Mellay,
did your doctor send you for any scans MRI/CT after the surgery? My doctor did a biopsy of the margins and it was only a 3 point. But my tumour was not big 3x2.2x1.5cm. He also did not prescribe radiation therapy because my tumour was low/intermediate; margins indicates complete removal and I'm still young (30) so no radiation to prevent onset of sarcoma in 20-30yrs time.