AI-designed drug rentosertib shows reduced “biological age” signals in early trial

An AI-Designed Drug Just Moved Six Different Aging Clocks At Once An experimental drug designed using AI has produced measurable shifts toward a younger biological-age profile in patients. Developed by Insilico Medicine, the drug - rentosertib - was initially engineered to treat idiopathic pulmonary fibrosis (IPF), a progressive, age-associated lung-scarring disease. When researchers analyzed blood samples from a Phase IIa clinical trial, they applied six proteomic profiling "aging clocks" among 42 participants. All six detected reductions in predicted biological age, whereas the placebo group showed little change or slight increases. The most pronounced and consistent effects emerged around week four of treatment. The study was authored by Insilico with academic collaborators from Harvard, Stanford, the Broad Institute, RWTH Aachen, Peking University and Westlake University. Insilico used AI not only to identify a specific enzyme (TNIK) linked to both fibrosis and aging pathways, but also to generate and optimize the specific molecule designed to inhibit it. That dual application makes rentosertib a rare clinical test of AI uncovering a target case and building new therapeutics from scratch. In the earlier Phase IIa, patients in the 60mg once-daily arm recorded a mean improvement in forced vital capacity of 98.4 milliliters against a mean decline of 20.3 milliliters on placebo. FVC declines with age in healthy people over 65 at roughly 20 to 50 milliliters a year, which is why Insilico treats it as a physiological aging marker as well as an efficacy endpoint. Via nature.com. Click to expand "If you manage to add 3 years to everyone's life, the drug should be able to significantly extend the healthy portion of life as well, translating into trillions of dollars in productivity and savings," said Alex Zhavoronkov, Insilico's founder and co-CEO. And according to 2013 chemistry Nobel laureate Michael Levitt, "What convinces me is not the size of the effect but the agreement, because these models share neither their features nor their training data," he said of the six clocks reaching the same conclusion on the same 42 patients. Rentosertib is no longer confined to early-stage laboratory work. In July, Insilico announced that the drug had entered a randomized Phase III trial, expected to enroll 320 IPF patients for a 52-week, once-daily regimen. That trial is designed to evaluate pulmonary-fibrosis efficacy and safety, not life extension - but it advances an AI-generated molecule into the final phase of clinical development. Of note - the study does not prove that rentosertib extends human lifespan or literally shaves years off a patient's age. But the clock results, the senescence and metabolic pathway shifts, and the dose-dependent FVC gains all point the same way, and more study is needed to understand the possibilities. If the drug succeeds clinically, it validates AI-driven drug discovery, and offers a template for testing future medicines against both specific age-related diseases and the biomarkers of aging itself. If it fails in Phase III, the aging clocks will have been measuring a lung. Tyler Durden Wed, 09/09/2026 - 22:10

Artificial intelligence has long been imagined as the future of medicine. The idea that AI will someday cure cancer is widespread enough that Anthropic CEO Dario Amodei recently posted that “saying that AI will cure cancer is more a cliché than it is inspiring,” while OpenAI CEO Sam Altman claimed that curing cancer wouldn’t be “enough” and that “we should set our sights higher.” Despite the hype, an AI-based miracle cure has yet to arise. But a different medical breakthrough may be on the horizon, courtesy of an AI-designed drug that early trials suggest could reverse the effects of aging. Turning back the clock The drug, called rentosertib, was created by Insilico Medicine, an AI-based company that designs and develops drugs. It developed the molecular structure for Rentosertib, for example, with assistance from AI. Last year, researchers tested rentosertib in a clinical trial using so-called “aging clocks” to measure the drug’s effect on participants’ aging, and the results were published this week in Nature Biotechnology. Aging clocks use AI technology to estimate how quickly a person’s body is aging (and how close they are to dying), using various biological, physiological, and psychological markers. The researchers used six different aging clocks to generate predicted ages for participants at the start and end of a 12-week trial period. Though each aging clock completes a different analysis of a person’s biological markers, all six clocks predicted reduced ages for all 42 participants at the end of the trial, relative to their predicted ages before taking the drug. Those who received a placebo or no treatment, meanwhile, saw their predicted ages increase or stay the same. Too good to be true? Though biohacking is all the rage these days, the scientific community is split on the accuracy and usefulness of aging clocks. With no universally agreed-upon way to measure a person’s biological age, the study’s results should be taken with a grain of salt. Rentosertib has also only been tested on a very small and specific sample of people. Insilico’s clinical trial was also testing the drug’s potential for treating a lung disease called idiopathic pulmonary fibrosis, which all of the participants had, meaning the drug has yet to be tested on healthy patients. Regardless of the drug’s efficacy, it’s still years away from regulatory approval. But if rentosertib really does reduce aging, we’ve got nothing but time on our hands.