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Soil amendments that slow cancer growth.

The recognition that the tumor microenvironment contributes to tumor survival, growth, and response to therapy provides the rationale for considering it a therapeutic target. The article by Alspach and colleagues in this issue provides evidence that p38MAPK acts posttranscriptionally to promote the tumor-permissive secretory phenotype of both cancer-associated and senescent fibroblasts, and that p38MAPK inhibitors already in clinical trials have significant therapeutic potential.