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Ultima Vez Modificado: 1 de noviembre del 2001
Table of Contents
CancerMail from the National Cancer Institute
UI - 21319829
AU - Korkolopoulou PA; Angelopoulou MK; Kontopidou FN; Patsouris EV; Christodoulou PN; Kittas CN; Davaris P; Pangalis GA
TI - Retinoblastoma gene product and P21 (WAF1, CIP1) protein expression in non Hodgkin's lymphomas: a multivariate survival analysis.
SO - Leuk Lymphoma 2001 Feb;40(5-6):647-58
AD - Department of Pathology, University of Athens, Greece.
We evaluated immunohistochemically the expression of two negative regulators of the cell cycle, namely retinoblastoma gene product (pRb) and WAF1/Cip1 gene product (p21), in paraffin sections from 93 patients with non-Hodgkin's lymphomas (NHL) and related it to clinicopathological parameters, proliferative fraction, p53 expression and survival. Patients were followed until death (n=33) or for an average of 52 months (60-160). Rb labelling index (LI) increased with malignancy grade and proliferative activity but was unrelated to other clinicopathological parameters. In 33% of cases, especially those of the aggressive groups, we observed diminished pRb expression (i.e. low pRb/Ki-67 ratio). p21 expression on the other hand correlated only with histological grade, Rb LI and p53 LI. In multivariate analysis, Rb LI was a negative predictor of disease-free survival but was linked to a higher probability of complete response. However, diminished pRb expression as well as p21 expression were not statistically significant prognostic indicators. Our results suggest that pRb as a cell cycle related molecule may play an important role in determining prognosis and therapeutic response in NHL patients.
UI - 21261633
AU - Amiel A; Elis A; Blumenthal D; Gaber E; Fejgin MD; Dubinsky R; Lishner M
TI - Modified order of allelic replication in lymphoma patients at different disease stages.
SO - Cancer Genet Cytogenet 2001 Mar;125(2):156-60
AD - Genetic Institute and Department of Medicine and Hematology, Meir Hospital, Sapir Medical Center, Kfar-Saba, Israel. email@example.com
Asynchronous replication of homologous loci was reported in lymphocytes of patients with lymphoma, ovarian and renal cancer as well as in lymphocytes of patients with premalignant conditions, for example, essential mixed cryoglobulinemia associated with hepatitis C virus and in monoclonal gammopathy of unknown significance. In the present study we evaluated the replication pattern in lymphocytes of four groups of patients with intermediate grade of non-Hodgkin lymphoma at various stages of their disease: 1) at diagnosis; 2) during cytotoxic treatment; 3) in remission; and 4) in relapse. A significantly higher proportion of the asynchronous pattern of replication at diagnosis, during cytotoxic treatment, and in relapse was noted as compared to healthy controls and to patients who achieved remission of their lymphoma. Also, the frequency of the two doublets (DD) pattern in every group studied was significantly lower than in the controls. If our findings can be confirmed in larger, long-term prospective studies, it may allow the use of a simple and inexpensive tool to closely observe patients with lymphoma who are at high risk for relapse.
UI - 21411570
AU - Chen D; Gallie BL; Squire JA
TI - Minimal regions of chromosomal imbalance in retinoblastoma detected by comparative genomic hybridization.
SO - Cancer Genet Cytogenet 2001 Aug;129(1):57-63
AD - Division of Cancer Informatics, Ontario Cancer Institute/Princess Margaret Hospital, University Health Network, 610 University Avenue, M5G 2M9, Toronto, Canada.
Mutation of both alleles of the retinoblastoma gene (RB1) initiate oncogenesis in developing human retina, but other common genomic alterations are present in the tumors. In order to sublocalize the altered genomic regions, 50 retinoblastoma tumors were examined by comparative genomic hybridization (CGH). The minimal regions most frequent gained were 1q31 (52%), 6p22 (44%), 2p24-p25 (30%) and 13q32-q34 (12%). The minimal region most frequently lost was 16q22 (14%). The overall total number of gains or losses evident on CGH was significantly greater in those tumors with either or both 6p or 1q gain, than in tumors with neither 6p nor 1q gain suggesting that chromosomal instability may be associated with acquisition of these changes. Genes mapping to 6p22 and 1q31 may be important in tumor development in retina subsequent to the loss of RB1 alleles.
UI - 21218721
AU - Hertzberg H; Kremens B; Velten I; Beck JD; Greil J
TI - Recurrent disseminated retinoblastoma in a 7-year-old girl treated successfully by high-dose chemotherapy and CD34-selected autologous peripheral blood stem cell transplantation.
SO - Bone Marrow Transplant 2001 Mar;27(6):653-5
AD - University Hospital for Children and Adolescents, Friedrich-Alexander University of Erlangen-Nurnberg, Germany.
A localized retinoblastoma of the left eye in a 7-year-old girl, was treated by enucleation. She received no additional therapy. Four months later, metastases of retinoblastoma in the lymph nodes, bone and bone marrow were diagnosed. Relapse chemotherapy consisting of three courses of vincristine, cyclophosphamide, etoposide and carboplatin led to a second complete remission. Subsequent high-dose chemotherapy with thiotepa, etoposide and carboplatin and autologous stem cell transplantation with CD34-selected stem cells were successful, with no adverse effects. No radiotherapy was given and the girl remains in continuous second remission with a follow-up of more than 4 years.
UI - 21421106
AU - Brito-Babapulle V; Baou M; Matutes E; Morilla R; Atkinson S; Catovsky D
TI - Deletions of D13S25, D13S319 and RB-1 mapping to 13q14.3 in T-cell prolymphocytic leukaemia.
SO - Br J Haematol 2001 Aug;114(2):327-32
AD - Academic Department of Haematology and Cytogenetics/Institute of Cancer Research, London, UK. firstname.lastname@example.org
Deletions of 13q14.3 are well known in several malignancies and are thought to be associated with tumour suppressor function. The RB-1 gene is a tumour suppressor gene, but other loci including D13S319 and D13S25 telomeric to this within 13q14.3 are deleted in B-cell chronic lymphocytic leukaemia (B-CLL), multiple myeloma and non-Hodgkin's lymphoma, with varying clinical significance. The fluorescence in situ hybridization screening of 22 patients with T-prolymphocytic leukaemia (T-PLL) for deletions of 13q14.3 revealed loss of D13S25 in 17 cases (mean 40% range 13-98%), with 11 patients having at least a 20% deletion. Mapping the deletions for the RB-1, D13S319,and D13S25 loci revealed D13S25 as the most frequently deleted marker. However, patients with only the D13S25 deletion had low percentages of cells with the deletion (12-13%), suggesting that loss of D13S25 on its own may not provide sufficient growth advantage. The use of the YAC 954c12, which maps immediately adjacent to D13S25, defined the telomeric border of the deletion in some of the cases. Inv(14)(q11q32) and t(14;14)(q11;q32) are characteristic of T-PLL, but are also observed in premalignant T-cell clones in patients with ataxia telangiectasia. Transition to overt leukaemia may result from loss of suppressor function. Thus, 13q14.3 deletions could contribute to the development of overt leukaemia in T-PLL, but the involvement of more than one gene in the region cannot be excluded.
UI - 21430665
AU - Shields CL; Meadows AT; Shields JA; Carvalho C; Smith AF
TI - Chemoreduction for retinoblastoma may prevent intracranial neuroblastic malignancy (trilateral retinoblastoma).
SO - Arch Ophthalmol 2001 Sep;119(9):1269-72
AD - Ocular Oncology Service, Wills Eye Hospital, 900 Walnut St, Philadelphia, PA 19107. email@example.com
OBJECTIVE: To evaluate whether neoadjuvant intravenous chemotherapy (chemoreduction) for retinoblastoma reduces the risk for associated intracranial neuroblastic tumor (trilateral retinoblastoma). DESIGN: Retrospective consecutive case series. PARTICIPANTS: Two hundred fourteen consecutive children with newly diagnosed retinoblastoma treated at a major ocular oncology center from January 1, 1995, to July 1, 1999. MAIN OUTCOME MEASURE: Development of associated intracranial neuroblastic tumor (trilateral retinoblastoma). RESULTS: During the 54-month study period, 142 patients (66%) received chemoreduction (consisting of vincristine sulfate, etoposide phosphate, and carboplatin therapy) as part of their treatment strategy (chemoreduction group), whereas 72 (34%) were treated with nonchemoreduction methods (nonchemoreduction group). In the chemoreduction group, no associated intracranial neuroblastic tumor developed during the mean 47-month follow-up. Based on a recent meta-analysis of the prevalence of trilateral retinoblastoma, we would have expected the intracranial tumor to develop in 5 to 15 patients with hereditary retinoblastoma. This lack of associated trilateral retinoblastoma in the chemoreduction group was significantly less than expected using binomial distribution (P<.001). In the nonchemoreduction group, associated intracranial tumor (pinealoblastoma) developed in 1 patient, a finding consistent with the expected frequency. CONCLUSION: Chemoreduction protects against the highly fatal associated intracranial neuroblastic tumor (trilateral retinoblastoma). This observation is especially important in children with bilateral or familial retinoblastoma who are at greatest risk for this brain tumor.
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