It has been found that sympathectomy might influence tumorigenesis. The published data suggests that sympathectomy might suppress immune functions.
Sympathectomy might influence thermogenesis by modulating the activity the activity of the immune system in two ways - by reducing the modulatory influences of catecholamines on immune cells as well as by increasing the secretion of glucocorticoids.
Seminars in Cancer Biology 18 (2008)
Bors Mravec, Yori Gidron, Ivan Hulin