The literal physical shape of a cancer cell can actually make the disease more aggressive.
April 15, 2026
Original Paper
Modulation of Oncogenic KRAS Signaling by Branched Actin-driven Cell Membrane Protrusions
bioRxiv · 10.64898/2026.04.09.717047
The Takeaway
For a long time, doctors thought the weird, spiky protrusions on the surface of cancer cells were just a side effect of the disease. But this research proves that those spikes actually act as amplifiers for the 'cancer signal' itself. By physically stretching the cell membrane, these protrusions create a feedback loop that shuts down the body’s natural tumor suppressors. This means the shape of the cell isn't just a symptom; it’s a weapon the cancer uses to grow faster. If we can find a way to 'flatten' these cells or block their spikes, we could potentially stop the cancer from spreading. It's a new way of looking at cancer as a physical problem, not just a chemical one.
From the abstract
For over three decades, we have known that oncogenic RAS alters the actin cytoskeleton organization and cell surface morphology (1,2). RAS activates the GTPase RAC1, which triggers the growth of branched actin networks to promote cell membrane protrusions (3,4). In melanoma, the hyperactive RAC1 mutant, Rac1P29S, was recently shown to drive extended lamellipodia, which then empower cell proliferation through sequestration and localized inhibition of the merlin tumor suppressor (5). This discover