A Stiff Achilles' Heel: How Tumor Mechanics Shape Metastatic Vulnerability.

Environmental rigidity induces cancer-cell stiffening that enables robust colonization of rigid bone, but simultaneously increases susceptibility to cytotoxic lymphocytes in immunocompetent hosts.

• Why it matters: Metastatic cells must adapt to distant tissue mechanics, yet how that mechanical adaptation affects immune surveillance is unclear.
• What they did: Elbanna and colleagues studied how rigidity-driven stiffening is linked to immune vulnerability, implicating SPP1 in the environmentally induced mechanical adaptation.
• The result: Cytotoxic lymphocytes preferentially eliminate stiffened cancer cells, suppressing bone metastasis in immunocompetent hosts and suggesting mechanics can be an actionable determinant of immune susceptibility.

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