ANTINEOPLASTIC AGENTS LECTURE 9 PATHOLOGY PHARMACOLOGY

Neoplasia New growth Abnormal mass of tissue the growth of which exceeds and is uncoordinated in comparison to that of the normal tissue and continues even in the absence of the stimulus that initiated the growth of the tissue in this manner. Clinically divided into benign and malignant types

Malignant Neoplasia Innocent Localized Small, demarcated, well differentiated Surgical removal Can progress to malignancy Nomenclature:suffix –oma Examples: Fibroma, lipoma, osteoma, meningioma, papilloma (glands), hepatoma, etc Benign Neoplasia Common terms-cancer or crab- due to their strong adherence properties Can affect neighboring and far away tissues (metastasis) Large, poor demarcation, faster growth, invasive Drug treatment plus surgery No specific nomenclature: Suffix –sarcoma/ carcinoma for mesenchymal tissue like fibrosarcoma, squamous cell carcinoma, adenocarcinoma, HCC, etc Leukemia, lymphoma, etc

Clinical Characteristics- To decide the candidature of cancer chemotherapy 1. Differentiation and Anaplasia - Benign tumors are well differentiated to perform the normal functions of the tissue. Malignancies are anaplastic (anaplasia-dedifferentiated) and pleomorphic. (Not to be confused with dysplasia – abnormal but non-malignant malfunctioning)

2. Rate of growth Low risk: Low grade, well differentiated tumour, Gleason score 2–6 Intermediate risk: Intermediate grade, moderately differentiated, Gleason score 7 High risk: High grade, poorly differentiated, Gleason score 8–

3. Local invasion (staging) 2-4

4. Metastasis

ETIOLOGY Geographical – sun, UV, oxygen deficiency Environmental – asbestos, benzene, phenol Age – breast, prostrate Hereditary – protooncogenes, tumour suppressor genes, DNA repair Acquired – hyperplastic, dysplastic, gastritis induced, leukoplakia (betel leaf)

CELL CYCLE AND CANCER

Apoptosis Oncogenes Tumor Suppressor Inv. and Mets Angiogene sis Cell cycle CURRENT TARGETS

12 MOLECULAR BASIS OF CANCER

POSSIBLE CHECKPOINTS FOR RETARDING CANCER GROWTH

PHARMACOLOGY OF ANTINEOPLASTIC AGENTS NEXT LECTURE

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