CaMKK2: A tumor stress-integration node

Tumor progression depends on coordinated adaptation of cancer cells and the tumor microenvironment to immune pressure, metabolic limitations, genomic instability, and biomechanical stress. While these adaptive responses have often been investigated through distinct experimental and conceptual frameworks, increasing evidence indicates that they converge on shared regulatory pathways. Calcium signaling is a fundamental regulator of cellular adaptation; however, its role in integrating tumor stress responses remains unclear. This review synthesizes emerging evidence identifying calcium/calmodulin-dependent protein kinase kinase 2 (CaMKK2) as a key regulator linking calcium signaling to coordinated tumor and microenvironmental adaptation across mechanical, metabolic, replication, and immune stress responses. We discuss how CaMKK2 supports tumor ecosystem fitness through convergent tumor-intrinsic and microenvironmental programs and consider the therapeutic implications of targeting CaMKK2 and its signaling network, emphasizing context dependence, rational combination strategies, and biomarker-guided clinical translation.