<prompt> Features, which are evaluated for histological grading of breast carcinoma, include all of the following exceptTumour necrosisMitotic countTubule formationNuclear pleomorphism  <response>: Histological grading is based on nuclear pleomorphism; tubule formation, mitotic count Nuclear pleomorphism: Score 1--relatively small uniform nuclei; score 2--intermediate pleomorphic nucleoli; score 3--relatively large prominent nucleoli Mitotic count: Score 1-- 10 mitoses in 10 HPF; score 2- 10-20 mitoses; score 3-- 20 mitoses Tubule formation: Score 1--75 cells in tubule forms; score 2--10-75 cells in tubule forms; score 3-- 10 cells in tubule forms Grade Score Favourable 1 Unourable Up to 3 Grade I 3-5 Grade II 6-7 Grade III 8-9 Ref; page no;534 5th edition of SRB;S manual of Surgery 