There was no significant difference in IL-7 concentration in the primary tumor between M1 and M0 cancers (respectively, 51.3 pg/g (23.2–79.3) and 66.1 pg/g (54.7–77.5); p = 0.440), or in tumor-adjacent macroscopically normal tissue (15.5 pg/g (5.5–43.8) and 23.5 pg/g (16.6–33.3); p = 0.481). Here, IL7 is linked to cancer.