Sid Sijbrandij
Cancer Journey
Please email me if you want to look beyond the standard of care. I work with two full time people to follow up with everyone.
Feel free to share this presentation and above url with anyone
SID SIJBRANDIJ | CANCER JOURNEY
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Living the American dream after IPO'ing GitLab in 2021
SID SIJBRANDIJ | CANCER JOURNEY
In 2022 I had pain while bench pressing, 6cm osteosarcoma
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END OF 2022
Became the start of a journey
SID SIJBRANDIJ | CANCER JOURNEY
Standard of care treatment for osteosarcoma (bone cancer)
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START OF 2023
SID SIJBRANDIJ | CANCER JOURNEY
Also in 2022 Click chemistry won a nobel prize
SID SIJBRANDIJ | CANCER JOURNEY
In 2017 I invested in click-chemistry for cancer in 2023 I took it
Single Patient IND
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Since 2017 I invested in a company called Shasqi that uses click-chemistry to target cancer treatments.
Because biotech didn't believe in them I become their biggest shareholder but now I was becoming a patient as well!
This way my first single patient IND treatment. Opening my mind to what is possible outside of the standard of care.
SID SIJBRANDIJ | CANCER JOURNEY
It came back locally and there was no treatment or trial
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2024
No trails available: My rare disease and rare HLA-type didn't qualify for any trials: It was time to step up and take charge of my own care…
My oncologist: “I have no more drugs I would recommend. Maybe you can find a trial.”
SID SIJBRANDIJ | CANCER JOURNEY
I'll talk to anyone, I'll go anywhere, and I can be there anytime.
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SID SIJBRANDIJ | CANCER JOURNEY
I went founder mode on my cancer
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Maximal Diagnostics
Making Treatments
Treatments in Parallel
Scaling for Others
Elliot Hershberg coined the 'founder mode' with https://centuryofbio.com/p/sid
SID SIJBRANDIJ | CANCER JOURNEY
Maximal Diagnostics, test even if unsure how to action
35TB of data publicly available on https://osteosarc.com/
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SINGLE CELL SEQUENCING
DNA / RNA SEQUENCING
PATHOLOGY STAINING
FREQUENT BLOOD TESTING
DRUG RESPONSE
TARGETED PET SCANS
SID SIJBRANDIJ | CANCER JOURNEY
Passersby at AACR made a world model based on my scRNA
SID SIJBRANDIJ | CANCER JOURNEY
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Developing 10+ personalized drugs and diagnostics
Personalized TCR-T cell therapy
Personalized cancer vaccines (mRNA, DNA, peptide)
Custom binder for target found in my tumor (PANX3)
Personalized CAR-T cell therapy
Personalized radiodiagnostics
Custom antibody-drug conjugates targeting my tumor
Note: I didn't develop most of the drugs I ended up taking.
SID SIJBRANDIJ | CANCER JOURNEY
I did many treatments in Parallel, not Serially
Treatments are usually tested one at a time
Most people run out of time as cancer spreads before finding a cure.
I'd rather die from side effects than from cancer
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"If it works, we won't know what cured you."
SID SIJBRANDIJ | CANCER JOURNEY
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The basics are not prohibitively expensive
Bulk RNA sequencing starting at $50
(and scale for deeper profiling)
Whole genome sequencing starting at $500
AI tools are very capable and $20+ per month
Many chemotherapies are available as low-cost generics
SID SIJBRANDIJ | CANCER JOURNEY
Helping people look beyond standard of care
Book a free call online with one of our two team members who are available fulltime to help patients see what is available beyond the standard of care.
Poornima Parameswaran, Ph.D.
Bayli DiVita Dean, Ph.D.
SID SIJBRANDIJ | CANCER JOURNEY
Also see https://www.evenone.ventures/
I started 15 companies in 15 months to increase access
Custom protein and peptide therapies in oncology
Personalized mRNA cancer vaccines
Cancer
Biology-matched, non-hormonal treatment exploration for endometriosis
Women’s Health
Rescuing drugs
Rescuing shelved oncology assets
Biobanking
Maximum Optionality
Diagnostics
Maximum Profiling
Monitoring
Biomarker-driven radiodiagnostics
Deep immune profiling & combination therapeutics for unresolved immune disorders
Autoimmune
AI Agents
Personalized bioinformatics
Yuga
Rare disease
Relit
Personalized oncolytic viruses
Minuteman
Comprehensive functional drug testing
Personalized ASOs
Stitchpoint
Rarivive
Perita
Personalized gene editing
Ignitus
Measure and restore mitochondrial energy capacity
Cardiovascular/Longevity
Personalized TCR cancer therapies
SID SIJBRANDIJ | CANCER JOURNEY
Make the industry more Patient First
SID SIJBRANDIJ | CANCER JOURNEY
I currently have no evidence of disease
BUILDING "THERAPEUTIC LADDER" OF BACKUP TREATMENTS
MRNA NEOANTIGEN VACCINE
MULTIPLE MRD TESTS
ONGOING SURVEILLANCE
SID SIJBRANDIJ | CANCER JOURNEY
My therapeutic ladder went from 0 to ~25 treatments
Consider while MRD low / negative
MRD increasing
(by ctDNA or positive margins)
Local progression
Metastatic progression
Current / planned treatments
SID SIJBRANDIJ | CANCER JOURNEY
How we found a target and picked radioligand therapy
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SINGLE CELL SEQUENCING
DNA / RNA SEQUENCING
PATHOLOGY STAINING
FREQUENT BLOOD TESTING
DRUG RESPONSE
TARGETED PET IMAGING
SID SIJBRANDIJ | CANCER JOURNEY
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Identifying cancer cells from single cell sequencing
Putative tumor cells
SID SIJBRANDIJ | CANCER JOURNEY
Comparing tumor and normal tissue reveals signal
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Integrated my tumor with public normal tissue to identify tumor-speficic genes
My cancer cells express a strong fibroblast-like program
SID SIJBRANDIJ | CANCER JOURNEY
Fibroblast program points to FAP as a target
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YES
Decision at stake: To fly to Germany for experimental radiotherapy?
YES
SID SIJBRANDIJ | CANCER JOURNEY
Radiotherapy with FAP in Germany
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SID SIJBRANDIJ | CANCER JOURNEY
Radiotherapy with FAP in Germany
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SID SIJBRANDIJ | CANCER JOURNEY
Cancer responded, enabling surgery
Its gone!
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f
SID SIJBRANDIJ | CANCER JOURNEY
T-cell infiltration increased dramatically!
June 2024
Jan 2025
Apr 2025
Single Cell RNA Seq
tumor
tumor
tumor
T cells
T cells
T cells
June 2024: Aggressive Multimodal “Pre-Treatment”
Systemic and localized chemo-SBRT phase → Massive tissue damage and inflammation
Neoantigen vaccines → Early immune priming
Short course of PD-1 inhibitor
Jan 2025: 5 immunotherapies in parallel!
Apr 2025: Precision Targeted + Immunotherapy. Stromal targeting.
177Lu and ²²⁵Ac-FAPi → Targeted radiotherapy against fibroblasts
SID SIJBRANDIJ | CANCER JOURNEY
Personalized mRNA Vaccine
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DNA / RNA SEQUENCING
PATHOLOGY STAINING
FREQUENT BLOOD TESTING
DRUG RESPONSE
TARGETED PET IMAGING
SINGLE CELL SEQUENCING
SID SIJBRANDIJ | CANCER JOURNEY
Neoantigens ranked based on available data and algorithms
SID SIJBRANDIJ | CANCER JOURNEY
From project start
to injection in 6 months!
SID SIJBRANDIJ | CANCER JOURNEY
Flow cytometry shows active T cells
SID SIJBRANDIJ | CANCER JOURNEY
Blood monitoring for tumor and immune signals
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Vaccine
Neoantigen
Discovery
Monthly Blood Review
Flow cytometry panel
TCR Sequencing
MRD Testing
“Complete blood count” through high parameter flow cytometry. Distribution of immune cell types in PBMCs and sorting of T cells for further analysis
Single cell sequencing of T cells to measure abundance of specific clones (TCR-T or neo- antigen related, and other) and T cell phenotype. Bulk TCRseq to get full distribution of TCRs
Signatera, Personalis & Billion-to-one to measure ctDNA in blood. Exploring circulating tumor cell, RNA-based, and protein-based strategies as well.
SID SIJBRANDIJ | CANCER JOURNEY
Creating a Personalized TCR-T
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SINGLE CELL SEQUENCING
DNA / RNA SEQUENCING
PATHOLOGY STAINING
FREQUENT BLOOD TESTING
DRUG RESPONSE
TARGETED PET IMAGING
SID SIJBRANDIJ | CANCER JOURNEY
TCR-T process
Discovery & Verification Workflow
Collection �of tumor biopsy & blood or other T-cell containing samples
Prediction & Prioritization�of targets from tumor mutation sequencing and vaccine design
neoTCR Identification�using binding or functional screens on T cells from patient sample
Functional Verification �of neoTCR hits to prioritize for product selection
Product Selection�of 1 or more neoTCRs considering:
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SID SIJBRANDIJ | CANCER JOURNEY
See expansion of relevant clones in single cell data
scRNAseq Clustering by Cell Phenotype (T2 Biopsy)
CD8 T cells
Proliferating
CD8 T cells
scRNAseq Clustering by Cell Phenotype (T3 Resection)
Proliferating
CD8 T cells
CD8 T cells
SID SIJBRANDIJ | CANCER JOURNEY
Selecting TCRs for therapy
Item | Criteria | Rationale | P01-F02 DYNC1H1 | P01-G10 DYNC1H1 | P02-A07 DYNC1H1 | D3 or F3 TECPR1 |
1 | TCR comes from antigen experienced T cell | Memory T cell has been selected in vivo and supports safety profile of TCR-T product | Memory phenotype | + | + | TBD |
2 | TCR comes from T cell showing tumor trafficking | T cell present (and expanded) in TIL population or recently trafficked through tumor supports tumor relevant targeting | Present and expanded in TILs | - | - | - |
3 | TCR targets truncal or high prevalence neoepitope expressed in most recent tumor biopsy | Increases likelihood that TCR-T product will be functional in patient | DYNC1H1 (high prevalence) | + | + | TECPR1 (truncal) |
4 | TCR targets HLA with no evidence of LOH | TCR requires HLA expression on tumor for function | C*07:01 | + | B*27:05 (phased) | TBD |
5 | Evidence of multiple clonotypes generated by immune response | More clonotypes suggest a more robust immune response | At least 8 clonotypes identified | + | - (only one) | TBD |
6 | TCR shows strong EC50 for neoepitope and little response to wild-type peptide | TCR will be potently activated by presented peptide with little to no off-tumor safety issues | 0.12 nM EC50 | + (0.05 nM EC50) | - (43 nM EC50) | TBD |
7 | TCR is CD8-independent | TCR will recognize tumor cells when edited into both CD4 and CD8 T cells | YES | + | - | TBD |
8 | TCR kills multiple target cells pulsed with both minimal and long peptide when target cells in excess to T cells | Serial killing of target cells indicates potency while killing of long peptide-pulsed target cells suggests physiological antigen processing and presentation | ~80% killing at 1:4 E:T ratio | + (~80% killing) | - (~45% killing) | TBD |
SID SIJBRANDIJ | CANCER JOURNEY
Functional screening
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SINGLE CELL SEQUENCING
DNA / RNA SEQUENCING
PATHOLOGY STAINING
FREQUENT MRD TESTING
DRUG RESPONSE
TARGETED RADIO DIAGNOSTICS
SID SIJBRANDIJ | CANCER JOURNEY
Drug Response Testing with organoids (functional testing)
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SID SIJBRANDIJ | CANCER JOURNEY
Organoid testing for additional options
January 2025 biopsy testing
SID SIJBRANDIJ | CANCER JOURNEY
T cell functional response to checkpoint inhibitors
SID SIJBRANDIJ | CANCER JOURNEY
MDM2 as targeted therapy
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SINGLE CELL SEQUENCING
PATHOLOGY STAINING
FREQUENT MRD TESTING
TARGETED RADIO DIAGNOSTICS
DRUG RESPONSE
DNA / RNA SEQUENCING
SID SIJBRANDIJ | CANCER JOURNEY
Very high regional expression around MDM2
SID SIJBRANDIJ | CANCER JOURNEY
Tumor MDM2 expression is in top 0.3% of all cancers (comparing 2600 tumors)
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SID SIJBRANDIJ | CANCER JOURNEY
MDM2 expression much higher than predicted by copy-number.
I recently prevented a drug targeting it from being destroyed by the manufacturer!
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SID SIJBRANDIJ | CANCER JOURNEY
CAR-T Program
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SINGLE CELL SEQUENCING
DNA / RNA SEQUENCING
PATHOLOGY STAINING
FREQUENT MRD TESTING
DRUG RESPONSE
TARGETED RADIO DIAGNOSTICS
SID SIJBRANDIJ | CANCER JOURNEY
B7-H3 as a seemingly good target…
Put together a CAR-T product featuring the latest scientific advances!
SID SIJBRANDIJ | CANCER JOURNEY
… but Beijing scan spooked us about liver tox
SID SIJBRANDIJ | CANCER JOURNEY
Now we are building a SNIPR system
SID SIJBRANDIJ | CANCER JOURNEY
Investing in PANX3 as a potentially very clean target
By RNA, PANX3 is:
SID SIJBRANDIJ | CANCER JOURNEY
SID SIJBRANDIJ | CANCER JOURNEY
Sid Sijbrandij
Cancer Journey
Please email me if you want to look beyond the standard of care. I work with two full time people to follow up with everyone.
Feel free to share this presentation and above url with anyone
Thank you!
SID SIJBRANDIJ | CANCER JOURNEY