes all the diseases and drugs associated with all 13 genes bearing
Level 1 associations.
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Figure 1: Figure describing all therapeutic biomarkers obtained across 34 IndiGen
variants
Gene Variant Disease
A TM
p.Arg337Cys, p. Val519Ile, p.His1380Tyr,
p.Ser1878LysfsT er38,
p.Asn2567LysfsT er3,
p.Asp2569ThrfsT er5,
p.Gln2972AsnfsT er14
Prostate Cancer, NOS, Prostate
Cancer
BARD1 p. Val767AspfsT er4
Prostate Cancer, NOS, Prostate
Cancer
BRCA1 p.Lys558ArgfsT er2, p. Val545LysfsT er20Ovarian Cancer, Ovary/Fallopian
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Tube, Peritoneal Serous Carcinoma
BRCA1 p.Lys558ArgfsT er2, p. Val545LysfsT er20
Prostate Cancer, NOS, Prostate
Cancer
BRCA2
p.Asp935IlefsT er25, p.Ile1516AspfsT er13,
p. Val1794HisfsT er14, p.Arg2842Cys
Ovarian Cancer, Ovary/Fallopian
Tube, Peritoneal Serous Carcinoma
BRCA2
p.Asp935IlefsT er25, p.Ile1516AspfsT er13,
p. Val1794HisfsT er14, p.Arg2842Cys
Prostate Cancer, NOS, Prostate
Cancer
BRIP1 p.Arg251Cys
Prostate Cancer, NOS, Prostate
Cancer
CDK12 p. Thr611GlufsT er32, p. Thr1246AsnfsT er25
Prostate Cancer, NOS, Prostate
Cancer
CHEK2 p.His371Tyr, p.Ile157Thr, p.Glu64Lys
Prostate Cancer, NOS, Prostate
Cancer
KIT p.Arg634Gln Gastrointestinal Stromal Tumor
PALB2 p.Leu861TyrfsT er2, p.Glu830SerfsT er21
Prostate Cancer, NOS, Prostate
Cancer
PDGFRA p.His845Arg Gastrointestinal Stromal Tumor
RAD51D p.Ala321ArgfsT er32
Prostate Cancer, NOS, Prostate
Cancer
RET p.Ile852Val Medullary Thyroid Cancer
TSC2 p.Leu826Met, p.Ser1274PhefsT er47 Encapsulated Glioma
T able 1: Table summarizing all Level1 therapeutic associations annotated across 13
genes in the IndiGen data
Population Based Prevalence Analysis
We found 8 variants from 7 genes that were signi ficant across different populations
at p-value 0.05 in the IndiGen
(AF=0.064) and GnomAD Global (AF=0.066) populations. Additionally, it is also
annotated as benign by ClinVar 23. All other variants had AF < 0.05 across all
populations. The plot depicting all non missing allele frequencies for the 52 variants
is shown in Figure 2. The yellow circles mark statistically significant variants.
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Figure 2: Plot depicting comparison between the allele frequencies of different
populations bearing any of the 52 Oncogenic/Likely Oncogenic biomarker variants.
The yellow circles highlight variants of statistical significance (p-value < 0.01)
Next, we calculated the prevalence of biomarkers across the Indian population using
the IndiGen dataset. The variants with OncoKB annotations were linked with 27
genes. The A TM/H1380Y variant was removed from prevalence analyses.
Additionally, 10 more variants had certain samples that did not pass QC, and
calculations were made accordingly. Incidence and prevalence were calculated for
each of the remaining 23 genes for both AD and AR modes of inheritance.
Supplementary Table 2 shows these numbers along with the disorders associated
with the genes according to OMIM24.
Notably, in the ERCC2 gene, 1 in about 85 individuals are expected to be carriers of
pathogenic mutations linked with AD disease with known biomarkers. ERCC2 is
traditionally linked with AR inheritance of Xeroderma pigmentosum (OMIM).
However, ERCC2 mutations increase cisplatin sensitivity in bladder cancer cells, and
can thus be used as a predictive biomarker in Muscle-Invasive Bladder Cancer 25.
Similarly, TP53 is associated with an AD inheritance of Bone marrow failure
syndrome among other cancers (OMIM), and is identi fied as a prognostic biomarker
in several hematological malignancies. For example, TP53-mutated AML is
associated with a lower likelihood of response to conventional chemotherapy and
with poor outcomes, with a median overall survival of 4 to 6 months, and a 2-year
overall survival rate of <10%26.
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In all, 44 Therapeutic (24 Level 1, 7 Level 2, 8 Level 3A and 5 Level 4), 16 diagnostic
and 16 prognostic biomarkers were observed. These mainly encompassed
hematological malignancies (46%), breast and ovarian cancers (13%), prostate
cancers (13%), and Gastrointestinal Stromal Tumors (11.8%). Other malignancies
included pancreatic, Medullary thyroid cancer, Mesenchymal tumors, Uterine,
Bladder, central nervous system, and all solid tumors.
Prevalence in India Population: Nearly 7% of the population (72 unique individuals)
were found to be carriers of any one of the four evidence based biomarkers. Further,
4.3% (44 unique individuals) were carriers of therapeutic, and 2.13% (22 unique
individuals) were carriers of both diagnostic as well as prognostic biomarkers.
Disease Cohort Comparison
We discovered 10 unique variants across 365 samples from multiple cohorts in the
GUaRDIAN data. These included all variants that were determined statistically
significant except BRCA2/R2842C. Of these variants, two were annotated as
diagnostic biomarkers: NOTCH2/M1? Which is a Diagnostic Level3 biomarker for
Splenic Marginal Zone Lymphoma, and SUZ12/D725VfsT er18, a Diagnostic Level3
biomarker for Early T -Cell Precursor Lymphoblastic Leukemia. Of note, the
SUZ12/D725VfsT er18 variant was present in several cohorts that represented
diseases that increase the risk of hematologic malignancies, including Sjögren
syndrome27, Mitochondrial Disorders 28, Immunode ficiency29, Hyper IgE
Syndromes30. The details of all 10 variants are shown in Supplementary Table 3.
Comparison with MUST ARD
We queried the mutations and structural variants present across 168 unique genes
from the MUST ARD database across OncoKB, and found 164 variants (66 Likely
Oncogenic, 96 Oncogenic and 2 Resistance) with annotations across at least one of
4 evidence levels.
194 variants had Therapeutic evidence levels (63 Level 1, 62 Level 2, 8 Level 3A, 16
Level 4, 38 Level R1 and 7 Level R2), 92 had Diagnostic (9 Level Dx1, 55 Level Dx2,
28 Level Dx3), 46 had Prognostic (45 Level Px1, 1 Level Px2), and 149 had FDA level
evidence (100 FDA Level 2, 49 FDA Level 3). The details of the variants along with
their annotations are shown in Supplementary Table 4.
We next mapped all MUST ARD variants against the GUaRDIAN data; we found an
overlap of 5 unique variants in 5 different samples. Two of the 5 variants had Level 1
biomarkers for breast cancer, and also belonged to the breast cancer cohort.
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Conclusions
In our study , we have calculated the prevalence of biomarkers implicated in cancer,
that are of therapeutic, diagnostic and prognostic value in the Indian population.
Some biomarkers such as ones for bladder, prostate and hematological
malignancies are present in high numbers, and the information can be used to
clinical advantage. However, only 23 of the 737 OncoKB genes queried had
biomarkers in the Indian population. This could be because of differences in genetic
makeup between different populations, and indicates a need for increased efforts to
analyze biomarkers in variants prevalent in the Indian populations. Our comparison
with the GUaRDIAN disease cohort data revealed concordance between two
diagnostic biomarkers and their respective cohorts. 9 of the variants further lie in
the top 10 most prevalent biomarker associated genes in the Indian population,
showing further concordance between the two analyses. This illustrates the clinical
advantage of studies like ours, where prevalence estimates can be used
advantageously to guide biomarker research in a population specific manner.
Finally, our mapping of the MUST ARD database with the OncoKB knowledgebase
yielded a greater overlap of variants than with the IndiGen data. Upon mapping
MUST ARD with the GUaRIDIAN data, we found a similar concordance between the
biomarkers and their respective cohorts, despite the small sample size.
Acknowledgements
Authors acknowledge funding from the Council of Scienti fic and Industrial Research (CSIR)
through CNP-0007 Grant. The funders had no role in the preparation of the manuscript or
decision to publish.
Declaration Of Interests
The authors declare no competing interests.
Author Contributions
VS conceptualized, designed and supervised the study.
AV performed the analysis and complied the manuscript.
Data Sharing And Availability
All data produced in the present work are contained in the manuscript.
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