I recently had surgery to remove NET in small intestine

They did a rt hemicolectomy and small bowel resection. They also did a wedge resection of my liver. They removed all of the tumor. Liver pathology came back clear. What concerns me is 7 out of 20 lymph nodes came back positive and they are telling me there is no treatment. They said high reoccurence and to just do scans and lab work every 6 months. Is this true no treatment just wait for reoccurence???
--Well-differentiated neuroendocrine tumor, grade 2.Tumor is 1.8 cm in greatest dimension.
Lymphvascular invasion is identified.
Perineural invasion is identified.
Number of lymph nodes examined: 20.
Number of lymph nodes involved: 7.
Maximum size of metastasis (glass slide measurement): 4 mm