Search results for "Imatinib Mesylate"
showing 10 items of 68 documents
Oral Chemotherapy for the Older Patient with Cancer
2002
Oral chemotherapy presents a number of theoretical advantages in older cancer patients, including convenience of administration and dosage flexibility. Of the oral fluorinated pyrimidines, capecitabine is the most promising, because it minimizes the exposure of normal tissue to the active drug and substantially reduces the risk of mucositis, that is particularly common and severe in the aged. Despite promising initial results, oral etoposide does not offer any special advantage over the intravenous formulation for older patients, while oral temozolomide may have a role in the palliation of malignant melanoma and primary and secondary brain tumors. Of the experimental agents, oral platinum (…
Prognostic significance of circulating PD-1, PD-L1, pan-BTN3As and BTN3A1 in patients with metastatic gastrointestinal stromal tumours (mGISTs)
2019
Abstract Background Gastrointestinal stromal tumours (GISTs) account for 1% of all primary gastrointestinal cancers. In cancer, suppressive immune checkpoints, including butyrophilin sub-family 3A/CD277 receptors (BTN3A), programmed death protein (PD-1) and its ligand PD-L1, are often hyper-activated to ensure an effective evasion of tumor cells from immune surveillance. Since recent studies showed that PD-1 and PD-L1 expression in cancer may be an important prognostic factor, the aim of our study was to investigate if soluble forms of inhibitory immune checkpoints can help predict survival in metastatic GIST patients. Methods Using specific homemade ELISA assays not yet commercially availa…
Phase I/II trial of capecitabine and oxaliplatin in combination with bevacizumab and imatinib in patients with metastatic colorectal cancer: AIO KRK …
2013
Background: Combined inhibition of platelet-derived growth factor receptor beta signalling and vascular endothelial growth factor promotes vascular normalisation in preclinical models and may lead to increased delivery of chemotherapy to tumour tissue. This phase I/II trial assessed the safety and efficacy of capecitabine plus oxaliplatin (XELOX) plus bevacizumab and imatinib in the first-line treatment of patients with metastatic colorectal cancer. Methods: Two dose levels (I/II) were defined: capecitabine 850/1000 mg m−2 twice daily on days 1–14; oxaliplatin 100/130 mg m−2 on day 1; bevacizumab 7.5 mg kg−1 on day 1; imatinib 300 mg day−1 on days 1–21 every 21 days. The primary study endpo…
Gastrointestinal stromal tumors (GISTs): Focus on histopathological diagnosis and biomolecular features
2007
Gastrointestinal stromal tumors (GISTs) are mesenchymal tumors of the gastrointestinal tract that are believed to originate from a neoplastic transformation of the intestinal pacemaker cells (interstitial cells of Cajal) normally found in the bowel wall or their precursors. Although the microscopic features have been known for a long time, the defining characteristic of GIST is the presence of the cell-surface antigen CD117 (KIT), which is demonstrated by immunohistochemistry. KIT, which is a growth factor transmembrane receptor, is the product of the proto-oncogene c-kit (chromosome 4). Surgical removal remains the only curative treatment for patients with GISTs. Tumor size, mitotic index,…
Dermatofibrosarcoma protuberans: a comprehensive review and update on diagnosis and management
2013
Dermatofibrosarcoma protuberans (DFSP) is a rare superficial tumor characterized by high rates of local recurrence and low risk of metastasis. DFSP occurs most commonly on the trunk and proximal extremities, affects all races, and often develops between the second and fifth decade of life. The tumor grows slowly, typically over years. Histologically, several variants of DFSP have been described and should be well characterized to avoid misdiagnosis with other tumors. These include pigmented (Bednar tumor), myxoid, myoid, granular cell, sclerotic, atrophic DFSP, giant cell fibroblastoma, and DFSP with fibrosarcomatous areas. Of all these variants, only the DFSP with fibrosarcomatous areas is…
Effects of carboxyamidotriazole on in vitro models of imatinib-resistant chronic myeloid leukemia.
2008
Although imatinib mesylate (IM) has revolutionized the treatment of chronic myeloid leukemia (CML), some patients develop resistance with progression of leukemia. Alternative or additional targeting of signaling pathways deregulated in bcr-abl-driven CML cells may provide a feasible option for improving clinical response and overcoming resistance. In this study, we show that carboxyamidotriazole (CAI), an orally bioavailable calcium influx and signal transduction inhibitor, is equally effective in inhibiting the proliferation and bcr-abl dependent- and independent-signaling pathways in imatinib-resistant CML cells. CAI inhibits phosphorylation of cellular proteins including STAT5 and CrkL a…
Pterostilbene and 3′-hydroxypterostilbene are effective apoptosis-inducing agents in MDR and BCR-ABL-expressing leukemia cells
2005
Pterostilbene and 3,5-hydroxypterostilbene are the natural 3,5-dimethoxy analogs of trans-resveratrol and piceatannol, two compounds which can induce apoptosis in tumor cells. In previous studies we demonstrated the importance of a 3,5-dimethoxy motif in conferring pro-apoptotic activity to stilbene based compounds so we now wanted to evaluate the ability of pterostilbene and 3,5-hydroxypterostilbene in inducing apoptosis in sensitive and resistant leukemia cells. When tested in sensitive cell lines, HL60 and HUT78, 3'-hydroxypterostilbene was 50-97 times more potent than trans-resveratrol in inducing apoptosis, while pterostilbene appeared barely active. However, both compounds, but not tr…
[Clinical guidelines for the management of gastrointestinal stromal tumors]
2006
Treatment of gastrointestinal stromal tumors (GIST) has been revolutioned by the recently discovered molecular mechanism responsible for the oncogenesis of this disease. In addition, due to the rapid progress at molecular and clinical level observed in the last few years, there is a need to review the current state of the art in order to delineate appropriate guidelines for the optimal management of these tumors. A panel of experts from several specialities, including medical oncology, surgery, pathology, molecular biology and imaging, were invited to participate in a meeting to present and discuss a number of pre-selected questions, and to achieve a consensus according to the categories of…
Adjuvant Imatinib in Patients with GIST Harboring Exon 9 KIT Mutations : Results from a Multi-institutional European Retrospective Study
2022
[Purpose] The effect of high-dose imatinib (800 mg/day) on survival in the adjuvant treatment of patients with resected KIT exon 9–mutated gastrointestinal stromal tumors (GIST) is not established. Here, the association of dose and other clinicopathologic variables with survival was evaluated in a large multi-institutional European cohort.
Show me your signaling– and I’ll tell you who you are
2009
See Article, pages 725–733Cancer research and therapy have come a long way:the field started out in search of a ‘‘magic bullet” accord-ing to Paul Ehrlich’s theory, and was hoping to identifya target which was pivotal to signaling survival in trans-formed cells. Indeed, certain diseases with monocausalmutations were identified, and targeting of the muta-tional products has helped in the design of treatmentstrategies. In chronic myeloid leukemia (CML), the con-stitutive activation of the tyrosine kinase BCR-ABL ispathognomonic [1], and multiple BCR-ABL kinaseinhibitors (e.g. imatinib mesylate, dasatinib, nilotinib)have been developed and successfully used in the treat-ment of CML offering near-…