Precision Oncology · mRNA · AI

Personalized
cancer vaccines
at software speed.

Elyra, our AI engine, converts patient tumor sequencing into mRNA vaccine blueprints in days.

Elyra Engine — Active

Personalized cancer vaccines work.
Helixion attacks the design ceiling.

The dark side of the moon, representing the 98% of tumor antigens invisible to current vaccine programs
2%Bright matter
98%Dark matter

We are expanding the target universe to include dark-matter epitopes.

Meet Elyra.

DNA and RNA in. Vaccine blueprint out. In days. Cancer-agnostic by construction.

01

Built on twenty years of
clinical learnings.

Personalized cancer vaccines have been in human trials since the early 2000s. The field knows which features predict immunogenicity, which mutations get presented, and which cassette designs hold up in patients.

02

Continuous improvement,
regression-gated.

The platform gets better with every release without ever drifting backward. Each new dataset, each new feature, each new clinical signal becomes a permanent improvement.

03

Three founders,
expert depth where it matters.

AI does the work that used to need an 80-person department. Three founders steer. The result is a clinical-grade platform built and operated at software-team scale.

Why Now?

Three forces have converged to make this the right moment to build Helixion.

01
mRNA Is Proven
2B+
Doses delivered globally
COVID-19 validated mRNA at global scale. Regulatory frameworks exist. Manufacturing infrastructure is real. The platform works.
02
AI Has Crossed the Threshold
Days
Not months, to design
LLMs can now predict personal neoantigens with high accuracy. The design cost has collapsed. Elyra is possible today.
03
Clinical Signal Has Arrived
8
Personalized vaccines in clinical trials
Personalized vaccines have moved from "interesting hypothesis" to "category with clinical proof." The next thing to crack is design.
The bottleneck is no longer science. It's execution — and that's what Helixion is built for.

This is already happening.

Built & Validated
Pipeline shipping
Built ✓
External benchmark validated
Validated ✓
Three USPTO provisionals filed
Filed ✓
In Flight
In silico head-to-head validation
In Progress
Wet-lab validation
In Progress
Seed close
Next

A clear path forward.

One integrated program. Platform built, validated, and taken into patients with discipline at every step.

Phase I
Now
Platform
  • Elyra validated end-to-end
  • Wet-lab proof-of-concept
Phase II
Next
Clinical
  • IND-enabling studies
  • First patient
Phase III
Then
Scale
  • Phase 1 study
  • Expanded indications
Built → Validated → Into Patients

A rapidly expanding,
underserved market.

Personalized Cancer Vaccine Market (USD Millions)
$350M
2025
$510M
2026
$740M
2027
$1.05B
2028
$1.4B
2029
$1.75B
2030
↑ 44–45% CAGR · 2025–2030
44–45%
CAGR · Fastest-growing biotech segment
$141B
mRNA Therapeutics market by 2030
Software
Economics · Pure computational design layer
98%
Of tumor antigens currently invisible to mutation-only programs

Proven operators.
Repeat founders.
Cross-border experts.

Sean Clark and Marc van der Chijs built Hut 8 together. Dr. Stefanie Mandl-Cashman, formerly CSO at PACT Pharma, brings the neoantigen science. Helixion Therapeutics is their next chapter.

Sean Clark
Sean Clark
Chief Executive Officer & Co-founder
Serial Founder · Public Markets Veteran. CEO of Hut 8 — raised $100M, led TSX public listing. CEO & Founder, First Block Capital — first regulated crypto firm in Canada. Founder, Shoes.com — pioneering Canadian e-commerce. Deep expertise in cross-border capital markets and technology commercialization.
Hut 8 CEOTSX ListingFirst Block CapitalShoes.com
Marc van der Chijs
Marc van der Chijs
Chief Operating Officer & Co-founder
Serial Entrepreneur · Asia & Crypto Pioneer. Co-founder Tudou.com — China's leading video platform, listed NASDAQ, sold to Alibaba. Co-founder Hut 8 Mining — largest Bitcoin miner in North America. 13 years of operational experience across Asia with deep international networks.
Tudou → AlibabaHut 8 Co-founderFirst Block Capital13 Yrs Asia
Dr. Stefanie Mandl-Cashman
Dr. Stefanie Mandl-Cashman
Chief Scientific Officer & Co-founder
Seasoned Biotech Executive · Cancer Immunotherapy. Former CSO at PACT Pharma (first-in-human personalized neoTCR-T cell therapy), CSO at Indapta Therapeutics (adoptive NK cell therapy), and Head of Research at Bavarian Nordic (poxvirus-based cancer vaccines). Co-senior author on two 2023 Nature publications defining the neoantigen-specific TCR-T cell field. PhD thesis on RNA virus-based cancer vaccines.
PACT CSO2× Nature25+ Yrs Cancer VaccinesIND Experience

Why we are
building this.

A founder's letter from Marc van der Chijs, Co-founder & Chief Operating Officer.

I've been thinking about longevity since at least 2017. Back then I wrote about it as an investor thesis, the idea that extending human healthspan would become one of the defining technological challenges of our generation. It was somewhat abstract at the time.

Then I lost two friends to cancer. That changed a lot for me, because something abstract suddenly became personal very fast.

When someone close to you dies from cancer, at some point, if you're the kind of person who builds things, you stop asking "why did this happen" and start asking "what is actually being done" and "where are the gaps." I started reading papers about cancer immunotherapy, personalized medicine, and neoantigen vaccines. And I found a gap that shouldn't be there.

The work

Personalized cancer vaccines have been in human trials for almost two decades. The clinical signal is real. Patients respond. The bottleneck is not the modality. The bottleneck is the design layer, and the field has been working around it rather than through it.

Sean Clark and I co-founded Helixion Therapeutics in Vancouver to attack that problem head-on. Sean has been my business partner for almost a decade. He's the co-founder of Nasdaq-listed Hut 8 and a TSX-listed ETF. He is a builder. Not a career academic, but someone with deep technical ability who can take a complex problem and ship a working solution. We complement each other well.

The defining moment came when Dr. Stefanie Mandl-Cashman joined us as CSO. Stefanie has spent more than 25 years in cancer immunotherapy and led research at three biotechs that took personalized therapies into patients. With her on the team, the scope of what we are building expanded. The personalized cancer vaccine field has been targeting a narrow slice of what the tumor actually presents to the immune system. Helixion is going after the rest of it. That is the design ceiling we are working to break.

The vision

A personalized cancer vaccine designed from the broadest target universe available, manufactured to the highest provenance standard, delivered at software speed. Every step cryptographically attested. The window is open. We are moving.

If any of this resonates, get in touch.

"Your immune system is designed to find and kill cancer cells. The question is: which mutations do you pick? I realised this is a computational problem — and that the current tools are not solving it well."

"The clinical signal for personalized cancer vaccines is real. Patients respond. The bottleneck is not the modality. It's the design layer."

"Mutation-derived neoantigens are about 2% of what the tumor actually presents. The other 98% is what we are building Elyra to reach."

Work with us

We are looking for computational biologists, immunologists, and bioinformatics engineers who want to work on a problem that matters.

See Open Roles

Build the AI that
defeats cancer.

We are assembling the team to take it into patients. If you have spent your career on neoantigen biology, HLA prediction, or clinical genomics pipelines, this is where that work matters most.

Mission
Patients with cancer are running out of time. So are we.
Day 1
Real science. No PowerPoint-stage startup.
Small team
Your name on the science, not buried in a department
Equity
Meaningful founder-level equity for early team members
Full-Time or Contract · Remote
Computational Immunologist

Push the scientific frontier of how the platform identifies and ranks tumor antigens. You will work directly on the models that decide what becomes a vaccine.

PhD or MSc in computational biology, bioinformatics, or immunoinformatics
Deep familiarity with neoantigen biology and HLA presentation
Strong Python and ML fluency
Experience taking research models to clinical-grade software a strong plus
Express Interest
Full-Time or Contract · Remote
Bioinformatics Engineer

Harden the production platform. You will take a validated pipeline from prototype to enterprise-grade, with the rigor and reliability that clinical genomics demands.

Strong Python and bash
Workflow orchestration experience
Linux and cloud compute fluency
Genomics or clinical-pipeline background preferred
Express Interest

We move fast, and we don't waste time. If none of these roles fit but you work in this space, reach out anyway.

sean@helixiontx.com

We are building the
intelligence layer
for cancer therapy.

Talk to us.
Investors · Partners · Scientific collaborators

Helixion is operating with discipline and moving with purpose. We work with partners who understand cancer drug development, value scientific rigor, and want to back a platform built for the long arc.

Investors
Healthcare-focused funds, family offices, and strategic investors at the intersection of AI, oncology, and personalized medicine.
Scientific collaborators
Researchers, clinicians, and institutions whose work overlaps with neoantigen biology and cancer immunotherapy.
Clinical partners
Clinical centers, KOLs, and translational programs interested in advancing personalized mRNA cancer vaccines.
Press & media
Journalists and analysts covering precision oncology, mRNA therapeutics, and AI in drug discovery.

Get in touch

Send us a note and we will respond directly.

Founder & CEO
Sean Clark
Location
Vancouver, BC · Canada