Treatment to paraganglioma

Hi, My father is 70 yrs old. He has bee diagnosed with multiple reccurent paraganglioma tumours in the intestine region. The first sugestion had been t get the tumours operated, which we followed. The Laproscopy before the operation showed 4 tumours, with one to be in the lower intestine region (lets call it t4). The t4 was also see to have the aorta (vein) passing through it. The surgeon had taken the help of a vasculor sergoun to get past the risk of bypassing the vein. The operation was done nearly 1 wk after this. During the operation, the Surgeons saw t4 to have spread rapidly and has spread through the small intestine region in such a way that it was impossible to get to the intestine. The other 3 tumours were removed. t4 is still left behind to grow and engulf the intestine. The doctor saw there are no more options and said there is no Chemotherapy availible for the same. I would like to understand if there is anything we could do through Homeopathy.