system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
In which of the following malignacies histological Grade is a good prognostic indicator?
assistant
The correct answer is  Heterogenous group of rare malignant tumours. Combining histological parameters-no of mitosis per eyefield, presence of necrosisi. Cellular and nuclear morphology. Tumour differentiation and neurotic index. Assess the risk of metastasis.