The colon cancer that won't go away

Today I saw a man in his 40's in clinic who had colon cancer a few years ago. This was resected and he underwent chemotherapy. Last year he had a CT scan that showed a mass in his liver. It was biopsied and was positive for metastatic colon cancer. He then underwent a liver resection. Unfortunately, he had a CT today which shows multiple discrete lung nodules in both lungs and a possible recurrence of his liver metastasis. We told him that we would discuss his case in tumor board. If it turns out that he has recurrence of his metastatic colon cancer to the liver, then there is no point in resecting the lung nodule.  And to think that he is only in his 40's... I don't know why these things happen.