Aspirin in Oncology
Deep-dive guide to aspirin in oncology, including mechanisms, cancer-type evidence, dosing, safety, and immune relevance
Aspirin is one of the most credible repurposed drugs in oncology.
It matters because it sits at the overlap of inflammation, platelet biology, immune evasion, and metastatic spread.
The strongest current human signal is in PIK3CA-mutated colorectal cancer. One of the most important broader mechanisms is platelet TXA2 suppression.
At a glance
What it is: A long-established NSAID that irreversibly inhibits platelet COX-1
Why it matters: It can affect inflammation, platelet-assisted metastasis, and tumour-immune biology at the same time
Best-supported use today: Investigational adjuvant use in PIK3CA-mutated colorectal cancer
Most important mechanism page: Aspirin and Thromboxane A2 (TXA2)
Main limitation: Bleeding risk remains real, and benefit is not uniform across cancer types
Start here
What this hub covers
This hub is built to answer four practical questions:
where aspirin has the best evidence
how aspirin may work in cancer biology
which cancer types have the strongest or weakest signals
where safety, bleeding, and treatment-context limits matter most
Best-supported settings today
1. Biomarker-selected colorectal cancer
This is the clearest current human evidence base.
Low-dose aspirin now has serious clinical relevance in PIK3CA-mutated colorectal cancer.
2. Platelet-focused anti-metastatic biology
Aspirin is increasingly relevant as a platelet-directed tool, not just a general anti-inflammatory drug.
That is where TXA2, platelet shielding, and immune-evasion biology become central.
3. Selected prevention and adjunctive settings
Outside colorectal cancer, aspirin still sits mainly in the investigational range.
The logic may still be strong in selected settings, but it is not a general standard of care.
Key cautions
Bleeding risk is the main practical limit
Dose and duration change the interpretation
Tumour type and biomarker status matter
aspirin should be reviewed like a real medication, not a casual add-on
Jump to another Aspirin page
Core pages
Mechanism deep dive
Practical pages
Cancer-type pages
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This information is for education only. It is not medical advice, diagnosis, or treatment. Please speak with a qualified clinician before making changes to care, medication, or supplement use.
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