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William Gibson

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@wgibson

MD, PhD | Gibson Lab @DanaFarber | Broad Institute | Genomics+Chemical Biology
Boston, MA gibsonlab.org Joined March 2009
890 Following 3.8K Followers 1.9K Posts

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William Gibson Verified account @wgibson
As personalized neoantigen mRNA vaccines extend to other tumor types, it's going to be interesting to see where the effect size is biggest.

TMB=0.1 -> No good antigens, vaccine makes no difference.

TMB=30 -> Checkpoint wipes out the tumor anyway, vaccine makes no difference.

Luckily 95% of patients lie between these numbers, but where is the sweet spot? In the coming years, we'll see!
Adam Feuerstein ✡️ Verified account @adamfeuerstein Aug 19
I have to say, when Merck called me last night with the mRNA cancer vaccine news (embargoed, of course), I literally yelped in reaction.

Consider this: Between this spring's Revolution Medicines success with a KRAS-targeted drug and now Merck and Moderna's success with an mRNA neoantigen vaccine, 2026 will go down as one of the most consequential years in cancer treatment, ever.

Incredible.
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William Gibson Verified account @wgibson
The Moderna Phase 3 results just read out for personalized mRNA vaccines, and it was positive! If the Phase 2b result is representative, the mRNA vaccines in that setting cut the risk of recurrence in half.

"A 49% reduction in the risk of recurrence or death (HR=0.51; [95% CI, 0.294-0.887]) and a 59% reduction in the risk of distant metastasis or death (HR=0.411; [95% CI, 0.200-0.843]) compared to KEYTRUDA alone."

merck.com/news/merck-and…
www.merck.com Merck and Moderna Announce Phase 3 INTerpath-001 Trial of Intismeran Autogene Plus KEYTRUDA® Met... First and only combination regimen to demonstrate statistically significant and clinically meaningful improvements in RFS and DMFS compared to KEYTRUDA alone for these patients in the adjuvant...
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William Gibson Verified account @wgibson
Here at #AACR2026 presenting on induced proximity therapeutics beyond degradation. Would love to connect with anyone working on molecular glues, targeted protein modulation, or p53 – always more interesting to talk in person than over email. DM or find me in the halls.
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William Gibson Verified account @wgibson
RevMed just doubled overall survival in pancreatic cancer by using CypA-targeting molecular glues to potently drug oncogenic KRAS-ON, long deemed untouchable.

One funny thing is that probably the most fundamental insight for daraxonrasib sits in a PNAS paper that's been cited merely 84 times. This showed that molecular glues can coax an endogenous protein to wrap itself around utterly featureless surface. The other is a 2017 Cell Reports paper (just 68 citations) on how Sanglifehrin A can be used to repurpose CypA's surface. A lot of the game-changing stuff seems niche and unglamorous at first.

Greg Verdine is having a chembio Annus Mirabilis for his 2025-2026 streak: FOG-001, Daraxonrasib. He provided much of the foundational conceptual work behind taking out both Beta-catenin and KRAS*.

*of course many others contributed immensely, but let's give some credit where credit is due!
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William Gibson Verified account @wgibson
Beautiful illustration of quantifying p53 protein abundance in mutant cell lines, which we aim to exploit using proximity inducing small molecules.
Prof. Nikolai Slavov Verified account @slavov_n Apr 1
A powerful example of protein abundance regulation.

The degradation rate of p53 determines its abundance.

p53 is special, but regulation by protein degradation is not a special case. It's common:

doi.org/10.1101/2025.0…
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