Basophils inhibit early lung metastasis by suppressing regulatory T cells.

In mice, basophils suppress early lung metastatic seeding by inhibiting regulatory T cells, and blocking HRH1 with loratadine abolishes this suppression and accelerates metastasis.

• Why it matters: Basophils’ role in cancer is unclear, and early metastatic establishment in the lung is a key bottleneck where immune regulation may be therapeutically targetable.
• What they did: The study tested basophil effects on lung metastasis in mice and used HRH1 blockade with loratadine; it also ran a prospective double-blind crossover trial in 40 healthy volunteers measuring T reg cell frequency.
• The result: Loratadine increased circulating T reg cell frequency in trial participants, and higher blood basophil counts predicted improved survival across human cancers, with integrative multiomic data linking basophil states (B0 vs B1) to outcomes.

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