Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts: Gene/Protein Disease Symptom Drug Enzyme Compound   Target Concepts: Gene/Protein Disease Symptom Drug Enzyme Compound

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Query: UMLS:C0596263 (carcinogenesis)
64,820 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

ARLTS1 was recently identified in chromosome 13q14 as a tumor suppressor gene of the ADP-ribosylation factor family with pro-apoptotic characteristics. Additionally, one of its genetic variants (W149X) was hypothesized to be a polymorphism associated with familial cancer. We performed a large case-control association study within the EPICOLON project aimed at evaluating the sporadic and familial colorectal cancer (CRC) risk associated with ARLTS1 genetic variants. Whereas P131L and W149X did not seem to affect CRC risk, C148R did show, for the first time in CRC, statistically significant differences between cases and controls [odds ratio (OR) = 1.45, 95% confidence interval (95% CI) = 1.13-1.86, P = 0.003], sporadic cases and controls (OR = 1.59, 95% CI = 1.13-2.23, P = 0.007) and familial cases and controls (OR = 1.55, 95% CI = 1.10-2.19, P = 0.01) in agreement with a hypothetical moderate increase of the cancer risk linked to the C148R ARLTS1 variant, both in sporadic and familial CRC cases.
Carcinogenesis 2007 Aug
PMID:Association of the ARLTS1 Cys148Arg variant with sporadic and familial colorectal cancer. 1744 1

ARLTS1 (ADP-ribosylation factor-like tumor suppressor gene 1) is a member of the ARF family of the Ras superfamily of small GTPases that are known to be involved in multiple regulatory pathways altered in human carcinogenesis. Here, we review recent work that has provided insights into the role of this small gene as an emerging player in both familial and sporadic cancers of several histotypes. ARLTS1 is a low penetrance gene that is primarily dysregulated in sporadic lung cancer by promoter hypermethylation. Two ARLTS1 polymorphisms are also associated with familial cancer risk. Down-regulation of ARLTS1 is seen in all lung cancer cell lines studied and in a significant proportion (37%) of primary lung tumors. Restoration of ARLTS1 expression in ARLTS1-deficient lung cancer cell lines by either demethylation or adenoviral transduction leads to apoptosis via caspase-dependent mechanisms. Furthermore, ARLTS1 re-expression induces an in vivo decreased tumor growth in preclinical models of lung cancer. Microarray analysis of gene expression patterns in cells transduced with ARLTS1 demonstrates that various pathways involved in cell survival, proliferation and development mediate its pro-apoptotic effects.
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PMID:ARLTS1 - a novel tumor suppressor gene. 1837 53

Some cases of pancreatic cancer (PC) are described to cluster within families. With the exception of PALLD gene mutations, which explain only a very modest fraction of familial cases, the genetic basis of familial PC is still obscure. Here the literature was reviewed in order to list the known genes, environmental factors, and health conditions associated with PC or involved in the carcinogenesis of the pancreas. Most of the genes listed are responsible for various well-defined cancer syndromes, such as CDKN2A (familial atypical mole-multiple melanoma, FAMMM), the mismatch repair genes (Lynch Syndrome), TP53 (Li-Fraumeni syndrome), APC (familial adenomatous polyposis), and BRCA2 (breast-ovarian familial cancer), where PC is part of the cancer spectrum of the disease. In addition, in this review I ranked known/possible risk factors extending the analysis to the hereditary pancreatitis (HP), diabetes, or to specific environmental exposures such as smoking. It appears that these factors contribute strongly to only a small proportion of PC cases. Recent work has revealed new genes somatically mutated in PC, including alterations within the pathways of Wnt/Notch and DNA mismatch repair. These new insights will help to reveal new candidate genes for the susceptibility to this disease and to better ascertain the actual contribution of the familial forms.
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PMID:Genetic predisposition and environmental risk factors to pancreatic cancer: A review of the literature. 1915 Apr 14

Hereditary cancer predisposition syndromes have been model diseases in order to understand carcinogenesis in many different organs such as colon, breast, ovaries, stomach and others. Better understanding and follow up of these diseases have led to the increasing acceptance of cancer genetic testing and the improving survival of young patients with cancer. Once the mutation is identified in the gene, patients and their relatives have the option of preimplantation genetic diagnosis (PGD) in order to select embryos without familial cancer-predisposing mutations. This procedure has already been performed in several syndromes, including the common syndromes of genetic predisposition to colon and breast cancer. Despite the numerous ethical objections and legal arguments, PGD for adult-onset cancers is today a reality and couples with an inherited predisposing mutation deserve the same respect, support and right to choose if their child will be born having an extremely high risk for cancer development as in the case of other life-threatening diseases for which prenatal screening has become a standard.
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PMID:Hereditary cancer predisposition syndromes and preimplantation genetic diagnosis: where are we now? 1978 65

The NBN (NBS1) gene belongs to a group of double-strand break repair genes. Mutations in any of these genes cause genome instability syndromes and contribute to carcinogenesis. NBN gene mutations cause increased tumor risk in Nijmegen breakage syndrome (NBS) homozygotes as well as in NBN heterozygotes. NBS patients develop different types of malignancies; among solid tumors, medulloblastoma (MB), an embryonal tumor of the cerebellum, has been reported most frequently. The majority of medulloblastomas occur sporadically, some of them manifest within familial cancer syndromes. Several signaling pathways are known to be engaged in hereditary and sporadic MB. The aim of our study was to identify mutations in selected exons of the NBN gene and to determine the frequency of the most common NBN gene mutations in pediatric patients with different types of medulloblastoma. We screened a total of 104 patients with MB and identified 7 heterozygous carriers (6.7%) of two different germ-line mutations of NBN gene; all of them had classic MB. Our results indicate that heterozygous carriers of the germ-line NBN gene mutations (c.511A>G and c.657_661del5) may exhibit increased susceptibility to developing MB. The risk of medulloblastoma is estimated to be 3.0 (for c.511A>G) and 4.86 (for c.657_661del5) times higher than in the general Polish population (p<0.05). These results suggest that heterozygous NBN germ-line mutations may contribute to the etiology of medulloblastoma.
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PMID:Heterozygous germ-line mutations in the NBN gene predispose to medulloblastoma in pediatric patients. 1990 51

The majority of tumors of the nervous system are sporadic. However, a subset of patients with tumors and their families are predisposed to developing cancers of the central nervous system and other organs because of a germline mutation. In the last decade, many of the genes responsible for these typically autosomal dominant familial tumor syndromes have been identified. Additionally, our understanding of the mechanisms of carcinogenesis in these syndromes has increased, allowing for more targeted therapies for these patients as well as those with sporadic cancers. Because these patients present a unique set of issues regarding diagnosis and neurooncological management, the most common familial cancer syndromes involving the nervous system are reviewed: neurofibromatosis type 1 and 2; tuberous sclerosis complex; von Hippel Lindau, Li-Fraumeni, Gorlin, and Turcot syndrome.
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PMID:Neurooncology of familial cancer syndromes. 1995 45

The secondary development of malignant tumors after the treatment of Hodgkin's disease has been termed the price of success, but is relevant also to other types of cancer and gives an opportunity to study mechanisms of carcinogenesis and tumor induction. The authors review here their experience with second malignant neoplasms (SMN) as well as the result of an extensive search of the recent literature. The primary malignancies discussed in this article include Hodgkin's disease, pediatric cancer, breast cancer, lung cancer and other types of tumors. The international literature was searched (Medline 1989-1995) for reports of SMN with special emphasis on risk factors and the molecular mechanisms of tumor induction. In Hodgkin's disease, a 3 to 5-fold elevated risk for SMN was recognized, with a 15-year cumulative incidence in the range of 11-18%. All types of malignancies have a statistically increased risk (leukemias, non-Hodgkin's lymphomas, solid tumors). The risk for leukemia is related to the intensity of treatment with alkylating agents. Some solid tumors like lung cancer or breast cancer are related to radiation therapy. Present-day treatments may carry a lower risk of inducing secondary malignancies than treatments in the past. For non-Hodgkin's lymphoma as primary malignancy, fewer data exist on SMN. In pediatric cancer, no general risk estimate can be given and the genetic influence is greater as a cause of SMN. The improved prognosis for acute lymphoblastic leukemia has led to a changing pattern of pediatric SMN. In head and neck- and in lung cancer, the same etiologic factors which cause the primary tumor may also cause SMN. SMN occur as part of familial cancer syndromes. Two types of treatment related leukemias (mostly AMLs) exist and can be recognized by cytogenetic and molecular analysis. A complete follow-up is necessary to fully appreciate the risk of second malignancy. The goal to prevent SMN must be reached without decreasing the cure rates of the primary tumor. New treatment approaches need to be carefully monitored for SMN. Improved tests of mutagenesis and molecular screening may help to recognize patients prone to develop SMN and permit to estimate certain types of risk. Screening and prevention strategies are useful in high-risk situations.
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PMID:Second malignancies. 2154 81

Adrenocortical carcinoma (ACC) is recognized to be a component tumor of the Li Fraumeni Syndrome (LFS), a familial cancer predisposition resulting from germline mutations in the p53 tumor-suppressor. p53 activity is tightly regulated by multiple post-translational mechanisms, disruption of which may lead to tumorigenesis. ACC is present in disproportionately high rates among p53-mutation carriers, suggesting tissue-specific manifestations of p53 deficiency. Additionally, p53-associated ACC demonstrates a strong predominance in infants and children. Several of the p53 alleles associated with pediatric ACC, however, retain significant wild-type activity and demonstrate incomplete penetrance, a finding distinct from other LFS-component tumors. In this review, we discuss the relationship between p53 and adrenocortical carcinogenesis, with specific focus on disease-specific alleles, tumorigenesis in the context of adrenal development and potential therapeutic approaches to p53-associated ACC.
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PMID:Towards an understanding of the role of p53 in adrenocortical carcinogenesis. 2193 Jan 87

Biallelic inactivation of cancer susceptibility gene BRCA1 leads to breast and ovarian carcinogenesis. Paradoxically, BRCA1 deficiency in mice results in early embryonic lethality, and similarly, lack of BRCA1 in human cells is thought to result in cellular lethality in view of BRCA1's essential function. To survive homozygous BRCA1 inactivation during tumorigenesis, precancerous cells must accumulate additional genetic alterations, such as p53 mutations, but this requirement for an extra genetic "hit" contradicts the two-hit theory for the accelerated carcinogenesis associated with familial cancer syndromes. Here, we show that heterozygous BRCA1 inactivation results in genomic instability in nontumorigenic human breast epithelial cells in vitro and in vivo. Using somatic cell gene targeting, we demonstrated that a heterozygous BRCA1 185delAG mutation confers impaired homology-mediated DNA repair and hypersensitivity to genotoxic stress. Heterozygous mutant BRCA1 cell clones also showed a higher degree of gene copy number loss and loss of heterozygosity in SNP array analyses. In BRCA1 heterozygous clones and nontumorigenic breast epithelial tissues from BRCA mutation carriers, FISH revealed elevated genomic instability when compared with their respective controls. Thus, BRCA1 haploinsufficiency may accelerate hereditary breast carcinogenesis by facilitating additional genetic alterations.
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PMID:Mutation of a single allele of the cancer susceptibility gene BRCA1 leads to genomic instability in human breast epithelial cells. 2237 16

This review of the molecular and cellular changes in the different pathways of colorectal carcinogenesis sets out the classic adenoma-carcinoma sequence of the large bowel as a stepwise series of pathologic neoplastic changes associated with accumulation of genetic and epigenetic molecular alterations. The 2 major types of genomic instability found in colorectal cancers are chromosomal instability (CIN) and microsatellite instability (MSI). CIN is often associated with mutated APC. MSI is due to defective DNA mismatch repair. The associated familial cancer susceptibility syndromes are familial adenomatous polyposis coli, due to inherited APC mutations, and Lynch Syndrome or hereditary nonpolyposis colorectal cancer syndrome, due to inherited mutations in one of the mismatch repair genes (predominantly MLH1 and MSH2). In the CpG island methylator phenotype, a number of genes become transcriptionally silenced because of hypermethylation of their promoters, and this represents a key epigenetic mechanism of inactivation of tumor suppressor genes, including certain DNA repair genes. An overview of the contributions of CIN, MSI, and CpG island methylator phenotype to the different pathways of colorectal carcinogenesis allows categorization of colorectal cancers into 5 major groups on the basis of their molecular and pathologic characteristics.
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PMID:Pathways of colorectal carcinogenesis. 2341 71


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