Episode Summary
Executive Summary: Laura Deming explains Until’s mission: build reversible cryopreservation to pause biological time for organs now, and eventually for whole bodies as a form of medical hibernation. The discussion covers why the field is scientifically plausible, the engineering/biology tradeoffs, why it’s been underfunded, and how successful organ preservation could transform transplant medicine and future critical care.
Main Topics: Until’s mission and product strategy (Priority: 5/5): Until aims to create reversible whole-body cryopreservation long term, but is starting with reversible preservation of single human organs to improve transplant logistics and outcomes. Medical hibernation as critical care (Priority: 5/5): Deming frames cryopreservation as a new kind of critical care: pausing a patient until a life-saving therapy becomes available, rather than only preserving organs for transplant. Scientific basis of cryopreservation (Priority: 5/5): The conversation explains that ice formation is probabilistic, can be minimized by controlling cooling/rewarming rates, and that reversible cryopreservation already works in embryos and some tissues. Engineering versus biology tradeoffs (Priority: 4/5): A major theme is that better engineering can reduce biological difficulty by enabling faster cooling and warming, which lowers the need for toxic cryoprotectants, but biology still sets real limits. Why the field has been neglected (Priority: 4/5): Deming argues cryopreservation and longevity were long underfunded and culturally treated as science fiction or socially awkward areas, despite being technically tractable in parts. Roadmap from organs to whole-body preservation (Priority: 4/5): Until is working in parallel on human organs and reversible whole-animal hibernation, with the brain as the biggest unknown for whole-body application. Patient and transplant-system implications (Priority: 5/5): The near-term upside is giving transplant patients more time, better matching, less rushed surgery scheduling, and a system where time is no longer the limiting variable.
Key Arguments: Reversible cryopreservation is scientifically plausible because ice formation is stochastic, not all-or-nothing, so carefully managing temperature and timing can prevent damaging ice. The biggest near-term value is transplant medicine: if organs can be preserved longer, hospitals can optimize matching and scheduling instead of racing against organ expiration. Whole-body hibernation is a longer-term extension of the same core technology, but the brain remains the hardest unknown and a major scientific risk. Engineering advances can materially reduce biological problems, especially by increasing cooling and rewarming rates and thereby reducing reliance on toxic cryoprotectants. The field was historically underworked not because it was obviously impossible, but because it sat in a social/academic blind spot and lacked resources. Existing proof points make the field credible: human embryos have been reversibly cryopreserved for decades, and kidney preservation experiments have shown functional recovery in animals.
Data Points: Human embryo storage duration: 30+ years - Deming cites embryos that were cryopreserved and later used to create a pregnancy after more than three decades. Metastatic melanoma prognosis: 6 to 9 months - Used as an example of how a disease once considered rapidly fatal can improve with new therapies. Metastatic melanoma survival improvement: Decade-plus survival / ~50% surviving over a decade - Example showing how quickly a critical cure can change outcomes when time is available. Therapy eligibility delay: A couple months - Her co-founder’s father-in-law missed eligibility for a cancer therapy by only a few months. Temperature threshold for ice formation: Around -130°C - Deming describes this as the regime below which ice formation stops happening and long-term preservation becomes feasible. Transplant logistics window: Within a two-hour radius - Patients often must stay near a transplant center because organs become available unpredictably and must be used quickly. Kidney recovery timeframe: About a month - Deming references work showing a cryopreserved kidney can be rewarmed and regain normal function in a rat after transplantation. Company timeline: Near-term preclinical studies and clinic - Until’s first product goal is to move organ preservation technology into preclinical studies and then clinical use as quickly as possible.
Pivotal Quotes: "Making time not a variable changes the whole paradigm." — Surgeon quoted by Laura Deming: Describing how reversible organ preservation could transform transplantation and surgery scheduling. "Our long-term goal is reversible whole body cry preservation for medical hibernation." — Laura Deming: Until’s overarching mission, stated at the start of the discussion. "What if you could take someone who is on their deathbed and find some way to just sort of hibernate them basically until the sort of critical cure for their disease comes online?" — Laura Deming: Explanation of the medical hibernation use case for whole-body cryopreservation.
Implications: If Until succeeds, organ transplants could become far less time-constrained, improving matching and outcomes. Longer term, reversible whole-body preservation could buy time for terminal patients awaiting future cures and reshape critical care, though brain preservation remains the hardest hurdle.