Pathology With regard to the malignant behaviour of leiomyosarcoma, the most important criterion is – A Blood vessel penetration by tumor cells B Tumor cells in lymphatic channels C Lymphocyte infiltration D The number of mitoses per high power field 💡 Explanation With regard to the malignant behaviour of leiomyosarcoma, the most important criterion is - ✓ Correct Answer: D. The number of mitoses per high power field