Peter Attia· MD
In a cancer that has a RAS mutation, you will not find a BRAF mutation and vice versa. They are mutually exclusive.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
In a cancer that has a RAS mutation, you will not find a BRAF mutation and vice versa. They are mutually exclusive.
Every Sunday: the week’s new conflicts and verdict changes — and nothing else.
Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
RAS is sufficient or BRAF is sufficient to get activation of the pathway.
Whole-body MRI screening in healthy adults produces more incidentaloma harm than cancer-mortality benefit.
Starting colonoscopy screening at 45 (vs 50) prevents enough early-onset cancers to justify the population cost.
Multi-cancer liquid-biopsy tests like Galleri detect early cancers at a stage that meaningfully improves survival.