Hello My father, Alzeihmer patient since 3 years, highly diabetic, had a lump on his head removed recently. Measured 4 cm x 4 cm across and 2 cm height. Had necrosis on the tumour with gangrene. On biopsy it has been identified as angio sarcoma. The surgeon who performed the surgery has suggested chemo and radio therapy. Kindly let me know what kind of doctor to consult and whether cancer treatment is suitable at all considering his age and condition.