La relación entre el estrés crónico y el cáncer es mediada por la disminución en la actividad de las células NK, el aumento de cortisol y catecolaminas que además de disminuir la inmunidad celular tienen un efecto directo en la promoción del crecimiento tumoral al estimular la angiogénesis (formación de nuevos vasos sanguíneos) y las metástasis.
El estrés también disminuye la capacidad de autoreparación del ADN en el núcleo celular y estimula la apoptosis (muerte celular programada).
Estudios en pacientes que van a ser operados de tumores cancerosos muestran que el estrés prequirúrgico está relacionado a un aumento de las metástasis postoperatorias, esto se explica porque disminuye la actividad de las células NK encargadas de eliminar las células cancerosas residuales de la cirugía
En la revisión de Antoni (2005) " The influence of bio-behavioural factors on tumour biology: pathways and mechanisms" se muestra como los mediadores nerviosos y hormonales del estrés, las catecolaminas y los glucocorticoides pueden activar vías celulares dentro de los tumores que contribuyen a su crecimiento y progresión, sinergísticamente facilitan el crecimiento tumoral. Situaciones estresantes caracterizadas por incremento de catecolaminas y cortisol pueden tener un gran impacto en los procesos relacionados al cáncer.
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