theSIGNAL SCIENCE
17 October 2026
"The important thing is not to stop questioning. Curiosity has its own reason for existing."
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Science

Immune Cells That Refuse to Run Out

USC scientists have found that immature immune cells can multiply in the lab and be engineered to hunt tumors, challenging a textbook rule.

What if the best cancer drug were a factory, not a pill? That is the odd, hopeful idea behind a study just published in Cell by a team at the University of Southern California. Cancer immunotherapy has a stubborn problem. Engineered immune cells can be astonishingly powerful, yet they are hard to make in large numbers, and they often fade once they are inside the body.

Each batch is costly. Each patient needs their own. So the USC researchers asked a different question: could they start earlier in the cells' life story? They chose granulocyte-monocyte progenitors, or GMPs.

These are immature cells that normally grow up into macrophages and other defenders against infection. And here is the surprise. In the laboratory, GMPs could be grown extensively while keeping their ability to become working immune cells. The team then edited them genetically, so that they recognized specific cancer markers and boosted wider immune responses.

Photo: Louis Reed / Unsplash
Researchers culture immature immune cells in a laboratory, hoping to build a renewable supply for cancer therapy.
Discuss
  • Why might growing immune cells in large numbers be harder than engineering them to recognize tumors?
  • The cells worked in mice, but what additional evidence would convince you they could help human patients?
  • How does discovering that progenitor cells can self-renew change the way scientists should teach cell biology?
Science

Antarctica's Ice Peaked, But Barely

On September 14, Antarctica's sea ice hit its winter peak: 17.59 million square kilometers. Impressive? Not really. It was the third-lowest maximum since satellites began watching. Odd, because the ice grew to record highs from 2012 to 2014, while the Arctic, ringed by North America and Eurasia, melted. Then 2015 ended the streak.…
  • If Antarctica's record growth was natural variation, what else might we be misreading?
∞
The study establishes a scalable and engineerable GMP platform for cellular immunotherapy and introduces concepts that we believe could have broad implications for both cancer immunotherapy and stem cell biology.
Qi-Long Ying, MD, PhD, professor of stem cell biology and regenerative medicine, Keck School of Medicine of USC
Science

Hitler's Reactor Was Never Close

Cubes of uranium, each small enough to hold, have just undone a wartime legend. Werner Heisenberg's B8 reactor, built in 1945, was supposedly nearly ready. Was it? Researchers examined surviving cubes and old records, and the answer looks like no. The reactor would have needed far more uranium and heavy water than Germany possessed. Heavy water slows neutrons, keeping a chain reaction alive. Germany simply never had enough.…
  • Why do wartime myths about scientific near-misses survive for decades after the evidence disproves them?
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theSIGNAL IN THE LAB
1VOCABULARY
stubbornprogenitors
self-renewalresistedstreak
survivingchain reaction
2GRAMMAR FOCUS
Participle clauses — present (-ing) and past (-ed)
A participle clause shortens a longer sentence and shares its subject with the main clause. Use a present participle (-ing) for active meaning and a past participle (-ed) for passive meaning, e.g. 'Engineered by scientists, the cells survived' or 'Settling in the bone marrow, the cells kept working.'
engineered · settling · examined · ringed · slowing · built · hitting
  1. to recognize specific cancer markers, the immune cells attacked tumors more precisely.
  2. The engineered cells stayed in the bone marrow, out fresh immune cells for a long time.
  3. the progress of both blood cancers and solid tumors, the treatment gave researchers real cause for hope.
  4. The Arctic, by North America and Eurasia, continued to lose ice during those years.
  5. Antarctica's sea ice reached its winter peak on September 14, the third-lowest maximum since satellites began watching.
  6. Heisenberg's B8 reactor, in 1945, was supposedly close to working.
3PHRASAL VERBS
Match the phrasal verb to its definition. All six appear in today’s articles.
  1. fade (the cells often fade once they are inside the body)
  2. start (could they start earlier in the cells' life story?)
  3. grow up (immature cells that normally grow up into macrophages)
  4. settle in (the engineered cells settled in the bone marrow)
  5. run out (Immune Cells That Refuse to Run Out)
4CRITICAL THINKING
The Antarctic ice story and the reactor story both involve a dramatic narrative being replaced by a more modest one. Which of the two corrections do you think the public is more likely to accept, and why? Consider who benefits when a surprising story stays popular and what makes a newspaper correction less memorable than the original claim.
5CREATIVE · HEADLINES
Write a headline for the top story in each of the following styles. One line each, no explanation:
  • TABLOID NEWSPAPER
  • LUXURY MAGAZINE
  • ACTIVIST BLOG
6WRITING
Imagine you are a science editor who has to cut the immune-cell story to a 100-word summary for readers with no biology background. Write that summary, choosing one comparison or image (like the factory idea) that makes the discovery easy to grasp.
7DEGREES OF EXTREMITY
Complete each ladder from mild to strong.
  • The results were quite encouraging.→→
  • Cancer immunotherapy is somewhat difficult to scale up.→→
  • The Antarctic ice maximum was a bit low.→→
  • The idea seemed slightly strange.→→
  • The old theory was somewhat shaky.→→
  • The wartime legend lasted quite a long time.→→
8SPEAKING
  1. Which would worry you more: a failed treatment or a misleading headline?
  2. When has a surprising fact made you doubt something you learned at school?
  3. How much should researchers share unfinished findings with the public, and why?
  4. Would you rather read science news as short alerts or long explanations?