What are advantages of new systems?

• Easier for patient, G1 is lowest grade • Better reflects biology • GG1 excellent prognosis, no metastasis, avoids GGS<6 • GG2 rare metastasis • GG3<GG2, better distinction between 2 SG7 groups • GG4 better prognosis GG5 • GG5, no need to distinguish 9 and 10