Research

Study: Antarctic Sea Squirts May Support Melanoma Treatment

Is this a medical breakthrough or a premature distraction from patients running out of options?

Published JUN 30

Study: Antarctic Sea Squirts May Support Melanoma Treatment

Story

Above: The Antarctic Sea on March 5, 2025. Image credit: Sebnem Coskun/Anadolu/Getty Images

The Facts

Researchers from the University of South Florida (USF) recently completed a six-week expedition to Antarctica, collecting samples of ascidians — marine invertebrates known as sea squirts — that harbor a bacterium capable of producing a compound that kills melanoma cells without harming healthy human cells.
The Indian Express
BBC Science Focus Magazine
The compound, palmerolide A, was traced to a previously unstudied bacterium called Candidatus Synoicihabitans palmerolidicus, which lives within the ascidian species Synoicum adareanum, found in the waters around Antarctica's Anvers Island archipelago.
Discover Magazine
Desert Research Institute
Melanoma is estimated to cause around 57,000 deaths globally each year, a figure researchers warn could climb to approximately 96,000 by 2040. The disease is most prevalent among fair-skinned populations in Australia, New Zealand and parts of Western Europe.
The Indian Express
BBC Science Focus Magazine
USF chemistry professor Bill Baker said toxins from the ascidians have already killed melanoma cells in mice without killing the mice themselves. Baker noted that grams of material would be needed for expanded animal studies before any human trials could begin.
University of South Florida
guardian
Divers descended to depths of up to 130 feet (39.6 meters) in dives lasting 25 to 35 minutes, facing hazards including ice, leopard seals, shifting seas and limited visibility. Two remotely operated vehicles were also used to locate and map ascidian distribution along the Antarctic Peninsula.
University of South Florida
guardian
Baker noted that producing sufficient quantities of palmerolide A for drug development is a key challenge, as a basketball-sized collection of ascidians yields only a fraction of the material needed. Researchers say synthetically reproducing the compound in a laboratory setting is a necessary next step.
Desert Research Institute
guardian

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The Spin

Narrative A

Organisms containing bacteria that literally kill melanoma cells while leaving healthy cells completely unharmed are exactly the kind of selectivity that makes a viable drug. More than half of FDA-approved drugs come from natural sources, and this discovery fits squarely in that tradition. The ocean floor is an untapped pharmaceutical goldmine, and the region near Antarctica is proving that.

BBC Science Focus Magazine

University of South Florida

Narrative B

Melanoma is a shape-shifting disease that outsmarts even the most advanced treatments. A promising compound is still years away from clinical use, and the pipeline for patients whose cancer stops responding to existing drugs is already dangerously thin. Getting excited about early-stage marine biology while refractory patients run out of options is a luxury the field cannot afford.

Aptitude Health