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Query: UMLS:C0677930 (primary tumor)
 20,210 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Nine patients with osteosarcoma were treated by chemotherapy combined with caffeine and surgery. All primary tumors showed complete histological response to preoperative chemotherapy consisting of three intraarterial infusions of cisplatin and caffeine without/with doxorubicin and two systemic high-dose methotrexate combined with vincristine. Limb-salvage surgery was performed in eight patients with marginal procedure, which led to the preservation of good limb function. Below-knee amputation was done in one patient with calcaneal osteosarcoma. There has been neither local recurrence nor lung metastasis in seven patients with conventional osteosarcoma during a median follow-up period of 28 months. Lung metastases leading to death were observed in one patient with small-cell osteosarcoma despite complete destruction of the primary tumor by preoperative chemotherapy. Chemotherapy combined with caffeine administration deserves further extensive and large-scale study in osteosarcoma.
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PMID:Effect of chemotherapy combined with caffeine for osteosarcoma. 151 77

Cancer is a dynamic process that involves many complex factors, which may explain why a "magic bullet" cure for cancer has not been found. Death rates are still rising for many types of cancers, which possibly contributes to the increased interest in chemoprevention as an alternative approach to the control of cancer. This strategy for cancer control is based on the presumption that because cancer develops through a multi-step process, each step may be a prospective target for reversing or suppressing the process. Thus, the design and development of chemopreventive agents that act on specific and/or multiple molecular and cellular targets is gaining support as a rational approach to control cancer. Nutritional or dietary factors have attracted a great deal of interest because of their perceived ability to act as highly effective chemopreventive agents. They are professed as being generally safe and may have efficacy as chemopreventive agents by preventing or reversing premalignant lesions and/or reducing second primary tumor incidence. Many of these dietary compounds appear to act on multiple target signaling pathways. Some of the most interesting and well documented are resveratrol and components of tea, including EGCG, theaflavins and caffeine. This review will focus on recent work regarding three well-accepted cellular/molecular mechanisms that may at least partially explain the effectiveness of selected food factors, including those indicated above, as chemopreventive anti-promotion agents. These food compounds may act by: (1) inducing apoptosis in cancer cells; (2) inhibiting neoplastic transformation through the inhibition of AP-1 and/or NF-kappaB activation; and/or (3) suppressing COX-2 overexpression in cancer cells.
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PMID:Targeting signal transduction pathways by chemopreventive agents. 1547 50

A significant fraction of cancer patients have occult disseminated tumors at the time of primary diagnosis, which usually progress to become clinically relevant lesions. Since the majority of cancer mortality is associated with metastatic disease, the ability to inhibit the growth of the secondary tumors would significantly reduce cancer-related morbidity and mortality. We have investigated whether caffeine, which has been shown to suppress tumor cell invasiveness and experimental metastasis, can suppress metastasis in a spontaneous transgene-induced mammary tumor model. Chronic exposure to caffeine prior to the appearance of palpable mammary tumors significantly reduced both tumor burden and metastatic colonization. However, when caffeine exposure began after the appearance of frank tumors, caffeine suppressed metastasis without changing primary tumor burden. The means by which caffeine suppressed metastatic activity may be associated with inhibition of malignant transformation of mammary epithelial cells, inhibition of conversion of dormant tumor cells to micrometastases, micrometastases to macrometastases, or inhibition of tumor cell adhesion and motility. Gene and protein expression patterns resulting from caffeine treatment showed that metastasis suppression may be associated with up-regulation the mRNA expression of multiple extracellular matrix genes, including Fbln1, Bgn, Sparc, Fbn1, Loxl1, Colla1, Col3a1, Col5a1, ColS5a2, ColSa3, Col6a1, Col6a2, and Col6a3. These data suggested that caffeine or other methyl xanthine derivatives may improve the clinical outcome in patients prior to and following the diagnosis of metastatic disease, and could potentially reduce the morbidity and mortality associated with disseminated tumors.
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PMID:Caffeine suppresses metastasis in a transgenic mouse model: a prototype molecule for prophylaxis of metastasis. 1603 17

In primary bone sarcomas, the efficacy of chemotherapy varies according to the histological types. Prognoses are poor in patients with osteosarcoma or Ewing's sarcoma, when surgery alone is performed. However, because these sarcomas are chemosensitive, their prognoses have been improved with adjuvant chemotherapy. Nowadays, in highgrade bone sarcomas, especially in osteosarcoma, Ewing.s sarcoma and malignant fibrous histiocytoma of bone, adjuvant chemotherapy including neoadjuvant or preoperative chemotherapy is usually performed. The purpose of the neoadjuvant chemotherapy is (I) to prevent distant metastases, (II) to reduce the size of the primary tumor and (III) to evaluate the efficacy of the chemotherapeutic agents. Reducing the tumor size facilitates easier excision with less risk of local recurrence. In addition, not only limb-saving but also function-preserving surgery is made possible. Evaluating the efficacy of the chemotherapeutic agents in preoperative chemotherapy facilitates rational selection of postoperative chemotherapeutic agents. Several kinds of anticancer agents are used, and many authors have reported various kinds of protocols and their clinical results. Commonly used drugs include adriamycin, ifosfamide, cisplatin, methotrexate and vincristine in osteosarcoma, and vincristine, adriamycin, cyclophosphamide, ifosfamide, actinomycin-D and etoposide in Ewing's sarcoma. In contrast, chondrosarcomas are chemoresistant, and chemotherapy is rarely performed. Low-grade bone sarcomas, e. g., parosteal osteosarcoma, central low-grade osteosarcoma, are well cured only by surgical excision, and adjuvant chemotherapy is not performed for these low-grade sarcomas. To enhance the efficacy of preoperative chemotherapy, various modalities have been used e. g., intraarterial infusion, caffeine-assisted chemotherapy, and local perfusion with hyperthermia. Good clinical results have been reported.
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PMID:[Preoperative adjuvant therapy for primary malignant bone tumors]. 1803 9