Scientific Breakthroughs of the Week — October 24, 2026

🧬 Life Sciences & Medicine

• Personalised mRNA vaccine lowers melanoma recurrence in a phase 3 trial – Adding the individualised mRNA vaccine intismeran to the immunotherapy drug pembrolizumab cut the risk of recurrence or death by 42% after surgery for melanoma (hazard ratio 0.58, 95% confidence interval 0.45 to 0.75). Each vaccine is built from mutations in the patient’s own tumour, and 1,137 people with resected stage IIB to IV melanoma at 157 centres were randomised two to one to the combination or pembrolizumab alone. Merck and Moderna released the INTerpath-001 results on October 22, before their presentation at the ESMO congress in Madrid, with Georgina Long of Melanoma Institute Australia as principal investigator. The figures come from the companies’ release while the paper awaits publication in NEJM; the benefit was absent in the first six months (hazard ratio 0.99), median follow-up is 24.6 months and overall survival data are not yet mature.
• Triple-hormone drug retatrutide eases obstructive sleep apnoea in two trials – Weekly retatrutide, an experimental drug acting on three gut-hormone receptors, reduced breathing interruptions during sleep more than placebo in adults with excess weight and moderate-to-severe obstructive sleep apnoea. In two phase 3 trials, of 243 people without diabetes and 448 with type 2 diabetes, the 9 mg dose lowered the apnoea-hypopnoea index by 34.3 and 24.7 events per hour after 80 weeks, against about 10 on placebo, from baselines of 58.6 and 55.9. The results were published online in NEJM this week by a team led from the Woolcock Institute of Medical Research in Sydney, with co-authors at the Mayo Clinic, Harvard Medical School and Eli Lilly. Lilly, which makes the drug, funded both trials, gastrointestinal effects were the most common adverse events, and retatrutide remains investigational.
• Ancient proteins tie Xujiayao fossils to the Denisovans – Fossils from Xujiayao in northern China, dated to roughly 199,000 to 138,000 years ago, belong to the Denisovan lineage, and a shared set of skull traits suggests that other East Asian fossils do too. The team recovered 18 proteins from two specimens, found a collagen mutation specific to Denisovans, then compared skull anatomy with fossils such as Harbin, Dali and Jinniushan. The study was published in Nature on October 21 by Song Xing, Qiaomei Fu and colleagues at the Institute of Vertebrate Paleontology and Paleoanthropology in Beijing. The protein evidence comes from only two specimens, and placing Dali, Jinniushan and Hualongdong in the lineage rests on shared anatomy rather than molecular data.

🔭 Physics, Space & Astronomy

• Physicists hold a single positron in its lowest quantum state – A team trapped one positron, the antimatter counterpart of the electron, and held it in its lowest-energy cyclotron state, a set-up the authors call a one-positron quantum cyclotron. Positrons from the radioactive decay of sodium were slowed and captured in a Penning trap cooled to 300 millikelvin, where the particle’s orbit in the magnetic field is quantised. The work was published in Physical Review Letters on October 21 by Gerald Gabrielse and colleagues at Northwestern University. No new measurement is reported yet: the goal is to measure the positron’s magnetic moment to about one part in 10¹³ and compare it with the electron’s, a precision the team projects but has not reached.
• COHERENT tightens its measurement of neutrinos scattering off germanium nuclei – The COHERENT collaboration measured coherent elastic neutrino-nucleus scattering on germanium, a process in which a neutrino nudges a whole atomic nucleus, in what it calls the most precise result to date. Its Ge-Mini detector array at the Spallation Neutron Source of Oak Ridge National Laboratory recorded 124 events from 4.69 × 10²² protons on target, giving a cross section 0.98 times the standard-model expectation. It was published in Physical Review Letters on October 20 by the 107-member collaboration, after an arXiv preprint in March. Statistical and systematic uncertainties are 0.10 each, so the measurement agrees with the standard model and narrows limits on non-standard neutrino interactions.

🌍 Earth, Climate & Environment

• Fifteen years of air sampling show the Amazon releasing net carbon – Atmospheric carbon dioxide measurements over Amazonia from 2010 to 2024 show it emitting a net 0.32 billion tonnes of carbon a year, with fires the largest source at 0.40 billion tonnes. Grouping years by driver, the team found 0.11 billion tonnes in wet years with little deforestation, 0.43 in the high-deforestation years 2019 to 2022 and 0.49 in hot, dry years such as 2015, 2016, 2023 and 2024. The study was published in Nature on October 21 by Luciana Gatti of Brazil’s National Institute for Space Research (INPE) and 32 co-authors, including researchers at NOAA. The group estimates carry uncertainties of up to 0.13 billion tonnes a year, and the split between human and climate drivers comes from classifying years, not from a controlled comparison.
• Last remnant of the Laurentide ice sheet regrew before warming reversed it – Barnes Ice Cap on Baffin Island, the last remnant of the ice sheet that once covered much of North America, reached its smallest size after about 3,600 years ago and began growing again about 2,000 years ago, which the authors read as the start of the next glaciation. The ice cap reached its largest recent extent around 1960 and has since lost mass and retreated, which the team attributes to human-caused summer warming. The study was published in Science on October 22 by Nicolás Young, Joerg Schaefer and colleagues at Columbia University’s Lamont-Doherty Earth Observatory. The record comes from one ice cap, and calling its 2,000-year advance a glaciation is the authors’ interpretation.

⚗️ Chemistry, Materials & Engineering

• Enzymes embedded in compostable plastics speed their breakdown in the deep sea – Compostable polyesters with enzymes embedded in them degraded much faster in seawater than the same plastics without, reaching near-complete degradation within five months at a depth of 757 metres. The researchers mixed ester-cleaving enzymes into four commercial polyesters (PBS, PBSA, PCL and PBAT) during heat processing and placed films at sites from 2 metres to 5,503 metres deep. The study was published in Nature on October 21 by QiuYuan Huang, Tadahisa Iwata and colleagues at the University of Tokyo and the Japan Agency for Marine-Earth Science and Technology (JAMSTEC). The method covers four polyesters already sold as compostable, not conventional plastics such as polyethylene, and degradation on the 5,503-metre seafloor was only moderate.
• Flexible perovskite solar modules reach 20.2% certified efficiency over 750 cm² – Researchers built flexible perovskite solar modules with a certified efficiency of 20.2% over 750 square centimetres. They changed how a one-molecule-thick anchoring layer and the perovskite are co-deposited so that the two interact less, which let the layer bind to the flexible substrate faster and improved crystal growth. The study was published in Science on October 22 by Yeyong Wu, Yongfang Li and colleagues at Soochow University. Stability was tested on a smaller 14.55 square-centimetre device at 22.0% efficiency, which lost 8% of it after 1,044 hours at 85 °C and 65% humidity, so the durability of the large module is not shown.

📌 Also Notable

• France reports the first known human Shamonda virus infection – A man in his sixties with leukaemia in the Rhône-Alpes area, where the midge-borne virus has been found in cattle, died on October 9 after neurological symptoms, according to a case report in Eurosurveillance described by Nature News, with ECDC monitoring the case.
• UN report projects 2.6 °C of warming even with pledges met – UNEP’s Emissions Gap Report 2026, released on October 21, puts 2025 greenhouse-gas emissions at 58.4 gigatonnes of CO₂ equivalent, roughly flat on 2024, and projects about 2.6 °C of warming by 2100 if national pledges are fully implemented.
• Salt marsh plants damp storm waves only on calmer coasts – Testing intact salt marsh in one of the world’s largest wave flumes, a Dutch team reported in Nature on October 21 that the marsh soil barely eroded under waves up to 2 metres, but vegetation cut wave energy by more than 10% only where waves stayed below about 1 metre.
• Sea level rise could reach the habitat of 15,324 vertebrate species – Modelling 34,120 land vertebrate species, a Sun Yat-sen University team projected in Science on October 22 that up to 15,324 will have habitat exposed to sea level rise by 2100, and that more than 96% of their unflooded refuges lie outside protected areas.

Science review generated on October 24, 2026.