Test bank for robbins and cotran pathologic basis of disease 9th edition by kumar

http://getbooksolutions.com Link full download:https://getbooksolutions.com/download/test-bank-for-robbinsand-cotran-pathologic-basis-of-disease-9th-edition-by-kumar Test Bank for Robbins and Cotran Pathologic Basis of Disease 9th Edition by Kumar Chapter 07: Neoplasia Test Bank MULTIPLE CHOICE Which of the following tumors occurs most often in the ovary? Chondroma Hemangioma Leiomyoma Transitional cell papilloma Cystadenoma ANS: E, Cystadenomas, which may contain serous fluid or mucin and are thus called serous or mucinous cystadenomas, are typically found in the ovary These benign tumors have malignant counterparts known as cystadenocarcinomas Which one of the following carcinomas is locally invasive but rarely forms metastases in lymph nodes and distant sites? Basal cell carcinoma of the skin Squamous cell carcinoma of the skin Oat cell carcinoma of the lung Transitional cell carcinoma of the urinary bladder Adenocarcinoma of the stomach ANS: A, Basal cell carcinomas of the skin, the most common malignant tumor in the human body, is a locally invasive malignant tumor, which, if untreated, could http://getbooksolutions.com ultimately kill the host However, these tumors are usually diagnosed early and removed adequately, so that they almost never metastasize Pseudomyxoma peritonei is a complication of which tumor? Serous cystadenoma of the ovary Mucinous cystadenoma of the ovary Ovarian fibroma Myxoma of the heart Myxosarcoma of the lower extremity ANS: B, Pseudomyxoma of the ovary usually results from peritoneal seeding of mucin-secreting tumors of the ovary or the gastrointestinal tract, and most often the appendix Although the ovarian tumor is benign, the implants of the tumor cells seeding the peritoneal cavity can be difficult to eradicate The cells continue to secrete mucin and fill the abdominal cavity, colloquially known as “jelly-belly.” Which mechanism affecting the genes or chromosomes accounts for the activation of the c-myc protooncogene in Burkitt lymphoma cells? Overexpression Amplification Point mutation Translocation Inactivation of its promotor ANS: D, Translocation of the c-myc protooncogene from its normal site on chromosome to chromosome 14 results in the formation of the myc oncogene and plays a major role in the pathogenesis of Burkitt lymphoma Homogeneous staining regions (HSR) of chromosome 2p, the site of the Nmyc gene, are adverse prognostic signs if found in neuroblastoma cells HRS are evidence of gene deletion amplification http://getbooksolutions.com point mutation translocation 10 inversion ANS: B, Homogeneous staining regions and double minutes are signs of gene amplification Amplification of the N-myc oncogene in neuroblastoma cells is a poor prognostic finding In which cell function is BRCA1, a gene mutated in women with familial breast carcinoma, involved? Cell adhesion Growth inhibition Signal transduction 10 Cell surface channel 11 Transcriptional regulation and DNA repair ANS: E, BRCA1 and BRCA2 are tumor suppressor genes whose true function has not been fully elucidated It is thought that they participate in the transcriptional regulation and interact with proteins that regulate double-strand DNA repair Germ line mutation of E-cadherin is found in familial cases of lymphoblastic lymphoma Ewing sarcoma 10 neuroblastoma 11 gastric carcinoma 12 seminoma ANS: D, E-cadherin is a cell-to-cell adhesion molecule that serves to hold many epithelial cells together This surface adhesion molecule is often lost in adenocarcinomas, accounting for the invasive growth of these neoplasms Germ line mutation of the E-cadherin gene has been found in families with gastric carcinoma http://getbooksolutions.com Germ line mutation of the Von Hippel–Lindau (VHL) gene is associated with formation of retinal angiomas and glioblastoma multiforme 10 oligodendroglioma 11 neurinomas 12 ependymomas 13 cerebellar hemangioblastomas ANS: E, Von Hippel–Lindau syndrome was originally described as a syndrome comprising angiomas of the retina and hemangioblastomas of the cerebellum It is linked to the germ line mutation of the VHL tumor suppressor gene These patients are at risk of developing renal cell carcinoma and pheochromocytomas Mutations of the VHL gene also have been found in sporadic renal carcinomas unrelated to Von Hippel–Lindau syndrome Microsatellite instability, a marker of DNA mismatch repair, is typically found in 10 hereditary nonpolyposis colon cancer 11 familial adenomatous polyposis coli 12 T-cell lymphoma 13 B-cell lymphoma 14 myelogenous leukemia ANS: A, Mutations of human DNA mismatch repair genes play a pathogenetic role in the development of colonic cancers in families with hereditary nonpolyposis colon cancer (HNPCC) Due to the error in mismatch repair, the microsatellite sequences (normally fixed for life and the same in every tissue) expand They account for the microsatellite instability, a hallmark of all conditions with defective DNA mismatch repair 10 Matrix metalloproteinases secreted by tumor cells are important for which feature of malignant tumors? 11 Desmoplasia 12 Anaplasia 13 Invasiveness http://getbooksolutions.com 14 Apoptosis 15 Differentiation ANS: C, Matrix metalloproteinases, such as type IV collagenase, are important for the invasive growth of tumor cells These enzymes degrade the basement membranes and the extracellular matrix, allowing the tumor cells to penetrate into the tissues, lymphatics, and blood vessels 11 Which enzymes in the liver account for the activation of most procarcinogens into carcinogens? 12 Cytochrome P-450-dependent mono-oxidases 13 Aminotransferases 14 Hydroxylases 15 Glutathione dehydrogenase 16 Caspases ANS: A, Most of the exogenous procarcinogens are activated into carcinogens in the liver through the action of microsomal cytochrome P-450–dependent monooxidases found in the smooth endoplasmic reticulum of hepatocytes Susceptibility to carcinogens is in part determined by the polymorphism of genes that encode these enzymes 12 Which is the most common radiation-induced cancer in humans? 13 Thyroid cancer 14 Chronic lymphocytic leukemia 15 Breast cancer 16 Lung cancer 17 Salivary gland carcinoma ANS: B, Leukemias represent the most common radiation-induced cancer in humans, closely followed by thyroid cancer, which is the most common malignancy in young persons http://getbooksolutions.com 13 Helicobacter pylori infection predisposes to formation of gastric tumors, but the association between the bacterial infection and a gastric tumor is the strongest for 14 adenocarcinoma of the stomach 15 gastrointestinal stromal tumors 16 marginal zone lymphomas 17 T-cell lymphoma 18 Burkitt lymphoma ANS: C, The best and strongest evidence links Helicobacter pylori infection with the onset of mucosa-associated B-cell lymphomas (MALTomas) of the stomach, which are also known as marginal zone lymphomas It is thought that H pylori activates T cells, which in turn promote polyclonal proliferation of B cells in the gastric mucosa In this process, some cells obviously become malignant and give rise to T-cell independent low-grade monoclonal lymphomas 14 Clubbing of the digits, periosteal new bone formation on the metatarsals, metacarpals, and proximal phalanges, and arthritis of adjacent joints is a paraneoplastic syndrome most often associated with carcinoma of the 15 thyroid 16 larynx 17 bronchi 18 liver 19 stomach ANS: C, Clubbing of the fingers and related bone and joint changes of the hand and fingers are signs of hypertrophic osteoarthropathy, which most often occurs in patients with bronchogenic carcinoma The pathogenesis of these changes is not known Robbins and Cotran Pathologic Basis of Disease: 9th Edition Test Bank – Kumar