Median follow-up times after GIST diagnosis for patients of different TNS2 expression levels whose tumors did not develop metastases were 6.6 years for weak (n = 36, range 0.1–15.3 years), 6.3 years for intermediate (n = 37, range 0.1–17.3 years), and 8.6 years for strong (n = 58, range 0.1–19.6 years). This evidence concerns the gene TNS2 and gastrointestinal stromal tumor.