bluuebunny/crossref_metadata_2025_split huggingface dataset:
De novoInduction of a Cancer/Testis Antigen by 5-Aza-2′-Deoxycytidine Augments Adoptive Immunotherapy in a Murine Tumor Model
Authors: Guo Z. Sheng , Hong Julie A. , Irvine Kari R. , Chen G. Aaron , Spiess Paul J. , Liu Yang , Zeng Gang , Wunderlich John R. , Nguyen Dao M. , Restifo Nicholas P. , Schrump David S. 
Published: January 2006

AbstractRecent studies suggest that immunotherapy targeting specific tumor-associated antigens (TAAs) may be beneficial in cancer patients. However, most of these TAAs are tumor type specific and heterogeneous among patients, thus limiting their applications. Here, we describe the de novo induction of a cancer/testis antigen (CTA) for immunotherapy of tumors of various histologies. The murine CTA P1A, normally expressed only in a few tumor lines, could be induced de novo in all P1A-negative cancer lines of eight histologic origins in vitro and in various murine xenografts by systemic administration of 5-aza-2′-deoxycytidine. The induction of P1A expression correlated strongly with demethylation of the CpG island in the promoter region of this gene. The induced antigen was processed and presented properly for recognition by H-2Ld-restricted P1A-specific CTLs. The combination of a demethylating agent and adoptive transfer of P1A-specific CTL effectively treated lung metastases in syngeneic mice challenged with P1A-negative 4T1 mammary carcinoma cells. These data show a novel strategy of combined chemoimmunotherapy of cancer targeting a CTA induced de novo in a broad range of tumor histologies, and support further evaluation of chromatin-remodeling agents for human cancer therapy. (Cancer Res 2006; 66(2): 1105-13)
Identification of a Putative Tumor Suppressor Gene Rap1GAP in Pancreatic Cancer
Authors: Zhang Lizhi , Chenwei Li , Mahmood Redah , Golen Kenneth van , Greenson Joel , Li Gangyong , D'Silva Nisha J. , Li Xiangquan , Burant Charles F. , Logsdon Craig D. , Simeone Diane M. 
Published: January 2006

Abstract
Human chromosome 1p35-p36 has long been suspected to harbor a tumor suppressor gene in pancreatic cancer and other tumors. We found that expression of rap1GAP, a gene located in this chromosomal region, is significantly down-regulated in pancreatic cancer. Only a small percentage of preneoplastic pancreatic intraductal neoplasia lesions lost rap1GAP expression, whereas loss of rap1GAP expression occurred in 60% of invasive pancreatic cancers, suggesting that rap1GAP contributes to pancreatic cancer progression. In vitro and in vivo studies showed that loss of rap1GAP promotes pancreatic cancer growth, survival, and invasion, and may function through modulation of integrin activity. Furthermore, we showed a high frequency of loss of heterozygosity of rap1GAP in pancreatic cancer. Collectively, our data identify rap1GAP as a putative tumor suppressor gene in pancreatic cancer. (Cancer Res 2006; 66(2): 898-906)
Age-Related Changes of the Cervix Influence Human Papillomavirus Type Distribution
Authors: Castle Philip E. , Jeronimo Jose , Schiffman Mark , Herrero Rolando , Rodríguez Ana C. , Bratti M. Concepción , Hildesheim Allan , Wacholder Sholom , Long L. Rodney , Neve Leif , Pfeiffer Ruth , Burk Robert D. 
Published: January 2006

Abstract
Approximately 15 human papillomavirus (HPV) types cause virtually all cervical cancer whereas other HPV types are unrelated to cancer. We were interested in whether some noncarcinogenic types differ from carcinogenic in their affinity for the cervical transformation zone, where nearly all HPV-induced cancers occur. To examine this possibility, we tested cervical specimens from 8,374 women without cervical precancer and cancer participating in a population-based study in Guanacaste for &gt;40 HPV types using PCR. We compared age-group specific prevalences of HPV types of the α9 species, which are mainly carcinogenic and include HPV16, to the genetically distinct types of the α3/α15 species (e.g., HPV71), which are noncarcinogenic and common in vaginal specimens from hysterectomized women. We related HPV detection of each group to the location of the junction between the squamous epithelium of the ectocervix and vagina and the columnar epithelium of the endocervical canal. Models evaluated the independent effects of amount of exposed columnar epithelium (ectopy) and age on the presence of α9 or α3/α15 types. Prevalence of α9 types (7.6%) peaked in the youngest women, declined in middle-aged women, and then increased slightly in older women. By contrast, prevalence of α3/α15 types (7.6%) tended to remain invariant or to increase with increasing age. Detection of α9 infections increased (Ptrend &lt; 0.0005) but α3/α15 infections decreased (Ptrend &lt; 0.0005) with increasing exposure of the columnar epithelia. Older age and decreasing cervical ectopy were independently positively associated with having an α3/α15 infection compared with having an α9 infection. These patterns need to be confirmed in other studies and populations. We suggest that these genetically distinct groups of HPV types may differ in tissue preferences, which may contribute to their differences in carcinogenic potential. (Cancer Res 2006; 66(2): 1218-24)
The Penetration of Anticancer Drugs through Tumor Tissue as a Function of Cellular Adhesion and Packing Density of Tumor Cells
Authors: Grantab Rama , Sivananthan Shankar , Tannock Ian F. 
Published: January 2006

AbstractTo reach cancer cells in optimal quantities, therapeutic agents must be delivered to tumors through their imperfect blood vascular system, cross vessel walls into the interstitium, and penetrate multiple layers of tissue. Strategies to enhance drug penetration have potential to improve therapeutic outcome. The development of multicellular layers (MCLs), in which tumor cells are grown on a semipermeable Teflon support membrane, has facilitated quantification of drug penetration through solid tissue. The goals of the present study were to quantify the penetration of anticancer drugs as a function of cellular adhesion and packing density and to determine the effects of variable penetration on therapeutic efficacy in this model system. We compared the properties of MCLs grown from two epithelioid and round subclones of a colon carcinoma cell line. One pair of epithelioid and round sublines differed in expression of α-E-catenin, and both pairs generated MCLs with different packing density. The penetration of commonly used anticancer agents (paclitaxel, doxorubicin, methotrexate, and 5-fluorouracil) through MCLs derived from these cell lines was significantly greater through the round (loosely packed) than through the epithelioid (tightly packed) sublines. In MCLs treated with doxorubicin, we observed greater survival in the tightly packed cell lines than in the loosely packed cell lines. Impaired penetration of anticancer agents through MCLs derived from the tightly packed cell lines and relative resistance to killing of cells within them by doxorubicin treatment strengthen the role of tumor cell adhesion and packing density as contributing to drug resistance. (Cancer Res 2006; 66(2): 1033-9)
The Single Nucleotide Polymorphism IVS1+309 in Mouse Double Minute 2 Does Not Affect Risk of Familial Breast Cancer
Authors: Wilkening Stefan , Bermejo Justo Lorenzo , Burwinkel Barbara , Klaes Rüdiger , Bartram Claus R. , Meindl Alfons , Bugert Peter , Schmutzler Rita K. , Wappenschmidt Barbara , Untch Michael , Hemminki Kari , Försti Asta 
Published: January 2006

Abstract
The mouse double minute 2 (MDM2) oncoprotein promotes cell survival and cell cycle progression by inhibiting the p53 tumor suppressor protein. Further, MDM2 overexpression can inhibit DNA double-strand break repair in a p53-independent manner. Recently, it was shown that a single nucleotide polymorphism (SNP) in the MDM2 promoter was associated with an accelerated tumor formation in individuals with a p53 mutation. The present case-control study investigated the association of this SNP (IVS1+309) with the risk and the age of onset of familial breast cancer in patients with unknown p53 mutation status. Data from 549 women affected by familial breast cancer and 1,065 healthy controls were analyzed. The cases did not carry BRCA1/2 mutations. Cases and controls showed a similar genotype distribution and the SNP did not seem to modify the age of onset of familial breast cancer. The data were also examined taking into account the presence of any additional cancer after breast cancer and the family history of cases; however, no association was found. These results suggest that the SNP IVS1+309 alone affects neither the risk nor the age of onset of heritable breast cancer. (Cancer Res 2006; 66(2): 646-8)
Farnesyl and Geranylgeranyl Transferase Inhibitors Induce G1 Arrest by Targeting the Proteasome
Authors: Efuet Ekem T. , Keyomarsi Khandan 
Published: January 2006

Abstract
Isoprenoid inhibitors are being evaluated as agents for the treatment of cancer. Their antitumor activity is attributed to inhibition of post-translational modification of Ras, which is crucial for its translocation and attachment to the plasma membrane, and ultimate involvement in signal transduction. However, whether blocking of Ras is solely responsible for the observed antitumor activity is unresolved. In this report, we propose an alternate mechanism. Using breast tumor models, we show that agents possessing a lactone moiety, including statins (such as lovastatin) and the isoprenoid inhibitors (such as FTI-277 and GGTI-298), mediate their cell cycle inhibitory activities by blocking the chymotrypsin activity of the proteasome in vitro. This results in the accumulation of cyclin-dependent kinase inhibitors p21 and p27 with subsequent G1 arrest. Cells devoid of p21 were refractory to the growth-inhibitory activity of lovastatin, FTI-277, and GGTI-298. However, in these p21 null cells, isoprenylation of key substrates of farnesyl transferase (such as Ras) and of geranylgeranyl transferase (such as RAP-1) were inhibited by FTI-277 and GGTI-298, respectively, suggesting that although both these isoprenoid inhibitors reached and inhibited their intended targets, inhibition of the isoprenylation of Ras and RAP-1A are not sufficient to mediate G1 arrest. We also show that the cell cycle effects can be attributed to the functional lactone moiety of the aforementioned agents. Collectively, our data suggest that FTI and GGTI and other agents containing an active lactone moiety mediate G1 arrest via inhibition of the proteasome and up-regulation of p21, independent of the inhibition of isoprenylation of Ras or RAP-1. (Cancer Res 2006; 66(2): 1040-51)
Distinct Role of Macrophages in Different Tumor Microenvironments
Authors: Lewis Claire E. , Pollard Jeffrey W. 
Published: January 2006

AbstractMacrophages are prominent in the stromal compartment of virtually all types of malignancy. These highly versatile cells respond to the presence of stimuli in different parts of tumors with the release of a distinct repertoire of growth factors, cytokines, chemokines, and enzymes that regulate tumor growth, angiogenesis, invasion, and/or metastasis. The distinct microenvironments where tumor-associated macrophages (TAM) act include areas of invasion where TAMs promote cancer cell motility, stromal and perivascular areas where TAMs promote metastasis, and avascular and perinecrotic areas where hypoxic TAMs stimulate angiogenesis. This review will discuss the evidence for differential regulation of TAMs in these microenvironments and provide an overview of current attempts to target or use TAMs for therapeutic purposes. (Cancer Res 2006; 66(2): 605-12)
Gene Conversion Is a Frequent Mechanism of Inactivation of the Wild-Type Allele in Cancers from MLH1/MSH2 Deletion Carriers
Authors: Zhang Jian , Lindroos Annette , Ollila Saara , Russell Anna , Marra Giancarlo , Mueller Hansjakob , Peltomaki Paivi , Plasilova Martina , Heinimann Karl 
Published: January 2006

Abstract
Hereditary nonpolyposis colorectal cancer (HNPCC) is an autosomal dominantly inherited cancer predisposition syndrome caused by germ line mutations in DNA mismatch repair genes, predominantly MLH1 and MSH2, with large genomic rearrangements accounting for 5% to 20% of all mutations. Although crucial to the understanding of cancer initiation, little is known about the second, somatic hit in HNPCC tumorigenesis, commonly referred to as loss of heterozygosity. Here, we applied a recently developed method, multiplex ligation–dependent probe amplification, to study MLH1/MSH2 copy number changes in 16 unrelated Swiss HNPCC patients, whose cancers displayed microsatellite instability and loss of MLH1 or MSH2 expression, but in whom no germ line mutation could be detected by conventional screening. The aims of the study were (a) to determine the proportion of large genomic rearrangements among Swiss MLH1/MSH2 mutation carriers and (b) to investigate the frequency and nature of loss of heterozygosity as a second, somatic event, in tumors from MLH1/MSH2 germ line deletion carriers. Large genomic deletions were found to account for 4.3% and 10.7% of MLH1 and MSH2 mutations, respectively. Multiplex ligation–dependent probe amplification analysis of 18 cancer specimens from two independent sets of Swiss and Finnish MLH1/MSH2 deletion carriers revealed that somatic mutations identical to the ones in the germ line occur frequently in colorectal cancers (6 of 11; 55%) and are also present in extracolonic HNPCC-associated tumors. Chromosome-specific marker analysis implies that loss of the wild-type allele predominantly occurs through locus-restricted recombinational events, i.e., gene conversion, rather than mitotic recombination or deletion of the respective gene locus. (Cancer Res 2006; (66)2: 659-64)
Ductal Access for Prevention and Therapy of Mammary Tumors
Authors: Murata Satoshi , Kominsky Scott L. , Vali Mustafa , Zhang Zhe , Garrett-Mayer Elizabeth , Korz Dorian , Huso David , Baker Sharyn D. , Barber James , Jaffee Elizabeth , Reilly R. Todd , Sukumar Saraswati 
Published: January 2006

Abstract
In cancer patients and in those at high risk, systemic exposure to agents for therapy or prevention is accompanied by undesirable side effects. We hypothesized that it is possible to prevent and treat breast cancer by introducing anticancer agents into the mammary ductal network. Here, we show the efficacy of intraductally administered anticancer agents 4-hydroxytamoxifen and pegylated liposomal doxorubicin (PLD) in the prevention and treatment of breast cancer using the rat N-methyl-N′-nitrosourea–induced and spontaneous HER-2/neu transgenic mouse (neu-N) models of breast cancer. Intraductal administration of PLD to neu-N mice caused regression of established tumors and prevented tumor development more effectively than i.v. injection (P &lt; 0.0001). Intraductal administration resulted in lower circulating levels of PLD compared with i.v. administration, with no evidence of systemic toxicity or long-term histopathologic changes in the mammary gland. Compared with systemic administration, intraductal injection provides direct access to breast lesions with higher local and lower systemic drug exposure. These studies suggest that this approach has potential for application to prevention and neoadjuvant therapy of early breast cancer. (Cancer Res 2006; 66(2): 638-45)
Developmental haemostasis
Authors: Barnes Chris , Ignjatovic Vera , Furmedge Janine , Newall Fiona , Chan Anthony , De Rosa Lidia , Hamilton Simone , Ragg Philip , Robinson Stephen , Auldist Alex , Crock Cathy , Roy Neil , Rowlands Shelley , Monagle Paul 
Published: January 2006

SummaryDevelopmental haemostasis is a concept, now universally accepted, introduced by Andrew et al. in the late 1980’s. However, coagulation analysers and reagents have changed significantly over the past 15 years. Coagulation testing is known to be sensitive to changes in individual reagents and analysers. We hypothesised that the reference ranges developed by Andrew et al. may not be appropriate for use in a modern coagulation laboratory. Our study was designed to determine whethera current day coagulation testing system (STA Compact analyser and Diagnostica Stago reagent system) was sensitive to agerelated changes in coagulation assays. This is the first large scale study since Andrew et al. to determine the age associated numerical changes in coagulation proteins. Our results confirm the concepts of developmental haemostasis elucidated by Andrew et al. However, our results clearly demonstrate that the absolute values of reference ranges for coagulation assays in neonates and children vary with analyser and reagent systems. The results confirm the need for coagulation laboratories to develop age-related reference ranges specific to their own testing systems. Without this, accurate diagnosis and management of neonates and children with suspected bleeding or clotting disorders is not possible. Finally we present age related reference ranges for D-dimers, TFPI, and endogenous thrombin potential, previously not described.
Evaluation of haemostatic molecular markers for diagnosis of disseminated intravascular coagulation in patients with infections
Authors: Asakura Hidesaku , Okamoto Kohji , Iba Toshiaki , Uchiyama Toshimasa , Eguchi Yutaka , Kawasugi Kazuo , Koga Shin , Mayumi Toshihiko , Koike Kaoru , Gando Satoshi , Wada Hideo 
Published: January 2006

SummaryEarly treatment of disseminated intravascular coagulation (DIC) is recommended but global coagulation tests used in authorized DIC criteria are not sensitive for diagnosis of early-phase DIC. We examined the plasma levels of thrombin-antithrombin complex (TAT), plasmin-plasmin inhibitor complex (PPIC) and D-dimer in patients with suspected DIC to determine the cutoff values for diagnosis of DIC. Plasma levels of D-dimer, TAT and PPIC were significantly elevated in patients with DIC and correlated with DIC score. The cutoff values were determined using the receiver operative curve analysis. The cutoff value represented the point at which the sensitivity curve crossed the specificity curve. The cutoff values of D-dimer, TAT and PPIC for DIC were 12. 0 µg/ml, 11.0 ng/ml and 1.8 µg/ml, respectively. These values were moderately to highly sensitive for the diagnosis of DIC but not for poor outcome. The combination of D-dimer, TAT and PPIC showed high sensitivity and low specificity when one or more tests were positive, but showed low sensitivity and high specificity when all three tests were positive. We conclude that hemostatic molecular markers might be useful for the diagnosis of DIC and should be confirmed by several trials.
Polymorphisms of COX-1 and GP VI associate with the antiplatelet effect of aspirin in coronary artery disease patients
Authors: Mikkelsson Jussi , Reséndiz Julio , Viiri Leena , Backman Janne , Kankuri Esko , Karhunen Pekka , Lassila Riitta , Lepäntalo Aino 
Published: January 2006

SummaryThe antiplatelet effect of aspirin varies individually. This study evaluated whether the antiplatelet effect of aspirin associates with polymorphisms in the genes coding for cyclo-oxygenase-1 (COX-1) and several platelet glycoprotein (GP) receptors in patients with stable coronary artery disease (CAD). Blood samples were collected from 101 aspirin-treated (mean 100 mg/d) patients. Compliance to treatment was assessed by plasma salicylate measurement. Platelet functions were assessed by two methods: 1) Response to arachidonic acid (AA, 1.5 mmol/L in aggregometry, and 2) PFA-100, evaluating platelet activation under high shear stress in the presence of collagen and epinephrine (CEPI). Aspirin non-response was defined as: 1) slope steeper than 12%/min in AA-aggregations,and 2) by closure time shorter than 170 s in PFA-100. The methods used detected different individuals as being aspirin non-responders. Five and 21 patients, respectively, were non-responders according to AA-induced aggregation and PFA-100. Increased plasma thromboxane B2 levels correlated with poor aspirin-response measured with both AA-induced aggregations and PFA-100 (P=0.02 and P=0.003, respectively). Of the non-responders detected by AA, 3 of5 (60%) carried the rareG allele for the -A842G polymorphism of COX-1 in contrast to 16 of 96 (17%) responders (P=0.016). Diabetes was associated with poor response. Aspirin non-response detected by PFA-100 associated with C13254T polymorphism of GP VI and female gender (P=0.012 and P=0.019, respectively). Although two patients were possibly non-compliant, this did not effect present conclusions. Evaluation of aspirin efficacy by AA-induced aggregation and PFA-100 detected different individuals, with different genotypic profiles, as being aspirin non-responders.
Modulation of protease nexin-1 activity by polysaccharides
Authors: Bouton Marie-Christine , Loyau Stéphane , Lavigne Damien , Letourneur Didier , Jandrot-Perrus Martine , Arocas Véronique , Richard Benjamin 
Published: January 2006

SummaryProtease nexin-1 (PN-1) is a non-circulating pericellular serpin expressed by vascular cells. PN-1 inhibits different proteases but when associated with glycosaminoglycans, its activity is mainly directed towards thrombin. Fucoidans are sulphated polysaccharides which can interact with several serpins and have antithrombotic and anticoagulant properties in vivo with a lower hemorrhagic risk than heparin. The purpose of this study was to compare the effects of low (LMW) or high molecular weight (HMW) fucoidans to those of standard heparin and LMW heparin on PN-1 properties. Using surface-enhanced laser desorption/ionization time-of-flight mass spectrometry (SELDI-TOF MS) and affinity coelectrophoresis, we observed that polysaccharides bound to thrombin, PN-1 and the thrombin/PN-1 complex. Progress curve kinetics showed that LMW and HMW fucoidans accelerate thrombin inhibition by PN-1 (111 and 402 fold, respectively) whereas the acceleration by LMW heparin and standard heparin was only of 36– and of 307-fold, respectively. Moreover, the formation of PN-1/125I-thrombin complex was increased in the presence of heparin, HMW and LMW fucoidans, but barely by LMW heparin. The dose response followeda bell shape curve, again suggesting the formation of ternary complexes between thrombin, PN-1 and polysaccharides. We also investigated the ability of polysaccharides to remove PN-1 bound to the cell membrane of smooth muscle cells in culture. PN-1 was detached by fucoidans and heparins and was still able to inhibit thrombin. In conclusion, fucoidans reduce cell-associated PN-1 and thrombin/PN-1 complexes and increase the antithrombin activity of PN-1. The capacity of PN-1 to regulate the pericellular activity of thrombin amongst other proteases reinforces the therapeutical interest of fucoidans.