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PubMed2006

Adjuvant therapy of renal cell carcinoma.

Metastatic renal cell carcinoma (RCC) has a highly variable natural history and carries a dismal prognosis. Unlike many other tumors, RCC is generally unresponsive to cytotoxic, hormonal, and radiation adjuvant therapies after cytoreductive surgery. Different modalities of treatment have been tried and tested with modest success. Until recently, only immunotherapies such as interleukin-2 and interferon-alpha have been shown to provide a response, albeit in a minority of patients and often with severe treatment-associated toxicities. Other adjuvant therapies, such as active specific immunotherapy with Bacillus Calmette-Guerin and autologous renal tumor cell vaccines, have not provided alternative solutions. Recent approaches include heat-shock protein peptide complex 96 vaccine and cG250 monoclonal antibody therapy. Novel targeted therapies have been developed using our knowledge of the molecular genetics that belie RCC. This culminated in sorafenib and sunitinib, the first Food and Drug Administration-approved drugs for RCC in more than a decade in the United States. The future will see further trials being carried out in the development of targeted therapies with emphasis placed on patient selection. Staging systems will need to be updated to integrate molecular biomarkers, which could potentially act not just as diagnostic and prognostic predictors, but also as tools for appropriate patient selection for treatment. In the future, this could potentially lead us to our ultimate goal of personalized medicine.

Antineoplastic Agents↗
PubMed2004

Integrating basic science and clinical research in bladder cancer: update from the first bladder Specialized Program of Research Excellence (SPORE).

PURPOSE OF REVIEW: To review the progress of the genitourinary SPORE (Specialized Program of Research Excellence) in bladder cancer. RECENT FINDINGS: The optimal management of bladder cancer depends on the accurate assessment of the biological potential of the disease. Methotrexate, vincristine, adriamycin and cisplatin (M-VAC) chemotherapy has been the standard of therapy for over a decade. However, there has been no improvement in patient survival. Encouraging preclinical data have resulted in the rapid translation of epidermal growth factor receptor antagonists into the clinic. However, phase I and II single-agent clinical trials in head and neck, lung, and colon cancer failed to match the hope generated by laboratory investigations since only a minority of patients seemed to benefit from this approach. Nonetheless, recent data revealed that non-small-cell lung cancer tumors that responded to single-agent Iressa possessed activating epidermal growth factor receptor mutations. These findings have generated refound interest for epidermal growth factor receptor-dependent tumors that are identified by molecular and pharmacodynamic approaches prior to or early in the course of therapy. SUMMARY: Targeted therapy against epidermal growth factor receptor has become one of the primary focuses of the genitourinary SPORE in bladder cancer. The SPORE grant scheme is designed to encourage rapid development of new and innovative cancer research in areas of high priority, in this case bladder cancer. The SPORE has facilitated the advancement of novel epidermal growth factor receptor-targeted therapy, such as the monoclonal antibody IMC-225 and the tyrosine kinase inhibitor ZD1839 (Iressa), from the laboratory to clinical trials. The integration of these new biological agents in combination with chemotherapy, in order to abrogate the progression of advanced bladder cancer, is the prime directive of our current phase II Iressa/docetaxel trial.

Animals↗
PubMed1999

Single-chain antibodies in pancreatic cancer.

Pancreatic cancer is a therapeutic challenge for surgical and medical oncology. Development of specific molecular tracers for the diagnosis and treatment of this lethal cancer has been one of our major goals. Monoclonal antibodies (MAbs) have been successfully used as selective carriers for delivering radionuclides, toxins or cytotoxic drugs to malignant cell populations; therefore, monoclonal antibody technology has led to a significant amount of research into optimizing targeted therapy. This targeted therapy results in the selective concentration of cytotoxic agents or radionuclides in tumors and should lessen the toxicity to normal tissues, which would normally limit the dosage and effectiveness of systemically administered drugs. The MAb CC49 reacts with a unique disaccharide, Sialyl-Tn, present on tumor-associated mucin (TAG-72) expressed by a majority of human adenocarcinomas. The unique Sialyl-Tn epitope has provided a potential target for immunotherapy of cancer. A single chain Fv (scFv) recombinant protein from CC49 MAb was prepared by engineering the DNA fragments for coding heavy-chain and light-chain variable regions with an appropriate oligonucleotide linker. scFv molecules, when compared to intact MAbs and the more conventional enzymatically derived F(ab')2 and Fab' fragments, offer several advantages as carriers for the selective delivery of radionuclides to tumors. The divalent antibody fragments (sc(Fv)2 or (scFv)2) display an affinity constant similar to that of the intact CC49 IgG and are stable with storage, and after radiolabeling. In preclinical studies, both the covalent and the non-covalent dimeric scFvs exhibit excellent tumor targeting properties with characteristics similar to those of the monomer, e.g., the rapid blood clearance, low kidney uptake and small size suitable for rapid penetration through tumor tissue. Increased tumor targeting of the dimers are probably due to their increased functional affinity attributable to valency, coupled with their higher molecular weight and fewer interactions with normal organs. These properties make these constructs superior to monovalent CC49 scFv. The relatively high tumor uptake, the in vitro and in vivo targeting specificity, and the stability in storage demonstrated by the dimeric CC49 sc(Fv)2 makes it a promising delivery vehicle for therapeutic applications in pancreatic cancer.

Adenocarcinoma↗
PubMed2003

Targeting the epidermal growth factor receptor in non-small cell lung cancer.

Fifteen% or fewer of patients with non-small cell lung cancer (NSCLC) survive 5 years. The current standard of care for patients with locally advanced or metastatic NSCLC is systemic chemotherapy with a two-drug combination regimen that includes a platinum agent. Although systemic chemotherapy reduces the rate of death attributable to lung cancer, disease progression is inevitable and dose-limiting toxicities restrict their use. New molecularly targeted therapies aim to inhibit specific pathways and key molecules implicated in tumor growth and progression while sparing normal cells. Several therapies, which target signal transduction pathways involved in angiogenesis, metastasis, and apoptosis, are in clinical development to treat lung cancer. Among these targeted therapies are the oral, small-molecule epidermal growth factor receptor-tyrosine kinase (EGFR-TK) inhibitors gefitinib and erlotinib. Both therapies have been validated preclinically as new treatment approaches for NSCLC and have shown single-agent activity against advanced, chemorefractory NSCLC in clinical trials. This article focuses on the biology of the EGFR-TK signal transduction pathway, its role in the proliferation of solid tumors, and the rationale for the clinical development of EGFR-TK inhibitors. We also review clinical trials with EGFR-TK inhibitors in NSCLC and future directions of investigation with these targeted agents.

Antineoplastic Agents↗
PubMed2006

Targeted gene therapy toward astrocytoma using a Cre/loxP-based adenovirus system.

The aim of this study was to establish a novel adenovirus-based gene therapy system targeting astrocytoma. For this purpose, the Cre recombinase (Cre)/loxP system together with the astrocytoma-specific promoter for GFAP were used. We constructed an adenovirus (Ad) vector that expressed Cre under the control of the GFAP promoter (AxGFAPNCre), as well as another Ad vector containing a switching unit. The latter vector contained a stuffer sequence encoding GFP (AxCALGLTK) with a functional polyadenylation signal between two loxP sites, followed by the herpes simplex virus thymidine kinase (HSV-TK) gene under the control of the CAG promoter. In this system, gene expression of either the stuffer sequence (GFP) or the downstream gene (HSV-TK) was switched on by co-expression of Cre recombinase. Western blot analysis demonstrated specific expression of high levels of TK protein in C6 glioma cells after co-infection of AxGFAPNCre and AxCALGLTK. In vivo, AxGFAPNCre/AxCALGLTK injection into C6 gliomas in the subcutaneous tissue of nude mice followed by intraperitoneal ganciclovir (GCV) treatment significantly suppressed tumor growth compared with control mice. Co-infection of AxGFAPNCre and AxCALNLLacZ resulted in LacZ expression in C6 glioma cells and some reactive astrocytes, whereas GFP was expressed in other cell types surrounding the injected site. Furthermore, a combination of AxGFAPNCre/AxCALGLTK and intraperitoneal GCV injection significantly regressed intracranial C6 gliomas in the rat striatum and prolonged the survival time compared with control rats. The present results indicate that this cell-type-specific gene therapy using a Cre/loxP adenovirus system is both operational and effective, at least against astrocytoma.

Adenoviridae↗
PubMed2006

The management of serous papillary uterine cancer.

PURPOSE OF REVIEW: Uterine papillary serous cancer is an extremely aggressive cancer, the optimum management of which is still being determined. It is important to understand advances that have been made in 2005 regarding the molecular biology, diagnosis, and management of this deadly disease. RECENT FINDINGS: The main themes in the literature regarding uterine papillary serous cancer are that a potential precursor lesion, serous endometrial intraepithelial carcinoma, has been recognized as an early form of the disease. A variety of molecular biologically important markers have now been identified, including p53, HER2/neu, IL-6, kallikrein 6, and claudin-4, some of which may be susceptible to molecularly targeted therapy. Systematic surgical staging is necessary before additional therapy is recommended. Stage I uterine papillary serous cancer requires aggressive treatment, including surgery, chemotherapy, and radiation therapy for successful treatment. The most effective management of advanced stage disease remains to be resolved. SUMMARY: Serous endometrial intraepithelial carcinoma should be treated as a form of uterine papillary serous cancer. Multimodality therapy is required for the successful management of early stage uterine papillary serous cancer. Advanced disease is often unresponsive to conventional therapy. Molecularly targeted therapies are now being introduced into the management of this disease.

Biomarkers, Tumor↗
PubMed2004

The molecular basis of leukemia.

Major strides have been made in our understanding of the molecular basis of adult and pediatric leukemias. More than one hundred disease alleles have been identified and characterized in cell culture and murine models of leukemia. In some instances, molecularly targeted therapies have been developed based on these insights that are currently in clinical trials, such as small molecule inhibitors of FLT3. In addition, it has recently been appreciated that, as with normal hematopoiesis, there is a hierarchical organization among leukemic cells that includes a rare population of leukemic stem cells that have properties of self-renewal. Understanding the characteristics of these leukemic stem cells may provide new insights into leukemia therapies that target self-renewal pathways. In Section I, Dr. Craig Jordan reviews the data that supports the existence of a "leukemia stem cell." He provides an overview of the functional properties of leukemic stem cells, their relationship to hematopoietic stem cells, and the relevance of leukemic stem cells in other human malignancies including solid tumors. He briefly discusses what is known of the pathways that regulate properties of self-renewal. Dr. Gary Gilliland provides an overview of the genetics of adult leukemias in Section II and ongoing genome-wide strategies for discovery of new disease alleles. He describes the clinical and therapeutic implications of these findings and provides examples of bench-to-bedside translation of molecularly targeted therapies for AML, including the use of FLT3 inhibitors. In Section III, Dr. Carolyn Felix reviews recent advances in our understanding of the genetics and therapy of pediatric leukemias. She provides an overview of leukemias that are common in pediatric malignancies but rarely observed in adults, including the TEL-AML1 (ETV6-RUNX1) fusion associated with pediatric B-cell ALL, the OTT-MAL fusion associated with infant megakaryoblastic leukemia, PTPN11 mutations in juvenile myelomonocytic leukemia, and MLL fusion genes in leukemogenesis, among others.

Adult↗
PubMed2005

Targeted antitumour therapy--future perspectives.

The advent of targeted therapy presents an unprecedented opportunity for advances in the treatment of cancer. A key challenge will be to translate the undoubted promise of targeted agents into tangible clinical benefits. Achieving this goal is likely to be dependent upon a number of factors. These include continued research to improve our understanding of the heterogeneity and complexity of the tumour microenvironment; refinement of clinical trial design to incorporate nontraditional end points such as the optimum biological dose and health-related quality of life; and the use of technological advancements in proteomics, genomics and biomarker development to better predict tumour types and patient subsets that may be particularly responsive to treatment, as well as enable a more accurate assessment of drug effect at the molecular level. In summary, the future success of targeted agents will require an integrated multidisciplinary approach involving all stakeholders.

Antibodies, Monoclonal↗
PubMedDate not supplied

Targeted ultrasonic contrast agents for molecular imaging and therapy.

Targeted contrast agents are expanding the detectability and diagnosis of pathology from a strict anatomic to biochemical basis. Moreover, these new agents, in their various forms, offer the potential for site-specific drug and gene delivery, ie, the "magic bullet" first postulated by Paul Erhlich 100 years ago. The ability to direct drugs to the molecular signatures of disease, to confirm noninvasively their presence at the site-of-interest, and to quantify the adequacy of local drug concentration at the time of treatment, ie, rational targeted drug delivery, offers exciting new clinical paradigms in the near future.

Animals↗
PubMed2003

Targeted ultrasonic contrast agents for molecular imaging and therapy.

Targeted contrast agents are expanding the detectability and diagnosis of pathology from a strict anatomic to biochemical basis. Moreover, these new agents, in their various forms, offer the potential for site-specific drug and gene delivery, i.e., the "magic bullet" first postulated by Paul Erhlich 100 years ago. The ability to direct drugs to the molecular signatures of disease, to confirm noninvasively their presence at the site-of-interest, and to quantify the adequacy of local drug concentration at the time of treatment, ie, rational targeted drug delivery, offers exciting new clinical paradigms in the near future.

Antibodies, Monoclonal↗
PubMed2001

[177Lu-DOTA(0),Tyr3] octreotate for somatostatin receptor-targeted radionuclide therapy.

Receptor-targeted scintigraphy using radiolabeled somatostatin analogs such as octreotate is being used with great success to demonstrate the in vivo presence of somatostatin receptors on various tumors. A new and promising application for these analogs is radionuclide therapy. Radionuclides suitable for this application include the Auger electron-emitter (111)In and the beta-emitters (90)Y (high energy) and (177)Lu (low energy). We investigated [DOTA(0),Tyr(3)]octreotate, labeled with the lanthanide (177)Lu, in biodistribution and radionuclide therapy experiments using male Lewis rats bearing the somatostatin receptor-positive rat CA20948 pancreatic tumor. Biodistribution studies in Lewis rats showed the highest uptake in the rat pancreatic CA20948 tumor and sst(2)-positive organs, which include the adrenals, pituitary and pancreas, of [(177)Lu-DOTA(0),Tyr(3)]octreotate in comparison with (88)Y- and (111)In-labeled analogs. Kidney uptake of [(177)Lu-DOTA(0),Tyr(3)]octreotate could be reduced by approximately 40% by co-injection of 400 mg/kg D-lysine. In radionuclide therapy studies, a 100% cure rate was achieved in the groups of rats bearing small (< or =1 cm(2)) CA20948 tumors after 2 doses of 277.5 MBq or after a single dose of 555 MBq [(177)Lu-DOTA(0),Tyr(3)]octreotate. A cure rate of 75% was achieved after a single administration of 277.5 MBq. In rats bearing larger (> or =1 cm(2)) tumors, 40% and 50% cure rates were achieved in the groups that received 1 or 2 277.5 MBq injections of [(177)Lu-DOTA(0),Tyr(3)]octreotate, respectively. After therapy with [(177)Lu-DOTA(0),Tyr(3)]octreotide in rats bearing small tumors, these data were 40% cure after 1 injection with 277.5 MBq and 60% cure after 2 repeated injections. In conclusion, [(177)Lu-DOTA(0),Tyr(3)]octreotate has demonstrated excellent results in radionuclide therapy studies in rats, especially in animals bearing smaller tumors. This candidate molecule shows great promise for radionuclide therapy in patients with sst(2)-expressing tumors.

Animals↗
PubMed1998

The prospects of hepatic drug delivery and gene therapy.

Liver targeted therapy is designed to deliver a substance preferentially to the organ in order to increase the accumulation, improve the therapeutic effect and reduce toxicity to other organs. The aim of selective targeting is to deliver a substance to a specific cell type in the liver. A variety of vehicles have been designed and further modified for selective targeting of therapeutics to the liver. The targeting properties and strategies of commonly used agents, such as liposomes, microspheres and recombinant chylomicrons, are discussed. Viral and non-viral vectors, such as cationic liposomes, reconstituted chylomicron remnants, adenoviruses, adeno-associated viruses, retroviruses, and SV-40, are currently being evaluated for the delivery of DNA to the liver. New developments in improving the targeting efficiency of the available vectors while avoiding their disadvantages have made their use in clinical trials of various genetic disorders possible. For viral hepatitis, antisense and ribozyme techniques are being employed with selective targeting approaches. A commonly employed current strategy for targeting hepatocellular carcinoma cells is to make the tumour cells convert non-toxic 'prodrugs' to toxic metabolites in situ, achieving a high concentration of the toxic product in the local milieu, while avoiding systemic toxicity. Although gene therapy itself is in its infancy, some encouraging results have been developed in studies of familial hypercholesterolaemia, haemophilia, alpha1-antitrypsin deficiency and Crigler-Najjar syndrome. The potential strengths as well as the problems with these studies are discussed.

Journal Article↗
PubMed2005

Theory, targets and therapy in systemic lupus erythematosus.

The treatment of systemic lupus erythematosus (SLE) has been refined over the years, with the recognition that a fine balance lies between aggressive and prompt therapy and attendant complications brought upon by immunosuppressive therapy itself. However, there has been limited change to the repertoire of drugs available to treat this challenging disease. The current standard therapy for severe manifestations of SLE includes the use of high-dose corticosteroids and cytotoxic agents such as cyclophosphamide (CYC), which have been associated with an increased risk of serious and opportunistic infections. The need for safer, more targeted therapies has been recognized and now, with the exponential increase in the understanding of immunopathogenic mechanisms in SLE, the way has been paved for the development of biologic or targeted therapies in SLE. Although the potential immunosuppression, long-term safety issues and cost-effectiveness remain unclear. These targeted therapies may range from small molecules that specifically inhibit inflammatory processes at an intracellular, cell-cell or cell-matrix level to monoclonal antibodies, soluble receptors or natural antagonists that interfere with cytokine function, cellular activation and inflammatory gene transcription.

Animals↗
PubMed1999

Genetic prodrug activation therapy for breast cancer: A phase I clinical trial of erbB-2-directed suicide gene expression.

PURPOSE: This trial was designed to test the safety and efficacy of a tumor-specific genetic prodrug activation therapy targeted by use of the human erbB-2 gene promoter. The erbB-2 oncogene is overexpressed in approximately 20% of cases of breast cancer and is associated with poor prognosis. PATIENTS AND METHODS: Twelve breast cancer patients received transcriptionally targeted gene therapy in a phase I clinical trial using direct intratumoral injection of plasmid construct combined with systemic administration of prodrug. The genetic prodrug activation therapy is specifically targeted to erbB-2-overexpressing breast cancer cells by use of a therapeutic cassette that contains the Escherichia coli cytosine deaminase gene driven by the tumor-specific erbB-2 promoter, thus allowing activation of fluorocytosine to the active cytotoxic fluorouracil only within tumor cells that express the oncogene. RESULTS: The approach was shown to be safe and to result in targeted gene expression in up to 90% of cases. Using a number of different assays, we demonstrated that significant levels of expression of the suicide gene were specifically restricted to erbB-2-positive tumor cells, confirming the selectivity of the approach. CONCLUSION: The results of this study, the first targeted gene therapy for breast cancer and the first to use the cytosine deaminase system in human subjects, are encouraging for the development of genetic prodrug activation therapies that exploit the transcriptional profile of cancer cells.

Adult↗
PubMed2005

Imaging after vascular gene therapy.

Targets for cardiovascular gene therapy currently include limiting restenosis after balloon angioplasty and stent placement, inhibiting vein bypass graft intimal hyperplasia/stenosis, therapeutic angiogenesis for cardiac and lower-limb ischemia, and prevention of thrombus formation. While catheter angiography is still standard method to follow-up vascular gene transfer, other modern imaging techniques, especially intravascular ultrasound (IVUS), magnetic resonance (MR), and positron emission tomography (PET) imaging provide complementary information about the therapeutic effect of vascular gene transfer in humans. Although molecular imaging of therapeutic gene expression in the vasculatures is still in its technical development phase, it has already offered basic medical science an extremely useful in vivo evaluation tool for non- or minimally invasive imaging of vascular gene therapy.

Angiography↗
PubMed2005

Construction of recombinant eukaryotic expression plasmid containing murine CD40 ligand gene and its expression in H22 cells.

AIM: To construct a recombinant murine CD40 ligand (mCD40L) eukaryotic expression vector for gene therapy and target therapy of hepatocellular carcinoma (HCC). METHODS: mCD40L cDNA was synthesized by RT-PCR with the specific primers and directly cloned into T vector to generate middle recombinant. After digestion with restriction endonuclease, the target fragment was subcloned into the multi-clone sites of the eukaryotic vector. The constructed vector was verified by enzyme digestion and sequencing, and the product expressed was detected by RT-PCR and immunofluorescence methods. RESULTS: The full-length mCD40L-cDNA was successfully cloned into the eukaryotic vector through electrophoresis, and mCD40L gene was integrated into the genome of infected H22 cells by RT-PCR. Murine CD40L antigen molecule was observed in the plasma of mCD40L-H22 by indirect immunofluorescence staining. CONCLUSION: The recombined mCD40L eukaryotic expression vector can be expressed in H22 cell line. It provides experimental data for gene therapy and target therapy of hepatocellular carcinoma.

Animals↗
PubMed2006

Systemic targeted radionuclide therapy: potential new areas.

Radiation oncology is entering an exciting new era with therapies being delivered in a targeted fashion through an increasing number of novel approaches. External beam radiotherapy now integrates functional and anatomic tumor imaging to guide delivery of conformal radiation to the tumor target. Systemic targeted radionuclide therapy (STaRT) adds an important new dimension by making available to the radiation oncologist biologically targeted radiation therapy. Impressive clinical results with antibody-targeted radiotherapy, leading to the Food and Drug Administration's approval of two anti-CD20 radiolabeled antibodies, highlight the potential of STaRT. Optimization strategies will further improve the efficacy of STaRT by improving delivery systems, modifying the tumor microenvironment to increase targeted dose, and maximizing dose effect. Ultimately, the greatest potential for STaRT will not be as monotherapy, but as therapy integrated into established multimodality regimens and used as adjuvant or consolidative therapy in patients with minimal or micrometastatic disease.

Antibodies, Bispecific↗
PubMed2005

Emerging drug targets for antiretroviral therapy.

Current targets for antiretroviral therapy (ART) include the viral enzymes reverse transcriptase and protease. The use of a combination of inhibitors targeting these enzymes can reduce viral load for a prolonged period and delay disease progression. However, complications of ART, including the emergence of viruses resistant to current drugs, are driving the development of new antiretroviral agents targeting not only the reverse transcriptase and protease enzymes but novel targets as well. Indeed, enfuvirtide, an inhibitor targeting the viral envelope protein (Env) was recently approved for use in combination therapy in individuals not responding to current antiretroviral regimens. Emerging drug targets for ART include: (i) inhibitors that directly or indirectly target Env; (ii) the HIV enzyme integrase; and (iii) inhibitors of maturation that target the substrate of the protease enzyme. Env mediates entry of HIV into target cells via a multistep process that presents three distinct targets for inhibition by viral and cellular-specific agents. First, attachment of virions to the cell surface via nonspecific interactions and CD4 binding can be blocked by inhibitors that include cyanovirin-N, cyclotriazadisulfonamide analogues, PRO 2000, TNX 355 and PRO 542. In addition, BMS 806 can block CD4-induced conformational changes. Secondly, Env interactions with the co-receptor molecules can be targeted by CCR5 antagonists including SCH-D, maraviroc (UK 427857) and aplaviroc (GW 873140), and the CXCR4 antagonist AMD 070. Thirdly, fusion of viral and cellular membranes can be inhibited by peptides such as enfuvirtide and tifuvirtide (T 1249). The development of entry inhibitors has been rapid, with an increasing number entering clinical trials. Moreover, some entry inhibitors are also being evaluated as candidate microbicides to prevent mucosal transmission of HIV. The integrase enzyme facilitates the integration of viral DNA into the host cell genome. The uniqueness and specificity of this reaction makes integrase an attractive drug target. However, integrase inhibitors have been slow to reach clinical development, although recent contenders, including L 870810, show promise. Inhibitors that target viral maturation via a unique mode of action, such as PA 457, also have potential. In addition, recent advances in our understanding of cellular pathways involved in the life cycle of HIV have also identified novel targets that may have potential for future antiretroviral intervention, including interactions between the cellular proteins APOBEC3G and TSG101, and the viral proteins Vif and p6, respectively. In summary, a number of antiretroviral agents in development make HIV entry, integration and maturation emerging drug targets. A multifaceted approach to ART, using combinations of inhibitors that target different steps of the viral life cycle, has the best potential for long-term control of HIV infection. Furthermore, the development of microbicides targeting HIV holds promise for reducing HIV transmission events.

APOBEC Deaminases↗