Stelios Tzellos
Oncology Forecasting Leader and Pharmaceutical Analytics Specialist
London, United Kingdom
Ph.D., Molecular Biology, Imperial College London | MSc & BSc, Biochemistry, Imperial College London
About
Stelios Tzellos is a pharmaceutical analytics and oncology forecasting leader based in London, United Kingdom. He holds a Ph.D. in Molecular Biology from Imperial College London and has spent more than a decade applying that scientific training to commercial strategy across the pharmaceutical industry.
His professional focus centers on oncology market forecasting, built through roles at GlobalData, IQVIA, and AstraZeneca. He has worked on disease landscape modeling, competitive analysis, and real-world evidence integration, connecting clinical and biological detail to commercial planning for oncology and haematology therapies.
Dr. Tzellos approaches forecasting the way he once approached laboratory research: define the variables, test the assumptions, and adjust as new evidence appears. That discipline, built during his doctoral study of Epstein-Barr virus gene regulation, continues to inform his oncology analytics work at AstraZeneca today.
Education
Imperial College London
Doctoral research on Epstein-Barr virus gene regulation, focused on the EBNA-2 gene and the mechanism behind the superior B-cell immortalization activity of type 1 EBV. Published first-author research in the Journal of General Virology.
Imperial College London
Graduate coursework in biochemistry ahead of doctoral research in molecular biology.
Imperial College London
Undergraduate foundation in biochemistry, building toward his doctoral specialization in molecular biology.
Focus Areas
Oncology Market Forecasting
Builds demand and revenue models for oncology and haematology therapies, from early pipeline stages through post-launch performance.
Real-World Evidence Integration
Incorporates registry, observational, and healthcare utilization data into commercial models to reflect how therapies are used after launch.
Molecular Biology and Translational Science
Applies a research background in gene regulation and virology to ground commercial analysis in the underlying biology of a therapy.
Pharmaceutical Commercial Strategy
Connects scientific and clinical evidence to launch planning, positioning, and long-term portfolio decisions.
Oncology Pipeline and Competitive Analysis
Assesses emerging therapies, treatment sequencing, and competitive entrants across haematology and solid tumor indications.
Biomarker-Driven Market Access
Evaluates how biomarker testing rates and treatment line positioning shape adoption and reimbursement.
Disease Epidemiology and Landscape Modeling
Builds the epidemiological foundation behind credible forecasting, from patient population sizing to treatment pathway mapping.
Forecast Validation and Methodology
Tests model assumptions against observed performance and refines projections as new data becomes available.
Activities
Football and Formula 1
United Kingdom — Ongoing
Stelios follows football and Formula 1 closely, drawn to how both reward preparation, structure, and the ability to read a competitive field over time. The same instinct for spotting patterns and testing assumptions under pressure carries into his forecasting work, where market conditions shift quickly and models have to be adjusted as new information comes in.
Live Music, Theatre, and Home Projects
United Kingdom — Ongoing
Outside of his professional work, Stelios attends concerts and theatre performances and takes on DIY projects around the home. The hands-on, tangible nature of home improvement work offers a direct counterpoint to the data-driven analysis that fills most of his working hours.
Writing
His primary personal website, covering his career across GlobalData, IQVIA, and AstraZeneca and his background in molecular biology and oncology analytics.
Commentary on pharmaceutical forecasting methodology, competitive intelligence in oncology, and the case for scientific training in commercial pharma roles.
Video content on oncology market trends, including treatments for Hodgkin’s lymphoma, multiple myeloma, and leukemia, and broader pharmaceutical forecasting topics.
An audio show covering oncology market development, pharmaceutical forecasting, and commercial strategy in the healthcare industry.
Presentation slide decks on oncology market analysis and forecasting topics.
Contact
For professional inquiries, please reach out directly via LinkedIn or the platforms listed above.