Scientific Breakthroughs of the Week — September 5, 2026

🧬 Life Sciences & Medicine

• Pan-RAS inhibitor shrank tumours in a third of treated lung cancers – Daraxonrasib, an oral drug that binds RAS proteins while they are switched on, shrank tumours in 31 to 37 percent of 136 previously treated patients with metastatic RAS-mutant lung cancer. Among the 38 given 160 to 220 mg, 42 percent responded, with median progression-free survival of 8.3 months and median overall survival of 16.0 months. The phase 1/2 trial appeared in the New England Journal of Medicine on September 1, led by Kathryn Arbour at Memorial Sloan Kettering. It had no control group, side effects of grade 3 or worse affected 54 percent of participants and four deaths were attributed to treatment, so the randomised phase 3 RASolve 301 trial remains the test.
• A phase 3 immunotherapy trial in breast cancer missed its endpoint – Adding atezolizumab to neoadjuvant chemotherapy did not significantly improve event-free survival in stage II or III triple-negative breast cancer, the primary endpoint of the NSABP B-59/GeparDouze trial. Across 773 patients on the drug and 777 on placebo the hazard ratio was 0.80 at a p value of 0.083, a 3.3 point difference at four years, while immune-related adverse events rose from 11.4 to 27.6 percent. The double-blind trial was published in Nature Medicine on September 1 by Sibylle Loibl of the German Breast Group with NSABP collaborators. Subgroup and gene-expression analyses hinting at benefit in node-positive tumours were exploratory, and cannot show which patients, if any, should receive the drug.
• RNA polymerase read a synthetic eight-letter DNA alphabet – Cryo-electron microscopy captured E. coli RNA polymerase transcribing hachimoji DNA, which adds two laboratory-made base pairs to the four letters life uses. The structures show the enzyme’s trigger loop closing on the synthetic pairs, which is why transcription proceeds accurately instead of stalling. The work was published in Nature Communications on September 2 by Dong Wang’s laboratory at the UC San Diego Skaggs School of Pharmacy, with Steven Benner, whose group created hachimoji DNA. The experiments used purified enzymes in a test tube, and no living cell has yet been shown to maintain or replicate an eight-letter genome.

🔭 Physics, Space & Astronomy

• Xenon detector logs one event it cannot pin on background – The LUX-ZEPLIN experiment reported a single particle recoil that survived every background check, in an energy region where a heavy dark matter particle could sit. It comes from 220 live days of data taken between March 2023 and April 2024 in ten tonnes of liquid xenon underground in South Dakota, and were it a WIMP the particle would exceed 200 GeV. The collaboration presented the analysis on September 1 at the TeV Particle Astrophysics conference in Japan, and posted a preprint submitted to Physical Review Letters, not yet peer reviewed. Its significance is 2.6 sigma against the 5 sigma particle physics requires, and Rick Gaitskell of Brown University said the team is not claiming to have seen dark matter.
• Roman Space Telescope left Earth for its post at L2 – NASA’s Nancy Grace Roman Space Telescope launched on August 30 at 11:26 UTC on a SpaceX Falcon Heavy from Kennedy Space Center, separating from the upper stage 31 minutes later. It is on a three-month cruise to the second Sun-Earth Lagrange point, 1.5 million kilometres out, where it is to survey dark energy, count planets by microlensing and image a field at least 100 times wider than Hubble’s. NASA’s mission blog confirmed launch and separation, and commissioning has begun. No science has been demonstrated yet: in-flight instrument performance, optical alignment and survey cadence remain to be verified.
• Seven optical clocks in four countries agreed to extreme precision – Metrology institutes in Italy, France, the United Kingdom and Germany compared seven optical clocks over two months, linked by the European research fibre network rather than satellite. The campaign produced frequency ratios with uncertainties between 7.7 and 61 parts in a billion billion, and two independently built ytterbium ion clocks at NPL and PTB agreed to within 7.7 parts in a billion billion. The results were published in Nature on September 4 by the four institutes and partners. It is a step toward redefining the second on an optical transition, but it does not settle which transition to choose, and the fibre links remain confined to western Europe.

🌍 Earth, Climate & Environment

• Peatland carbon release depends on water table and heat together – Raising water tables cuts carbon dioxide emissions from peatlands, but the size of the cut depends on temperature, across 276 site-years of annual flux measurements from temperate and boreal peatlands. Emissions begin to fall once water tables rise above the 60 to 75 centimetre depth band, and the largest reductions need levels within about 20 centimetres of the surface. The analysis, which used explainable machine learning, was published in Nature Communications on September 4 by Nicolas Behrens and colleagues at the University of Münster. It is observational, so those thresholds are statistical associations across unevenly distributed sites, not the result of controlled manipulation.
• A 76 square kilometre ice island survived hitting Joe Island – The berg that broke from Greenland’s Petermann Glacier on August 4, its largest loss of floating ice since 2012, struck Joe Island in Nares Strait on August 23 and 24 without breaking apart. Landsat 9 imaged the encounter and Sentinel-1 had caught the calving; earlier bergs, including one in 2010, split in two at that same island. NASA’s Earth Observatory published the sequence this week, with comment from Adam Garbo of the University of Ottawa and Mauri Pelto of Nichols College. Surviving the collision says nothing on its own about the glacier’s health, and two rifts of 94 and 84 square kilometres remain on Petermann.

⚗️ Chemistry, Materials & Engineering

• Computed five-metal borides turn CO2 to CO without added voltage – A computational screen of high-entropy MBenes, layered borides containing five different metals, identified compositions predicted to reduce carbon dioxide to carbon monoxide without an applied electrical bias. The screen tested 56 candidate compositions against adsorption strength and selectivity criteria, and three passed all of them. It was published in npj Computational Materials on September 2 by a group at the Indian Institute of Technology Gandhinagar. All of it is density functional theory: none of the three compositions has been synthesised or tested electrochemically, and the authors call experimental work the necessary next step.
• How catalyst powder is wetted decides fuel cell ink quality – Briefly pre-mixing platinum-on-carbon catalyst with water before the ionomer binder goes in sets how well the resulting fuel cell ink disperses, and with it how much catalyst surface stays electrochemically available. A short pre-mix followed by one hour of main mixing gave the highest electrochemical surface area in the study, 64.42 square metres per gram of platinum. The work comes from Kanazawa University, the University of Tokyo and HORIBA, in the Chemical Engineering Journal, reported on September 4. It covers one catalyst and ionomer system at laboratory scale with no full-cell durability data, so whether the effect survives manufacturing is untested.

📌 Also Notable

• A 2002 procrastination study was retracted – Psychological Science retracted “Deadlines and Procrastination” by Dan Ariely and Klaus Wertenbroch on September 2, after a July 15 replication in the same journal and analyses on the Data Colada blog questioned the original data; Ariely said the data cannot be trusted.
• The Ig Nobel prizes left the United States – The 36th ceremony was held in Zurich on September 3, the first outside the United States in 35 years, with winners including a soil-health study that buried 1,000 pairs of underpants.
• Extreme drought reached 44 percent of Puerto Rico – A wet season that normally starts in May largely failed, leaving 44 percent of the territory in extreme drought by August 25, under a state of emergency declared in late July and a federal drought disaster declaration in late August, according to NASA’s Earth Observatory and the US Drought Monitor.
• In-body CAR T cells depleted B cells in 16 patients – A lentiviral vector delivered CD19 CAR genes directly into 16 people with refractory neurologic autoimmune disease, seven with progressive multiple sclerosis, all of whom showed B-cell depletion and improvement after one dose, in an uncontrolled New England Journal of Medicine case series published September 1.

Science review generated on September 5, 2026.