Berlin, Germany
Open to speaking invitations & collaborations

I'm Omar — translating world-class research into clinical solutions for one of the world's most complex problems: cancer.

Interested in having me speak at your event or panel? Get in touch →

VC raised
€14M
In grants
>€2M
Publications
20+
Citations
700+
About

Working at the edge of
AI and oncology.

I got into oncology the way most people get into something that truly matters — not by plan, but by circumstance. Watching people close to me navigate a healthcare system that was, in theory, one of the best in the world, I kept hitting the same wall: diagnoses that came too late, too incomplete, with too much left to chance. If that was the reality in Europe, I couldn't stop thinking about what it looked like for someone facing the same disease in a low-resource setting, with a fraction of the access.

That question became an obsession. Imagine a system with access to all of it — one that learns from decades of patient records to understand which treatments will work, and which definitively will not. The world's oncologist. My entry point into that vision is pathology: tissue slides that are routinely collected in hospitals everywhere, yet rarely fully utilized. They contain biological signals too complex for the naked eye, too expensive to extract with standard assays at scale, but learnable — if you know how to teach a model to look. My research is about showing what's scientifically possible, publication by publication. StratifAI is about turning those possibilities into solutions that work in the clinic, not just in a paper — and making them accessible far beyond the top academic medical centres.

When I'm not building StratifAI, I read philosophy, seek out great coffee, and find quiet corners of the city to think. I'm drawn to people building things that are genuinely difficult and would have huge impact if they succeed. I grew up in the Netherlands with roots in Egypt, built my research career in Germany, and have since expanded to the US — pursuing my passion has made me a world citizen, and it's only the beginning.

Computational Pathology Weakly Supervised Learning Biomarker Discovery Whole-Slide Imaging Multimodal AI Precision Oncology VC-backed Startup
Omar El Nahhas
Building

What I'm working on.

2023 — Present · CEO & Co-founder
StratifAI
A start-up commercialising AI-based biomarker discovery. StratifAI's Polaris™ platform develops novel biomarkers from routine histology, enabling multimodal data integration to guide treatment decisions in oncology. First diagnostic: breast cancer recurrence risk from H&E slides.
€14M
raised
stratifai.com ↗
Research

Computational pathology.

Kather Lab · TU Dresden · EKFZ for Digital Health

Doctoral research on deep learning for gigapixel whole-slide image analysis — weakly supervised regression models, multi-task transformers, and multimodal AI for novel biomarker development. Supervised by Prof. Jakob Nikolas Kather.

Nature Protocols
From whole-slide image to biomarker prediction: end-to-end weakly supervised deep learning in computational pathology
El Nahhas O.S.M. et al. · 2025
Nature Protocols · 2025
A step-by-step protocol for training weakly supervised deep learning models on gigapixel whole-slide images to predict molecular and clinical biomarkers — no pixel-level annotations required. Covers data preprocessing, model training, and validation across cancer types.
Read paper ↗
Nature Communications
Regression-based deep-learning predicts molecular biomarkers from pathology slides
El Nahhas O.S.M. et al. · 2024
Nature Communications · 2024
Shows that framing biomarker prediction as a regression problem — rather than binary classification — significantly improves performance when predicting continuous molecular targets from H&E slides. Validated across multiple biomarkers and cancer types.
Read paper ↗
Nature Communications
Multimodal histopathologic models stratify hormone receptor-positive early breast cancer
Boehm K.M.*, El Nahhas O.S.M.*, Marra A.* · Co-first author · 2025
Nature Communications · 2025
Integrates pathology image features with genomic and clinical data to stratify recurrence risk in early-stage HR+ breast cancer. The multimodal model outperforms current clinical risk tools, pointing toward AI-guided treatment de-escalation decisions.
Read paper ↗
Nature Biomedical Engineering
Benchmarking foundation models as feature extractors for weakly supervised computational pathology
Neidlinger P.*, El Nahhas O.S.M.* et al. · Co-first author · 2025
Nature Biomedical Engineering · 2025
The largest systematic benchmark of pathology foundation models to date — evaluating feature extractors across tasks, cancer types, and cohort sizes. Provides a practical guide for selecting the right model backbone for computational pathology applications.
Read paper ↗
Contact

Let's talk.

Always open to conversations with ambitious people looking to build or invest in healthcare AI, speaking invitations, and press. If you're working on something hard that matters — reach out.

Find me at
AACR Annual Meeting
San Diego, CA
Apr 17–22
ASCO Annual Meeting
Chicago, IL
May 29–Jun 2
ESMO Congress
Madrid, ES
Oct 23–27
ESMO AI & Digital Oncology
Berlin, DE
Nov 16–18
Send a message
Not the place for job applications or StratifAI hiring inquiries — those go through our careers portal. For everything else, I'll get back to you.
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