Triple‐Action Semiconducting Ferrocene‐Prodrug Nanotherapeutics for Sequentially Sonodynamic‐Adjuvant Ferroptosis‐Immunotherapy of Deep Tumors

T cell infiltration and suppressing regulatory T cells, contributing to a considerable antitumor efficacy. Via integrating precisely controlled activation, ferroptosis induction and immune modulation, such nanotherapeutics offer a powerful platform for treating aggressive and therapy-resistant tumors.