Cancer Relationship Status: It's Complicated

I guess it's time for an update on Andy's cancer treatment. It's 6 months since he was first diagnosed with stage 4, metasticised colorectal cancer.  On diagnosis he was found to have a large tumour in his bowel which has burst out of the wall and three very large tumours on his liver.  He started on a very brutal chemo regimen of 3 different chemo drugs plus a monoclonal antibody and after 8 rounds scans showed the tumours had shrunk back by nearly 50%.