Ebv Infection And Transformation Of Epithelial Cells In Vitro
Although EBV readily infects and transforms B lymphocytes, it has been difficult to infect or transform human epithelial cells. Evidence of EBV infection of epithelial cells in vitro could be detected with wild-type strains obtained directly from throat washings but not laboratory isolates 91 . The difficulty of infecting epithelial cells may be due to differences in expression of the EBV receptor, CD21 or CR2. There is conflicting evidence for expression of the receptor, dependent on the...
Treatment Of Cervical Sil
As described previously, the first step in the workup of CSIL is performance of cervical cytology. If an abnormal cytology has been obtained, the two major decision points in the management algorithm for treatment of CSIL are 1 whether or not to perform colposcopy and 2 whether or not treat a cervical lesion once it has been biop-sied and the histopathology of the lesion has been established. A number of different organizations have published guidelines for cervical cytology screening in women....
Classification Of Retroviruses
Retroviruses Family Retroviridae were taxonomically divided into three subfamilies the Oncovirinae, which include those with oncogenic potential but also other virus strains the Lentivirinae, including HIV, and the prototype, visna virus of sheep which causes slow, progressive degeneration of the central nervous system and the Spumavirinae, or foamy viruses, which have not been shown to be pathogenic. More recently, retroviruses have been classified into seven distinct genera by dividing...
Changes In Cervical Cancer Incidence In The United States
Cancer of the cervix is the third most common cancer of the female genital tract, following uterine cancer and ovarian cancer, respectively. From 1950 to 1991, data from the Surveillance, Epidemiology, and End Results SEER Program show that the incidence of cervical cancer declined nearly 77 among Caucasian women. However, a slight increase in cervical cancer was detected between 1986 and 1991 among women of all races, rising from 8.0 100,000 between 1981 and 1985 to 8.7 100,000 between 1986...
Screening And Treatment Algorithms For Anal Hsil
The data presented here indicate a high prevalence of ASIL among both HIV-positive and HIV-negative MSM, as well as a high incidence of HSIL and a high incidence of anal cancer among both HIV-positive and HIV-negative MSM. Given the similarity between cervical and anal cancer, it is possible that an anal cytology screening program in high-risk populations may reduce the incidence of anal cancer, similar to the reduction in cervical cancer associated with implementation of cervical cytology...
Xlp And Malignant Lymphoma
One of the three major phenotypes of XLP is malignant lymphoma, beginning with several patients in the original Duncan pedigree who were so affected. In one, tumor involved the ileum, colon, and pancreas in a second, lymphoma involved the brain 1 . Since these initial cases, 28 of the patients in the Registry have developed malignant lymphoma. The most common types of B-cell lymphoma that occur in XLP are small noncleaved cell Burkitt's type and diffuse large cell lymphomas 29-31 . In 17 cases...
Info Qnx
a Mortality rates are per 100,000 per annum, age adjusted. b Ranking of site for cancer mortality within the country. a Mortality rates are per 100,000 per annum, age adjusted. b Ranking of site for cancer mortality within the country. the mortality increased by 30 in Hungary and Czechoslovakia and by similar amounts in Sweden and Denmark 5 . However not all high-risk countries showed such an increase and the mortality decreased in Austria and Germany 5 . Mortality rates in North America, much...
Hepatitis C Virus Infection
Since its identification in 1989 1,2 , hepatitis C virus HCV has been recognized as the major causative agent of posttransfusion and sporadic parenterally transmitted non-A-non-B hepatitis 3 . HCV is a single-stranded, positive-sense RNA virus showing significant similarities of genomic organization with pestiviruses. The introduction of second- and third-generation enzyme-linked immunosorbent assay ELISA and RIBA tests significantly improved the diagnostic procedures for the detection of...
Hepatitis B Virus
HBV is the first human hepatitis virus from which the proteins and genome could be identified and characterized. Before discovery of the viruses, two types of hepatitis hepatitis A for infectious hepatitis and hepatitis B for serum hepatitis were differentiated on the basis of transmission routes and other epidemiologic characteristics 4 . Hepatitis A virus HAV was transmitted by the fecal-oral route, whereas hepatitis B virus HBV was transmitted parenterally. In 1963, Blumberg et al. Studied...
Chromosomal Translocation Oncogene Activation And Bl Development
A major breakthrough came from the observation that the majority of B-cell malignancies, and for that matter all BL tumors, exhibit chromosomal changes, the most common being a reciprocal chromosomal translocation of the immunoglobulin heavy-chain sequences of chromosome 8q to chromosome 14q, as detected in 75 of BL cases 69 . These chromosome alterations are not dependent on EBV infection. The translocation between chromosomes 8 and 2, observed in 16 of BL cases, involves the X light-chain...
Typhoid And Paratyphoid Infection
Typhoid and paratyphoid fevers have been described in detail by Benenson 12 . Typhoid fever is a systemic disease characterized by onset of sustained fever, headache, malaise, anorexia, etc. It is caused by the bacterium Salmonella typhi, which can be isolated from the blood, feces, and urine of patients. The usual fatality rate of 10 can be reduced to lt 1 with prompt antibiotic treatment. Paratyphoid fever presents a similar clinical picture but tends to be milder and the case fatality rate...
Treatment Of Patients With Aidslymphoma
Systemic Chemotherapy for Newly Diagnosed Disease AIDS-lymphoma is never considered truly localized, in terms of treatment decisions. The only exception is primary CNS lymphoma, which, by definition, is confined to the brain, and may be treated with local cranial radiation. In all other cases, despite what may appear to be localized disease, systemic chemotherapy is advocated, as opposed to local radiation or surgical excision alone. At the outset of the AIDS epidemic in the early 1980s, the...
The Relationship Between Ebv And Burkitts Lymphoma
Nearly all, that is, up to 98 , of the biopsies of African BL tumors contain EBV genomes 41,42 . In contrast, only 20 of the biopsies of sporadic European or American BL cases, as determined by histopathology, contain EBV sequences 43 . In the tumor cells, EBV DNA remains episomal, as superhelically twisted circular molecules, with six to more than 100 copies per cell 44 . RNA transcripts from various EBV genes, representing 3-6 of the EBV genome, can be detected in tumor cells. Cultured BL...
Animal Models For Helicobacterinduced Gastric Cancer
Although administration of V-nitro chemicals with and without salt in animals addressed the possible roles and mechanisms of promoters and nitrosamine induced gastric cancer, it now is clear that H. pylori is an important factor in gastric tumorigen-esis. Furthermore, despite the presence of high nitrites in drinking waters and possible mutagenicity of nitrosated foods, the inconsistency of epidemiologic data suggests that high levels of dietary nitrites nitrates and high-salt diets alone are...
Mechanisms Of Retroviral Oncogensis
Oncogenesis is a multifactorial, multistep process requiring several genetic changes within a neoplastic cell lineage before malignancy becomes manifest. Retroviruses can play a role in these processes by a number of different mechanisms, some direct, some indirect. Directly acting oncogenic retroviruses are those in which the cancer cell precursor is infected by the virus that integrates into host DNA. Usually the viral genome persists and can be readily detected in the tumor tissue. Indeed,...
Detection Of Csil And Treatment Of Cin In Hivpositive Women
HIV-positive women are advised to have a comprehensive gynecologic examination including a cervical cytology smear as part of their initial medical evaluation. If initial results are normal, at least one additional smear should be obtained in 6 mo to exclude a false-negative result on the initial cytology. If the second smear is normal, HIV-infected women should be advised to have an annual smear, similar to HIV-negative women. If the initial or follow-up cytology shows ASCUS or CSIL, the woman...
Introduction Jgj
Kaposi's Sarcoma History and Pathology As medical students in 1987 at Kalafong Hospital Tembisa, South Africa we were intrigued by a patient with tuberculosis and disseminated skin lesions. This was the first patient we had seen who was infected with the human immunodeficiency virus HIV , and he had Kaposi's sarcoma KS . We never imagined then that 10 yr later most patients at this hospital, as in many other South African hospitals, would have AIDS-related illnesses. One in eight South Africans...
References Oes
1. Ko CB, Walton S, Keczkes K, et al. The emerging epidemic of skin cancer. Br J Dermatol 1994 130 269-272. 2. Proby C, Storey A, McGregor J, Leigh I. Does human papillomavirus infection play a role in non-melanoma skin cancer Papillomavirus Rep 1996 7 53-60. 3. Zur Hausen H. Papillomavirus infections a major cause of human cancers. Biochim Biophys Acta 1996 1288 F55-78. Majewski S, Jablonska S. Epidermodysplasia verruciformis as a model of human papillo-mavirus-induced genetic cancer of the...
Pathology Of Nasopharyngeal Carcinoma And Association With Epsteinbarr Virus
The Epstein-Barr virus EBV is associated with malignancies that arise in both B lymphocytes and epithelial cells, including Burkitt's lymphoma, immunodeficiency-related lymphoma, and nasopharyngeal carcinoma NPC 1,2 . The malignancies associated with EBV develop years postinfection, suggesting that they represent some form of reactivated infection. Nasopharyngeal carcinoma is an unusual tumor with intriguing epidemiologic and biologic characteristics. The tumor occurs worldwide but with...
Introduction Qxr
The idea that infection may play a causal role in the etiology of leukemia has an antiquity equivalent to the recognition of leukemia as a disease indeed some early descriptions regarded leukemia as a pathological response to infection rather than a malignancy. It was recognized that the general age-associated incidence of pediatric leukemia appeared to mirror that of common infections such as diphtheria and measles. Reports of infections preceding or copresenting with a diagnosis of leukemia...
Introduction To Herpesviruses
Identification of a virus in the family Herpesviridae is based on the morphology of the virus particle. Viewed through an electron microscope, the virions of different members of the Herpesviridae family are indistinguishable and consist of four distinct components the core, capsid, tegument, and envelope Fig. 1 1 . The core contains a double-stranded DNA genome arranged in an unusual torus shape that is located inside an icosadeltahedral capsid that is approx 100 nm in size and contains 162...
Incidence And Risk Factors
The incidence of posttransplant lymphproliferative disorder PTLD varies according to the organ transplanted, the series reported, the immunosuppressive regimens used, and the age grouping of transplant recipients. Reviewing thoracic organ transplants over a 10-yr period at the University of Pittsburgh, Armitage et al. noted a 3.4 incidence following heart transplantation, and a 7.9 incidence following lung transplantation 2 . Determining the true incidence of PTLD has been difficult, as series...
References Uzo
1. Beral V, Peterman T, Berkelman R, Jaffe H. AIDS associated non-Hodgkin lymphoma. Lancet 1991 337 805-809. 2. Peters BS, Beck EJ, Coleman DG, Wadsworth MJH, McGuinness O, Harris JRW, et al. Changing disease patterns in patients with AIDS in a referral centre in the United Kingdom the changing face of AIDS. Br Med J 1991 302 203-207. 3. Cote TR, Biggar RJ, Rosenberg PS, Devesa SS, Percy C, Yellin FJ, et al. Non-Hodgkin's lymphoma among people with AIDS incidence, presentation and public health...
Clonality of EBV in NPC
Nasopharyngeal carcinoma cells cannot be cultivated in vitro, and it is a rare tumor that can be transplanted into nude mice 21 . Therefore EBV infection in NPC has been primarily characterized through analyses of viral nucleic acids and proteins in samples obtained at biopsy 16,22,23 . In latent infection, EBV DNA is detected as an extrachromosomal, circular episome. In permissive infection also called replicative or lytic infection , linear DNA is packaged into virions 24 . In NPC samples,...
Hhv8 Immunity
The introduction of aggressive anti-HIV therapies has led to a decline in the incidence of KS in AIDS patients and also in the resolution of KS in those already affected 218 . This suggests that cellular immune responses, compromised in AIDS but recovering after highly active antiretroviral therapy HAART , could be important in the control of HHV-8 infection and in the development of KS. Like EBV, HHV-8 probably establishes a persistent infection that is normally controlled by the immune...
Pathogenesis Of Ebvassociated Leiomyosarcoma
It is of note that presentation with multiple tumor nodules is common in immuno-compromised persons who develop leiomyosarcomas. The most significant evidence of EBV infection of the muscle cells prior to malignant transformation is the finding of EBV monoclonality of leiomyosarcomas 50,51,61 . Of the tumors that have been tested, only monoclonal episomal EBV was found, indicating that EBV infection preceded malignant transformation there was no viral integration into the cell genome to account...
The Gene Mutated In Xlp And Its Product
Without a clear idea concerning the nature of the biochemical defect in XLP, the initial efforts to find the gene were focused on mapping the genomic region of the disease. The inheritance pattern narrowed this to 160 cM, the size of the X chromosome. Genetic linkage studies indicated that the XLP gene was linked to DXS42 and DXS37 of Xq25 38 . Subsequently, interstitial deletions involving Xq25 were identified by cytogenetic and molecular techniques 39,40 . Haplotype analysis completed the...
Hhv8 Genome
The genome of HHV-8 was mapped and sequenced from cosmid and phage genomic libraries from a PEL cell line BC-1, which also contains EBV 150 . HHV-8 also was sequenced from a KS biopsy, and the genome was found to be almost identical to that in PEL 151 . The HHV-8 genome consists of an estimated 140.5-kb long unique coding region LUR flanked by approx 800-bp noncoding tandemly repeated units with an 85 G C content. More than 80 ORFs have thus far been identified, including nearly 70 with...
Epidemiology Of Gallbladder Cancer
The epidemiology of cancer of the gallbladder and biliary tract has been reviewed by Mack and Menck 3 , by Hill 4 , and by Zatonski et al. 5 . It is a relatively uncommon cancer in Europe but with a very poor prognosis. Table 1 shows data 6 in which the mortality from gallbladder cancer can be compared with that of cancer of the stomach and of the large bowel. In men there is no country for which it is higher than the 12th commonest cancer site, although for women it reaches as high as 6th to...
References Mjt
1. Parkin DM, Pisani P, Ferlay J. Estimates of the worldwide incidence of 25 major cancers in 1990. Int J Cancer 1999 80 827-841. 2. Murray CJL, Lopez AD. Mortality by cuase for eight regions of the world Global Burden of Disease study. Lancet 1997 349 1269-1276. 3. Coleman MP, Esteve J, Damiecki P, Arslan A. Renard H. Tends in cancer incidence and mortality. Lyon International Agency for Research on Cancer, 1993 pp. 192-224. 4. Ries LAG, Kosary CL, Hankey BF, Miller BA, Edwards BK eds . SEER...
Risk Factors For Anogenital Sil And Cancer Other Than Hpv Infection
Clearly HPV infection is one of the most important risk factors for anogenital SIL and cancer, and HPV infection is likely to be necessary for development of almost all of these lesions. Sexual risk factors such as number of sexual partners, age at first intercourse, and parity have long been associated with cervical cancer, but these likely reflect risk for acquisition of HPV infection. However, although the age-related prevalence of cervical LSIL parallels that of infection, only a small...
Immunotherapy With Ebv As A Therapeutic Target
HD is curable in 80 of cases with combination chemotherapy and or radiation therapy. In those cases where cure is not achieved or patients are unable or unwilling to accept the risks associated with standard therapy, immunotherapy may provide an alternative therapeutic option. Immunotherapy is any treatment that exploits the specificity of the immune system to limit disease progression or effect cure. It may be active as in the case of vaccines or passive as in the case of infused CTLs. Its...
Natural History Of Cervical Hpv Infection And Csil
There are more than 100 anogenital HPV types and these are generally divided into oncogenic and nononcogenic types by virtue of the frequency of their association with invasive cervical cancer see Chapter 14 . Of the oncogenic types, HPV-16 is the most important because it is the most common type found in cervical cancer, followed by HPV types 18, 31, and 45. HPV 16 alone counts for about 50 of all cervical cancers worldwide 4 . HPV types 18, 31, and 45 are associated with an additional 20 of...
Info Vts
a C-type virions, concentric core condenses under plasma membrane during the budding of virus particles B-type, cytoplasmic core eccentric after budding D-type, cytoplasmic core concentric cone-shaped cores. Lentiviruses have cone-shaped cores spumaviruses have prominent envelope spikes. a C-type virions, concentric core condenses under plasma membrane during the budding of virus particles B-type, cytoplasmic core eccentric after budding D-type, cytoplasmic core concentric cone-shaped cores....
Guy De The Burkitt S Lymphoma
1. Purtilo DT, Yang JPS, Cassel CK, Harper R, Stephenson SR, Landing BH, Vawter GF. X-linked recessive progressive combined variable immunodeficiency Duncan's disease . Lancet 1975 1 935-941. 2. Centers for Disease Control Surveillance for AIDS-defining opportunistic illnesses, 19921997. Morbid Mortal Weekly Rep 1999 48 No. SS-2 1-22. 3. Thamavit W, Shirai T, Ito N. Liver flukes and biliary cancer. In Parsonnet J ed. Microbes and Malignancy Infection as a Cause of Human Cancers. New York Oxford...
References Uai
1. Moertal CG. The gallbladder. In Holland JF, Frei F, eds . Cancer Medicine. Philadelphia Lea amp Febriger, 1982, pp. 1782-1785. 2. Shearman DJ, Finlayson ND. Diseases of the Gastrointestinal Tract and Liver. Edinburgh Churchill Livingstone, 1989, pp. 1043-1044. 3. Mack TM, Menck HR 1982 . Epidemiology of cancer of the gallbladder and biliary passages. In Correa P, Haenszel W eds . Epidemiology of Cancer of the Digestive Tract. The Hague Mar-tinus Nijhoff, 1982, pp. 227-242. 4. Hill MJ ed ....
Biliary Tract Cancer In Typhoid Carriers
There is a growing body of evidence that typhoid-carriers are at increased risk of biliary tract cancer. There have been numerous single case reports of biliary tract cancer in typhoid carriers, but the earliest study of a large number of cases was by Vogelsang 28 , who in 1950 reported a cohort of 71 typhoid carriers of whom 47 had died. Of those three 6.49 died of biliary tract cancers. A cohort of 210 Californian carriers was reported in 1962 26 , of whom 13 died of hepatobiliary cancers 6.1...
Info Los
The most famous carrier, Typhoid Mary, a cook in New York, is thought to have caused more than 1300 cases of typhoid between 1901 and 1914 16 . In another unusual case in Scotland, a 65-yr-old housewife developed typhoid fever, having been infected by her husband, who had had typhoid fever in Poland 31 yr previously 17 . Foci of S. typhi or less commonly S. paratyphi infection may persist in the gallbladder, liver, biliary tract, kidney, or renal tract although the latter two give chronic...
1898 341-343 Transmission Of Warts In The Dog
1. M'Fadyan J, Hobday F. Note on the experimental transmission of warts in the dog. J Comp Pathol Ther 1898 11 341-343. 2. Rous P. Transmission of a malignant new growth by means of a cell-free filtrate. Am J Med Assoc 1911 56 198-211. 3. Ellermann V, Bang O. Experimentelle Leuk mie bei H hnern. Centralbl F Bakt Abt I Orig 1908 46 595-609. 4. Ciuffo G. Innesto positivo con filtrado di verrucae volgare. G Ital Mal Venereol 1907 48 12-17. 5. Rous P, Beard JW. Carcinomatous changes in...
References Wyq
1. Bilharz T. Further observations concerning Distomum hematobium in the portal vein of man and its relationships to certain pathological formations. Zeitschrift Fur Wissenschaftliche Zoologie 1852 4 72-76. 2. Goebel C. On bilharzia disease occurring with bladder tumors with special reference to carcinoma. Zeitschrift Fur Krebsforschung 1905 3 369-513. 3. Hashem M. The etiology and pathogenesis of the bilharzial bladder cancer. J Egypt Med Assoc 1961 44 857-966. 4. Gillman J, Prates MD....
Introduction Yio
A relatively recent scientific finding over the past decade has been the chronicle of epidemiologic and virologic investigations that have documented the increased frequency of smooth muscle cell tumors in immunocompromised persons, and the unexpected association of these tumors with Epstein-Barr virus EBV infection of smooth muscle cells. In 1965, Nobel laureate Sir MacFarlane Burnet emphasized the critical role of immunosurveillance in limiting malignant transformation and development of...
Retrovirus Replication And Transmission
Retroviruses are so called because they go backwards in genetic information flow, that is, they synthesize DNA from an RNA template. This step occurs early in the replication cycle of retroviruses Fig. 1 . The extracellular, transmissible virus particles contain duplicate strands of RNA, with which the enzyme molecules of reverse tran-scriptase are already associated. After binding to cell surface receptors, fusion with the cell membrane and uncoating, reverse transcription is activated in the...
References Pzy
1. Parkin DM, Pisani P, Ferlay J. Estimates of the worldwide incidence of 18 major cancers in 1985. Int J Cancer 1993 54 1-13. 2. Bosch FX. Global epidemiology of hepatocellular carcinoma. In Okuda K, Tabor E eds . Liver Cancer. New York Churchill Livingstone, 1997, 13-28. 3. Kew MC. Hepatic tumors and cysts. In Feldman M, Scharschmidt BF, Sleisenger MH eds . Gastrointestinal and Liver Disease. Pathophysiology Diagnosis Management. Philadelphia WB Saunders, 1998, pp. 1364-1387. 4. Prates MD,...
Bcll
Morphology Cytology corresponds to the one described in MLDUS the lymph node structure is diffusely effaced with infiltration of the capsule and obliteration of the sinuses in the spleen, there is involvement of both the white and red pulp. Genotype Molecular studies regularly show clonal rearrangements of Ig encoding genes. Morphology Cytology is the same as in Ic-like MLDUS the lymph node structure is diffusely effaced with preservation and partial dilatation of the sinuses in the spleen,...
Conclusion 1
Schistosomal carcinogenesis may therefore be summarized as follows Fig. 1 1. The presence of S. haematobium eggs in the mucosal layers of the bladder results in metaplasia as well as reparative hyperplasia of the epithelium, leading to an increased cell turnover that may escape growth control mechanisms. It may also enhance already existing minute foci of intra-epithelial neoplasia. 2. As bacterial infection, notably mixed, forms part of the pathology of schistosomal bladders, the effect of...
Info Yfp
Through the ISD linkage system we identified those members of our cohorts who had had cholecystectomy between infection and death Table 7 , and therefore could not develop subsequent gallbladder cancer. Of the 83 carriers, 16 19 had undergone cholecystecomy. In comparison, only 8 of the 386 noncarrier cases 2 had had cholecystecomy. Thus, the prevalence of cholecystecomy in carriers was 6.1 times higher than in cases. Thus, the risk of gallbladder cancer in typhoid carriers with an intact...
Conclusions And Prospects
Retroviruses have played an immensely informative role in elucidating the genetic basis of cancer. Animal retroviruses have arguably been more important for understanding nonretroviral human cancers than those caused by HTLV-I or HIV. These human pathogens, however, could not have been investigated so rapidly without a knowledge of animal retroviruses. For instance, both HTLV-I and HIV were initially discovered through assays in culture for reverse transcriptase, previously developed for animal...
Human Retroviruses
Five groups of retrovirus have been reported as human infections 1. Human immunodeficiency viruses types 1 and 2 HIV-1 and HIV-2 are the lentiviruses that cause acquired immune deficiency syndrome AIDS . Before the term HIV was coined in 1986, HIV was called LAV or HTLV-III. 2. Human T-lymphotropic viruses, type I and type II HTLV-I and HTLV-II , cause adult T-cell leukaemia and neurologic disease see Chapter 13 . 3. Human foamy virus HFV is a spumavirus originally detected in cultured...
Serology Of Htlvi
Anti-HTLV-I antibodies are positive in almost patients with ATL, although seronegative ATL cases have been reported 50,51 . There is no difference between ATL patients and HTLV-I carriers in the pattern of serum antibodies. The presence of serum antibodies to HTLV-I can be demonstrated by enzyme-linked immunosorbence, gelatin particle hemagglutination, indirect immunofluorescence, and Western blotting assays 52 . Carriers with a high level of anti-HTLV-I antibody and a low titer of anti-Tax...
References Gep
1. Burkitt DP. A sarcoma involving the jaws in Africa children. Br J Surg 1958 46 218-223. 2. O'Conor GT. Malignant tumors in African children. II. A pathological entity. Cancer 1961 14 270-283. 3. Burkitt DP. A children's cancer dependent on climatic factors. Nature 1962 194 232-234. 4. Burkitt DP. Determining the climatic limitations of a childrens tumor common in Africa. Br Med J 1962 2 1019-1023. 5. Kafuko GW, Burkitt DP. Burkitt lymphoma and malaria. Int J Cancer 1970 6 1-9. 6. Epstein MA,...