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Suppression of glomerulosclerosis by adenovirus-mediated IL-10 expression in the kidney.

Glomerulosclerosis is a common morphologic result seen in almost all progressed renal diseases, and is the characteristic change in focal segmental glomerulosclerosis (FSGS). The most convincing hypothesis for glomerulosclerosis is cytokine-mediated injury by infiltrating immune cells in the glomerulus and tubulointerstitial area. This study investigated whether the anti-inflammatory effect of interleukin-10 (IL-10) when expressed by a recombinant adenoviral vector can prevent the onset of glomerulosclerosis in FGS/Kist mice (an animal model with naturally occurring renal failure initiated by FSGS). Each group of mice received recombinant adenoviruses encoding human IL-10 (Ad:hIL-10) by intraparenchymal injection at 6 weeks and were examined for cytokine expression, glomerular sclerotic index, and proteinuria. After injection of Ad:hIL-10 to the kidney, IL-10 expression was found to last over 20 days. Mice treated with Ad:hIL-10 were shown to have a significant reduction in the glomerular sclerotic index at 10 weeks when compared to control groups. The level of proteinuria in Ad:hIL-10-treated mice was also significantly reduced. About 50% of the urine samples of naive and Ad:LacZ-treated groups had severe levels of proteinuria. By contrast, at 10 weeks the group treated with Ad:hIL-10 had lower levels of proteinuria and transforming growth factor-beta1 (TGF-beta1) expression. These results demonstrate that IL-10 effectively prevents the development of glomerulosclerosis in FGS/Kist mice, and IL-10 gene therapy may be of use for the treatment of renal failure.

Adenoviridae↗

Complexities in ETS-domain transcription factor function and regulation: lessons from the TCF (ternary complex factor) subfamily. The Colworth Medal Lecture.

The ETS-domain transcription factor family can be divided into a series of subfamilies. Elk-1 represents the founding member of the ternary complex factor (TCF) subfamily. By focusing on the TCF subfamily, we can demonstrate the complexities that exist in the function and regulation of ETS-domain transcription factors. This article focuses on Elk-1 in detail and summarizes the functions of other TCFs. The key themes covered include the domain structure of the TCFs, the mechanisms of complex formation with serum response factor, regulation of TCFs by mitogen-activated protein kinase cascades, and transcriptional regulatory properties of the TCFs. Finally, the emerging role of the TCFs in vivo is discussed. A picture is developing indicating that, while these proteins exhibit significant sequence and functional conservation, key differences in their structure and regulation are being identified which may relate to unique functions of these proteins in vivo.

Amino Acid Sequence↗

Effects of octreotide treatment on early TNF-alpha production and localization in experimental chronic colitis.

BACKGROUND: Colitis induced by trinitrobenzene sulphonic acid (TNB) is a model of Th1 disease, mainly explored from the third day of induction. It has recently been shown that octreotide and other somatostatin analogues can modify inflammatory/immune processes by acting on cytokines. AIM: To examine TNFalpha production and the effect of preventive treatment with octreotide, during the early phase of TNB-colitis. METHODS: Thirty milligrams TNB with 50% ethanol was instilled into the colon of male Wistar rats. Treated groups received octreotide (2x10 microg x day/rat) or dexamethasone (1x2 mg x day/kg), subcutaneously, with the first injection before TNB. Eight and 80 h later, the colon was excised and processed for histology, TNFalpha immunohistochemistry, quantification of cytokine release ex vivo and tissue-inducible NO synthase (iNOS) activity. RESULTS: Maximal TNFalpha production was observed at the 8th hour, associated with intense immunostaining of the external muscle layer. Octreotide treatment decreased TNFalpha expression (staining and activity) and iNOS activity. At the 80th hour, submucosal macrophages were positive for TNFalpha and colonic production of IL1beta and interferon gamma was increased; all these effects were reduced by octreotide treatment. CONCLUSIONS: TNFalpha was expressed early by resident muscle cells, before staining of infiltrated immune cells and increased production of interferon gamma. TNFalpha regulation by octreotide suggests that this drug might exert anti-inflammatory properties via smooth muscle cells.

4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinone↗

Helicobacter pylori inhibits phagocytosis by professional phagocytes involving type IV secretion components.

Gastric infections by Helicobacter pylori are characteristically associated with an intense inflammation and infiltration of mainly polymorphonuclear lymphocytes (PMNs) and monocytes. The inflammatory response by infiltrated immune cells appears to be a primary cause of the damage to surface epithelial layers and may eventually result in gastritis, peptic ulcer, gastric cancer and/or MALT-associated gastric lymphoma. Our analysis of the interaction between H. pylori and PMNs and monocytes revealed that H. pylori inhibits its own uptake by these professional phagocytes. To some degree, this effect resembles antiphagocytosis by Yersinia enterocolitica. Increasing numbers of bacteria associated per cell are more efficient at blocking their own engulfment. In H. pylori, bacterial protein synthesis is necessary to block phagocytic uptake, as shown by the time and concentration dependence of the bacteriostatic protein synthesis inhibitor chloramphenicol. Furthermore, H. pylori appears broadly to inhibit the phagocytic function of monocytes and PMNs, as infection with H. pylori abrogates the phagocytes' ability to engulf latex beads or adherent Neisseria gonorrhoeae cells. This antiphagocytic phenotype depends on distinct virulence (vir) genes, such as virB7 and virB11, encoding core components of a putative type IV secretion apparatus. Our data indicate that H. pylori exhibits an antiphagocytic activity that may play an essential role in the immune escape of this persistent pathogen.

Bacterial Adhesion↗

[Myocarditis in childhood: results of a decade's research].

The research of the last decade gave new insights in the pathogenesis of viral myocarditis. The virus infection of the myocardium may be controlled by the infiltrating inflammatory cells and heal with more or less scarring. An autoimmune mediated chronic inflammation is observed as well as the persistence of virus genoms, which causes with low replication rate again chronic inflammation. The immunohistochemical characterization of the infiltrating immune cells and the molecular biological proof of virus genoms in endomyocardial specimens allow a sensitive diagnostic of the various forms of myocarditis and should guide therapy. Until now treatment trials did not differentiate between these various forms, had no control groups or very small numbers of patients. Two multicenter treatment trials in Germany referring to immunosuppressive or interferon therapy in children and adults may give--provided a better participation--recommendations for therapy.

Adrenal Cortex Hormones↗

Molecular heterogeneity in acute renal allograft rejection identified by DNA microarray profiling.

BACKGROUND: The causes and clinical course of acute rejection vary, and it is not possible to predict graft outcome reliably on the basis of available clinical, pathological, and genetic markers. We hypothesized that previously unrecognized molecular heterogeneity might underlie some of the variability in the clinical course of acute renal allograft rejection and in its response to treatment. METHODS: We used DNA microarrays in a systematic study of gene-expression patterns in biopsy samples from normal and dysfunctional renal allografts. A combination of exploratory and supervised bioinformatic methods was used to analyze these profiles. RESULTS: We found consistent differences among the gene-expression patterns associated with acute rejection, nephrotoxic effects of drugs, chronic allograft nephropathy, and normal kidneys. The gene-expression patterns associated with acute rejection suggested at least three possible distinct subtypes of acute rejection that, although indistinguishable by light microscopy, were marked by differences in immune activation and cellular proliferation. Since the gene-expression patterns pointed to substantial variation in the composition of immune infiltrates, we used immunohistochemical staining to define these subtypes further. This analysis revealed a striking association between dense CD20+ B-cell infiltrates and both clinical glucocorticoid resistance (P=0.01) and graft loss (P<0.001). CONCLUSIONS: Systematic analysis of gene-expression patterns provides a window on the biology and pathogenesis of renal allograft rejection. Biopsy samples from patients with acute rejection that are indistinguishable on conventional histologic analysis reveal extensive differences in gene expression, which are associated with differences in immunologic and cellular features and clinical course. The presence of dense clusters of B cells in a biopsy sample was strongly associated with severe graft rejection, suggesting a pivotal role of infiltrating B cells in acute rejection.

Acute Disease↗

Predicting survival in patients with metastatic kidney cancer by gene-expression profiling in the primary tumor.

To identify potential molecular determinants of tumor biology and possible clinical outcomes, global gene-expression patterns were analyzed in the primary tumors of patients with metastatic renal cell cancer by using cDNA microarrays. We used grossly dissected tumor masses that included tumor, blood vessels, connective tissue, and infiltrating immune cells to obtain a gene-expression "profile" from each primary tumor. Two patterns of gene expression were found within this uniformly staged patient population, which correlated with a significant difference in overall survival between the two patient groups. Subsets of genes most significantly associated with survival were defined, and vascular cell adhesion molecule-1 (VCAM-1) was the gene most predictive for survival. Therefore, despite the complex biological nature of metastatic cancer, basic clinical behavior as defined by survival may be determined by the gene-expression patterns expressed within the compilation of primary gross tumor cells. We conclude that survival in patients with metastatic renal cell cancer can be correlated with the expression of various genes based solely on the expression profile in the primary kidney tumor.

Adult↗

Effects of cytokines on matrix metalloproteinase expression in oral squamous cell carcinoma in vitro.

CONCLUSIONS: The intra-tumoral cytokines IL-6, hepatocyte growth factor (HGF) and tumour necrosis factor-a (TNF-a) stimulate oral cancer cells to enhanced secretion of matrix metalloproteinase (MMP)-1 and -9. These results contribute to an understanding of the extracellular events necessary for tumour progression. OBJECTIVE: MMPs play an important role in enhanced intra-tumoral proteolytic activity, promoting angiogenesis and invasion by acting on extracellular matrix substances. Cytokines secreted by tumour-infiltrating immune cells, fibroblasts and tumour cells can modulate MMP expression and secretion by cancer cells. The objective of this study was to investigate the effects of IL-6, soluble IL-6 receptor (sIL-6R), HGF, TNF-a and IL-8 on MMP-1, -2 and -9 expression by two oral squamous cell carcinoma cell lines (UT-SCC-20A and -24A). MATERIAL AND METHODS: ELISA was used to analyse secretion of total MMP protein and gelatin zymography was used for activity analysis. RESULTS: IL-6 had a moderate stimulatory effect on MMP-1 secretion in both cell lines, whereas sIL-6R had no effect. When these cytokines were added together, a dose-dependent, synergistic stimulatory effect was observed. HGF also upregulated MMP-1 secretion, especially in one cell line (UT-SCC-24A), and a synergistic effect was observed when HGF was added to IL-6 in both cell lines. MMP-9 secretion by UT-SCC-24A was increased when stimulated with HGF and IL-6 combined with sIL-6R, whereas no effect was found in the other cell line. TNF-a stimulated MMP-9 secretion in both cell lines, but only stimulated MMP-1 secretion in one (UT-SCC-24A). The zymographic results were consistent with the ELISA results, indicating an upregulation of active enzyme when a stimulatory effect on protein expression was detected.

Carcinoma, Squamous Cell↗

Development and validation of a novel risk stratification signature derived from migrasome and tumor microenvironment-related genes for molecular subtyping and improving clinical outcomes in head and neck squamous cell carcinoma.

BACKGROUND: The tumor microenvironment (TME) and migrasomes released by tumor cells significantly influence carcinogenesis and immune evasion. However, our understanding of the prognostic and therapeutic implications of migrasome and tumor microenvironment-related genes (mtmRGs) in head and neck squamous cell carcinoma (HNSCC) remains limited. METHODS: We explored the relationship between mtmRGs and HNSCC prognosis by utilizing The Cancer Genome Atlas (TCGA) and the Gene Expression Omnibus (GEO) databases. Subsequently, we developed an innovative prognostic signature, and assessed its prognostic significance using the Kaplan-Meier method, time-dependent receiver operating characteristic (ROC), and Cox regression analyses. To explore the underlying mechanisms, we conducted gene set variation analysis (GSVA), gene set enrichment analysis (GESA), and immune infiltration analysis. A nomogram was developed to estimate the overall survival (OS) rates for HNSCC patients. Lastly, we chose P4HA1, which was part of the signature, for additional experimental validation in vitro and in vivo. RESULTS: The mtmRGs signature effectively classifies HNSCC patients into two distinct risk subgroups, with the high-risk cohort demonstrating significantly poorer OS. The risk score serves as an independent prognostic factor for HNSCC patients; those with lower risk scores are more likely to exhibit favorable responses to immunotherapy, particularly with CTLA4 inhibitors. Furthermore, a lower risk score is significantly correlated with the sensitivity of HNSCC patients to cyclophosphamide, gemcitabine, and axitinib. CONCLUSION: This study presents an innovative gene signature associated with mtmRGs, which may be utilized both for predicting survival and directing personalized chemotherapy and immunotherapy regiments for patients with HNSCC.

Humans↗

More than structural cells, fibroblasts create and orchestrate the tumor microenvironment.

The tumor microenvironment comprises many cell types including infiltrating immune cells such as lymphocytes, endothelial cells and a complex stroma consisting mainly of fibroblasts. Fibroblasts are heterogeneous and consist of Thy-1+ and Thy-1- subsets that define different biosynthetic and differentiation potential. They produce mediators linked to carcinogenesis and metastasis, including Cox-2 and PGE2, both of which are also increased in most cancers. This review will highlight the emerging role of the complex fibroblastic stroma in establishing a microenvironment supporting malignant transformation, tumor growth and attenuation of host anti-tumor immune responses.

Animals↗

Pathophysiological aspects of lymphedema of human limbs: I. Lymph protein composition.

The knowledge of humoral and cellular factors retained in tissues affected by ineffective lymph transport is necessary to comprehend the pathological mechanisms of the evolving changes in the extremity. In this article, we report our observations on changes in the protein composition of lymph in obstructive lymphedema. We have documented that the protein concentrations in lymph tissue fluid of the extremities remain within normal limits in lymphedema of stages I through III. Normal lymph protein values in lymphedema indicate that the homeostatic mechanism of protein transport remains intact as long as there are no major structural changes in the tissues that imply loss of tissue space compliance. A "high protein" edema means "high protein volume" edema that does not affect the Starling's equilibrium. The levels of cytokines were found to be elevated in lymphedema lymph when compared with controls. There were major differences in cytokine levels among patients, evidently higher than those among the control subjects. The high levels of cytokines might be attributed to their local production by infiltrating immune cells. The serum levels remain low, and the lymph-to-serum ratio was above 1 in all the cases investigated. These findings reflect the intensity of the chronic inflammation that prevails in tissues with lymph stasis, not detectable by measuring the levels of lymph immunoglobulins and complement. Moreover, our studies have documented the presence of apoptotic DNA in the lymph of patients with obstructive lymphedema. There were greater quantities of 400-kb apoptotic and smaller DNA fragments in the lymph from lymphedematous limbs than in the controls. The level of fragmented DNA may be another parameter that reflects cellular changes in tissues with lymph stasis. Taken together, measuring levels of lymph proteins provides insight into the evolving processes in the limb tissues.

Apoptosis↗

Involvement of oxidative stress in the pathogenesis of diabetes.

Pancreatic beta-cell failure is the common characteristic of type 1 and type 2 diabetes. Type 1 diabetes is induced by pancreatic beta-cell destruction, which is mediated by an autoimmune mechanism and consequent inflammatory process. Various inflammatory cytokines and oxidative stress produced by islet-infiltrating immune cells have been proposed to play an important role in mediating the destruction of beta cells. The JNK pathway is also activated by such cytokines and oxidative stress and is involved in beta-cell destruction. Type 2 diabetes is the most prevalent and serious metabolic disease affecting people all over the world. Pancreatic beta-cell dysfunction and insulin resistance are the hallmark of type 2 diabetes. Once hyperglycemia becomes apparent, beta-cell function gradually deteriorates, and insulin resistance is aggravated. This process is called "glucose toxicity." Under such conditions, oxidative stress is provoked, and the JNK pathway is activated, which is likely involved in pancreatic beta-cell dysfunction and insulin resistance. In addition, oxidative stress and activation of the JNK pathway are involved in the progression of atherosclerosis, which is often observed under diabetic conditions. Taken together, it is likely that oxidative stress and subsequent activation of the JNK pathway are involved in the pathogenesis of type 1 and type 2 diabetes.

Atherosclerosis↗

Stimulation of calcineurin signaling attenuates the dystrophic pathology in mdx mice.

Utrophin has been studied extensively in recent years in an effort to find a cure for Duchenne muscular dystrophy. In this context, we previously showed that mice expressing enhanced muscle calcineurin activity (CnA*) displayed elevated levels of utrophin around their sarcolemma. In the present study, we therefore crossed CnA* mice with mdx mice to determine the suitability of elevating calcineurin activity in preventing the dystrophic pathology. Muscles from mdx/CnA* displayed increased nuclear localization of NFATc1 and a fiber type shift towards a slower phenotype. Measurements of utrophin levels in mdx/CnA* muscles revealed an approximately 2-fold induction in utrophin expression. Consistent with this induction, we also observed that members of the dystrophin-associated protein (DAP) complex were present at the sarcolemma of mdx/CnA* mouse muscle. This restoration of the utrophin-DAP complex was accompanied by significant reductions in the extent of central nucleation and fiber size variability. Importantly, assessment of myofiber sarcolemmal damage, as monitored by the intracellular presence of IgM and albumin as well as by Evans blue uptake in vivo, revealed a net amelioration of membrane integrity. Finally, immunofluorescence experiments using Mac-1 antibodies showed a reduction in the number of infiltrating immune cells in muscles from mdx/CnA* mice. These results show that elevated calcineurin activity attenuates the dystrophic pathology and thus provides an effective target for pharmacological intervention.

Animals↗

Delayed rejection of porcine cartilage is averted by transgenic expression of alpha1,2-fucosyltransferase.

The use of xenogeneic cells or tissues for tissue engineering applications may lead to advances in biomedical research. Hyperacute and delayed rejection are immunologic hurdles that must be addressed to achieve xenograft survival in the pig-to-primate setting. Expression of human alpha1,2-fucosyltransferase (HT) in the donor cell or tissue protects from hyperacute rejection (HAR) by reducing expression of Galalpha1,3-Gal epitope, the major xenoantigen recognized by human natural antibodies. We hypothesized that Galalpha1,3-Gal antigen contributes to delayed tissue rejection. To test this hypothesis, we transplanted control or HT-transgenic engineered porcine cartilage s.c. into alpha1,3-galactosyltransferase knockout (Gal KO) mice. Control porcine cartilage grafted in Gal KO mice was not susceptible to HAR but was rejected in several wk by a prominent cellular immune infiltrate and elevated antibody titers. In contrast, Gal KO mice receiving the HT engineered cartilage showed a markedly reduced anti-pig antibody response and no anti-Galalpha1,3-Gal-elicited antibody response. The HT implants had a mild cellular infiltrate that was confined to the graft periphery. Our study demonstrates that a marked reduction of Galalpha1,3-Gal antigen in HT-transgenic porcine cartilage confers resistance to a process of delayed rejection. Further development of tissue engineering applications that use genetically modified porcine tissues is encouraged.

Animals↗

Purinoceptor expression in regenerating skeletal muscle in the mdx mouse model of muscular dystrophy and in satellite cell cultures.

ATP is an important extracellular signaling molecule mediating its effects by activation of P2X and P2Y receptors. P2 receptors are expressed during muscle development, and recent findings demonstrate that ATP can regulate myoblast proliferation and differentiation in vitro. However, the role of purinergic signaling during regeneration of injured skeletal muscle has not been investigated. To examine this process in a clinically relevant system, we used the mouse model of muscular dystrophy (mdx), in which muscle degeneration is rapidly followed by regeneration. The latter process, in vivo muscle regeneration, was the focus of this study, and to study the cellular mechanisms involved in it, a parallel study on normal rat skeletal myoblast cultures was conducted. Using immunohistochemistry, RT-PCR, and electrophysiology, we investigated the expression of the P2X1-7 receptor subtypes and the P2Y1,2,4,6 receptors. Experiments in vitro and in vivo demonstrated the sequential expression of the P2X5, P2Y1, and P2X2 receptors during the process of muscle regeneration. The P2X5 and P2Y1 receptors were expressed first on activated satellite cells, and the P2Y1 receptor was also expressed on infiltrating immune cells. Subsequent P2X2 receptor expression on newly formed myotubes showed significant colocalization with AChRs, suggesting a role in regulation of muscle innervation. Thus, this study provides the first evidence for a role for purinergic signaling in muscle regeneration and raises the possibility of new therapeutic strategies in the treatment of muscle disease.

Adenosine Triphosphate↗

Somatostatin receptor scintigraphy with 111In-DOTA-lanreotide and 111In-DOTA-Tyr3-octreotide in patients with stage IV melanoma: in-vitro and in-vivo results.

The overexpression of somatostatin receptors (SST-Rs) on various tumour cells provides the molecular basis for the successful use of radiolabelled SST analogues in clinical oncology. The objective of the study was to evaluate the tumour binding of In-1,4,7,10-tetraazacyclo-dodecane-N,N',N'',N'''-tetraacetic acid-lanreotide (In-DOTA-LAN) and In-DOTA-tyrosine-octreotide (In-DOTA-Tyr-OCT) in patients with stage IV melanoma. In addition, we evaluated the potential antiproliferative effect of SST analogues, together with an assessment of the functionality of SST-Rs, on four melanoma cell lines. Twenty-three patients with advanced metastatic melanoma underwent scintigraphy. Thirty-eight of 61 lesions (62%) were positively imaged with In-DOTA-LAN, whereas 23 (37%) were negative. With In-DOTA-Tyr-OCT, 10 of the 23 documented lesions (43%) were positive and 13 (56%) were negative. In vitro, cell lines showed no growth inhibition in the presence of SST analogues and no influence on cell cycle distribution was found with the addition of SST analogues to cultured cells. In addition, no functional surface SST-Rs could be demonstrated on these cell lines. Taken together, our results demonstrate the visualization of metastatic melanoma in a high percentage of patients, probably due to binding of SST analogues to SST-Rs on tumour vessels or infiltrating immune cells. Judging from our data, however, there is no evidence of functional SST-R expression on melanoma cells.

Adult↗

Molecular and cellular mechanisms in vascular injury in hypertension: role of angiotensin II.

PURPOSE OF REVIEW: Emerging evidence indicates that hypertension is a vascular disease associated with inflammation, induced through redox-sensitive mechanisms that are regulated by angiotensin II. This review focuses on the role of inflammation, oxidative stress and angiotensin II in vascular injury and discusses implications of these processes in hypertension. RECENT FINDINGS: The dogma that hypertension is primarily a consequence of hemodynamic alterations has changed over the recent past, with compelling evidence that high blood pressure is linked to vascular damage, oxidative stress and inflammation. Of the many factors implicated in hypertensive vascular disease, angiotensin II appears to be one of the most important. Angiotensin II, a multifunctional peptide regulating vascular contraction, growth and fibrosis, has recently been identified as proinflammatory mediator. Angiotensin II increases vascular permeability, promotes recruitment of inflammatory cells into tissues, and directly activates infiltrating immune cells, which further contribute to the inflammatory process. Moreover, angiotensin II participates in tissue repair and remodeling, by stimulating cell growth and fibrosis. Many of these processes are mediated through increased generation of reactive oxygen species (oxidative stress). SUMMARY: Inflammation, oxidative stress and hypertension are closely interrelated. Here we discuss the (patho)physiology of vascular inflammation in hypertension, focusing specifically on the role of angiotensin II and reactive oxygen species. By understanding molecular and cellular mechanisms of hypertensive vascular disease will allow for more targeted therapy and hopefully improved management and treatment of patients with hypertension.

Angiotensin II↗

Workshop on cancer biometrics: identifying biomarkers and surrogates of cancer in patients: a meeting held at the Masur Auditorium, National Institutes of Health.

The current excitement about molecular targeted therapies has driven much of the recent dialog in cancer diagnosis and treatment. Particularly in the biologic therapy of cancer, identifiable antigenic T-cell targets restricted by MHC molecules and the related novel stress molecules such as MICA/B and Letal allow a degree of precision previously unknown in cancer therapy. We have previously held workshops on immunologic monitoring and angiogenesis monitoring. This workshop was designed to discuss the state of the art in identification of biomarkers and surrogates of tumor in patients with cancer, with particular emphasis on assays within the blood and tumor. We distinguish this from immunologic monitoring in the sense that it is primarily a measure of the tumor burden as opposed to the immune response to it. Recommendations for intensive investigation and targeted funding to enable such strategies were developed in seven areas: genomic analysis; detection of molecular markers in peripheral blood and lymph node by tumor capture and RT-PCR; serum, plasma, and tumor proteomics; immune polymorphisms; high content screening using flow and imaging cytometry; immunohistochemistry and tissue microarrays; and assessment of immune infiltrate and necrosis in tumors. Concrete recommendations for current application and enabling further development in cancer biometrics are summarized. This will allow a more informed, rapid, and accurate assessment of novel cancer therapies.

Alternative Splicing↗