The formalin fixed specimen consists of a piece of rubbery firm yellow brown mass, measuring 2.5 show an ill defined gray white firm mass, measu Representative 3 - D sections are submitted as A B. uring 2.3 em in diameter located closed from the nearest resected margin .MICROSCOPIC FINDINGS e reveal an ill-defined lesion with central necrosis and infiltrated by pleomorphic tumor cells, arranging in a cord-like and solid pattern.Mitosis is frequently seen.The tumor is seen at the resected marign.No distinct LVSI is noted. DIAGNOSIS: Breast, right, excision: - Invasive ductal carcinoma, grade TII- Size 2.0x1.8 cm.- The tumor involves resected margins.NOTE: Immunohistochemistry of ER, PR.HER-2, and Ki-67 will be helptul for biomarker assessment.Slide A ADDENDUM: Immunohistochemistry was performed; ER: Negative PR: Negative HER-2: Negative, score 0 Ki - 67: Labeling 70% ลักษณะเเบบนี้หมายความว่าอย่างไรคะ ?