Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0598934 (tumor growth)
 58,965 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

We investigated the mechanism(s) by which systemic administration of doxorubicin (DXR) produced growth retardation of B16 melanomas in the subcutis of syngeneic mice. DXR or saline was injected intravenously (i.v.) into C57BL/6 mice, and B16-BL6 cells were implanted subcutaneously (s.c.) on day 3, 7, or 21 after DXR treatment. In the DXR-pretreated mice, the tumors grew at a slower rate than in control (saline-treated) mice. The experiments were repeated with a B16 variant resistant to DXR with similar results. Tumor growth retardation correlated with extent of myelosuppression monitored by counting bone marrow cells, circulating leukocytes and peritoneal macrophages. In DXR-pretreated mice reconstituted with 1 x 10(7) viable syngeneic spleen cells, the s.c. tumors grew at a rate similar to that in control mice. DXR treatment and spleen cell reconstitution experiments were repeated in BALB/c athymic nude mice. The results were very similar. The growth of s.c. tumors was directly correlated with the degree of peritumoral vascularity. These data indicate that in addition to its well-documented direct antitumor effects, DXR may produce retardation of tumor growth by producing myelosuppression and, hence, inhibition of host cell-induced tumor angiogenesis.
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PMID:Leukocyte-induced angiogenesis and subcutaneous growth of B16 melanoma. 752 86

JM216 is a novel antitumor platinum(IV) complex displaying oral activity, dose-limiting myelosuppression, and a lack of nephro- and neurotoxicity in rodents. It has been selected for clinical evaluation. The schedule dependency of its antitumor action against a murine (ADJ/PC6 plasmacytoma) and a human tumor model (PXN109T/C ovarian carcinoma xenograft) was studied in vivo. Single dose (q21d), once a day dosing for 5 consecutive days (q21d or q28d), and once a day dosing indefinitely (chronic daily dosing) administration schedules were compared. Against the murine ADJ/PC6 plasmacytoma, daily x5 administration improved the tolerance, antitumor potency, and therapeutic index of oral JM216, compared to single dose administration, whereas no advantage was found for fractionating cisplatin dosages. Against the PXN109T/C human ovarian carcinoma xenograft, oral JM216, given at dose levels delivering a equivalent total dose on single dose (200 mg/kg q21d), daily x5 (40 mg/kg/day q21d) and chronic daily dosing (9.5 mg/kg/d) schedules, showed superior tumor growth delays (55 +/- 15 days; P < 0.05) and maximal tumor regression (10 +/- 11% of initial tumor volume; P < 0.001) with the daily x5 schedule. Gastrointestinal toxicity (P < 0.05) and mild nephrotoxicity (P < 0.01) complicated the chronic daily dosing schedule, while leukopenia (P < 0.02) and thrombocytopenia (P < 0.01) were dose-limiting for the single dose and daily x5 administration, respectively. Peak plasma ultrafiltrate (PUF) platinum levels were below cytotoxic levels (PUF Cmax, 0.11 +/- 0.066 mg/l) at the maximally tolerable dose for the chronic dosing schedule (9.5 mg/kg). Peak PUF platinum levels did not increase significantly with a 5-fold increase in dosage from 40 mg/kg (PUF Cmax 1.5 +/- 0.11 mg/l) to 200 mg/kg (PUF Cmax, 2.4 +/- 0.44 mg/l; P > 0.05). In conclusion, these data demonstrate antitumor schedule dependency for oral JM216 in vivo, independently in two tumor model systems, and with nonlinear pharmacokinetics after its oral administration to mice. Optimal antitumor activity, tolerance, and pharmacokinetics occurred with daily x5 dosing, and this has prompted the clinical evaluation of this administration schedule.
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PMID:Schedule dependency of orally administered bis-acetato-ammine-dichloro-cyclohexylamine-platinum(IV) (JM216) in vivo. 803 45

This study examines the effects of a combined modality regimen of long duration-low temperature whole body hyperthermia (6 h at 40.0 degrees C; LL-WBH), recombinant human tumor necrosis factor-alpha (TNF) and carboplatin (CBDCA) on a transplantable fibrosarcoma as well as normal tissue. We compare LL-WBH with short duration-high temperature whole body hyperthermia (2 h at 41.5 degrees; SH-WBH). LL-WBH alone had no significant effect on tumor growth. Tumor growth delay (TGD) with TNF alone (0.1 days) and that with CBDCA alone (1.3 days) were significantly increased to 2.6 days (P < 0.05) and 2.8 days (P < 0.05), respectively, when combined with LL-WBH. Although TNF+CBDCA produced minimally increased TGD of 1.9 days, the combination of LL-WBH+TNF+CBDCA produced a significantly greater TGD of 5.6 days, compared to the other dual combinations (P < 0.01). There was no difference between TGDs for SH-WBH and LL-WBH in combination with TNF+CBDCA. Trimodality treatment-induced normal tissue toxicities, characterized by body weight loss, diarrhea, foot edema, and myelosuppression, were significantly greater in rats treated with SH-WBH+TNF+CBDCA, compared to LL-WBH+TNF+CBDCA. Histopathological examination also demonstrated that SH-WBH+TNF+CBDCA caused severe damage to the lymphoid tissues, intestinal tract, and peripheral microvasulature. We observed minimal histopathological changes observed in rats treated with LL-WBH+TNF+CBDCA. These data suggest that LL-WBH in combination with TNF and CBDCA has a greater therapeutic efficacy than SH-WBH.
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PMID:Therapeutic efficacy of long duration-low temperature whole body hyperthermia when combined with tumor necrosis factor and carboplatin in rats. 817 30

Carboplatin and etoposide were reported to be excellent radiation sensitizers. We encountered a patient with SVC syndrome due to lung cancer who was successfully treated by combination carboplatin, etoposide and hyperfractionation radiotherapy. A 72-year-old man was admitted to our hospital because of remarkable face edema. Computed tomography revealed a huge lung tumor and compressed SVC due to tumor growth. Acute tumor regression was essential for this case. We performed combination chemotherapy and radiation. The regime consisted of CBDCA 300 mg (day 1 1 hr drip infusion) and etoposide 50 mg/day for 21 days by oral administration. Two daily fractionations of 1.4 Gy were delivered 5 days-a-week, with a 4 h interval between fractions (total dose 49.8 Gy). Complete response of huge tumor was attained in this case. The major side effect associated with the therapy was myelosuppression. The patient's quality of life has been remarkably improved with this therapy.
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PMID:[A case of superior vena cava syndrome treated with combination radiation and CRE (CBDCA and VP-16) therapy]. 854 62

The intratumoral (i.t.) delivery of anticancer drugs aims at controlling tumor growth and thereby provides palliative treatment for liver neoplasms. Mitoxantrone is a good candidate for local or regional administration because (1) its metabolism is mainly hepatic, (2) it has a steep dose-response curve for multiple solid tumors, and (3) its fixation in tissues is sustained without vesicant effects after extravasation. We compared the tolerance, pharmacokinetics, and antitumor effects of mitoxantrone on hepatic VX2 tumors in rabbits treated with i.t. intraarterial hepatic (i.a.h.) or i.v. mitoxantrone, i.t. ethanol; or i.t. 0.9% NaCl and in control animals. Tumor growth rates (TGRs) were evaluated at 9 days after treatment. Myelosuppression was the limiting toxicity of i.v. mitoxantrone at 1.5 mg/kg (maximal tolerated dose, MTD), but neither i.t. nor i.a.h. administration led to hematologic toxicity at the same dose. The mitoxantrone retained in tumors after i.t. administration was seen as blue-stained areas of complete necrosis according to histologic analysis. Pharmacokinetic parameters showed a significantly decreased systemic exposure to the drug after both regional treatments, although the i.a.h. route appeared to have an edge over the i.t. route. TGRs were significantly reduced after i.t. mitoxantrone (81 +/- 62%), i.a.h. mitoxantrone (337 +/- 110%), and i.t. ethanol treatments (287 +/- 117%) as compared with control values (886 +/- 223%; p < 0.01). Treatment with i.v. mitoxantrone (816 +/- 132%) had no antitumor effect, nor did NaCl injections (868 +/- 116%). Mitoxantrone given i.t. induced the highest antitumor effects, resulting in a 3.5-fold reduction in TGRs as compared with i.a.h. mitoxantrone and i.t. ethanol treatments (p < 0.02). Treatment with i.t. mitoxantrone provided efficient antitumor therapy without producing major side effects. This method should be considered as palliative treatment for nonresectable liver tumors and other localized malignancies.
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PMID:Pharmacokinetics and antitumor effects of mitoxantrone after intratumoral or intraarterial hepatic administration in rabbits. 854 84

With the use of aggressive cis-platinum-based combination chemotherapy the majority of patients with metastatic testicular cancer will be cured. Hematopoietic growth factors (HGFs), particularly G- and GM-CSF, have been investigated for the treatment of testicular cancer in order to (a) ameliorate chemotherapy-induced myelosuppression, (b) increase the dose intensity of treatment, or (c) generate peripheral blood stem cells (PBSC) as hematopoietic support for mega-dose chemotherapy. Results from in vitro and animal models have excluded a significant influence of both factors, G-CSF and GM-CSF, on tumor growth and response to cytotoxic treatment. For the group of 'good-risk' patients with metastatic testicular cancer, 85-90% of whom will reach long-term survival, the incidence of granulocytopenic infections after standard chemotherapy regimens appears to be lower than 20%. The prophylactic use of HGFs for these patients is not routinely recommended but may be considered in case of an increased risk for infections. For 'poor risk' patients, who will achieve 50% survival following standard chemotherapy, different attempts of treatment intensification have been investigated. The use of aggressive multidrug regimens is associated with granulocytopenic infections in 20-70% of patients. A randomized trial has demonstrated that the prophylactic use of G-CSF significantly reduces granulocytopenia, the number of septic infections, and the infection-related death rate. For 'poor risk' patients the prophylactic use of HGFs, particularly G-CSF due to its favorable side effect profile, is recommended. The availability of G- and GM-CSF has made it possible to develop dose-intensified chemotherapy regimens. Demonstrated particularly for GM-CSF, a 1.5 fold dose increase can be achieved by the use of a myeloid growth factor alone, and thrombocytopenia and other organ toxicity will become dose limiting. Mobilization of PBSC, either after stimulation with HGFs alone or with HGFs, following chemotherapy has been successfully used in patients with testicular cancer. For the treatment of patients with relapsed disease PBSC support followed by HGFs has allowed the use of mega-dose therapy in multiple phase-II studies. This has prompted the investigation of high-dose therapy as first-line treatment for 'poor-risk' patients. In these patients sequential high-dose treatment with cis-platinum, etoposide, and ifosfamide for four consecutive cycles, each supported by G- or GM-CSF and PBSC, is currently being investigated by the German Testicular Cancer Study Group. HGFs have substantially reduced treatment-associated morbidity and mortality in patients receiving chemotherapy for testicular cancer. They make it possible for the first time to clinically explore the true value of dose-intensified chemotherapy regimens in testis cancer, serving as a model of a highly chemotherapy sensitive disease. Enrollment of patients in prospective clinical trials evaluating the role of high-dose therapy is strongly recommended.
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PMID:Hematopoietic growth factors and treatment of testicular cancer: biological interactions, routine use and dose-intensive chemotherapy. 860 73

Minimizing normal tissue toxicity can enhance the therapeutic gain of thermochemotherapy. For this purpose, we investigated the optimal duration of whole body hyperthermia (WBH) (41.5 degrees C) when administered simultaneously with carboplatin (CBDCA). Using a transplantable fibrosarcoma in Fischer 344 rats, we measured tumor growth delay (TGD) as well as normal tissue toxicities (body weight loss, thrombocytopenia) induced by various durations of WBH (0.5, 1.0, 1.5, 2.0 or 2.5 hours) when combined with CBDCA (30 mg/kg, i.v.). When combined with CBDCA, 1.0 hour WBH increased the TGD compared to 0.5 hour of WBH, but with WBH durations greater than 1.0 hour, the TGD did not further significantly increase. Measuring CBDCA-induced myelosuppression, the platelet count on day 6 post-treatment decreased from a control mean of 6.8 x 10(8)/ml to 1.8 x 10(8)/ml after 2.5 hour WBH exposure in a duration-dependent manner (p < 0.001). To estimate the specific therapeutic efficacy (STE), we calculated a ratio of TGD to myelosuppression (thrombocytopenia). Compared to other WBH exposure times, 1.0 hour duration of WBH combined with CBDCA produced the highest STE (2.8) and over 1.5 hour duration of WBH did not result in any additional increase in STE. We conclude that 1.0 hour WBH exposure is optimal when combined with CBDCA in order to maximize the therapeutic gain.
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PMID:Optimal duration of whole body hyperthermia when combined with cis-diaminne-1,1-cychlobutane dicarboxylate platinum (II) (carboplatin). 921 42

Recent studies suggest that the pineal hormone melatonin may reduce chemotherapy-induced immune and bone marrow damage. In addition, melatonin may exert potential oncostatic effects either by stimulating host anticancer immune defenses or by inhibiting tumor growth factor production. On this basis, we have performed a randomized study of chemotherapy alone vs. chemotherapy plus melatonin in advanced non-small cell lung cancer patients (NSCLC) with poor clinical status. The study included 70 consecutive advanced NSCLC patients who were randomized to receive chemotherapy alone with cisplatin (20 mg/m2/day i.v. for 3 days) and etoposide (100 mg/m2/day i.v. for 3 days) or chemotherapy plus melatonin (20 mg/day orally in the evening). Cycles were repeated at 21-day intervals. Clinical response and toxicity were evaluated according to World Health Organization criteria. A complete response (CR) was achieved in 1/34 patients concomitantly treated with melatonin and in none of the patients receiving chemotherapy alone. Partial response (PR) occurred in 10/34 and in 6/36 patients treated with or without melatonin, respectively. Thus, the tumor response rate was higher in patients receiving melatonin (11/34 vs. 6/35), without, however, statistically significant differences. The percent of 1-year survival was significantly higher in patients treated with melatonin plus chemotherapy than in those who received chemotherapy alone (15/34 vs. 7/36, P < 0.05). Finally, chemotherapy was well tolerated in patients receiving melatonin, and in particular the frequency of myelosuppression, neuropathy, and cachexia was significantly lower in the melatonin group. This study shows that the concomitant administration of melatonin may improve the efficacy of chemotherapy, mainly in terms of survival time, and reduce chemotherapeutic toxicity in advanced NSCLC, at least in patients in poor clinical condition.
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PMID:A randomized study of chemotherapy with cisplatin plus etoposide versus chemoendocrine therapy with cisplatin, etoposide and the pineal hormone melatonin as a first-line treatment of advanced non-small cell lung cancer patients in a poor clinical state. 937 41

PIXY321, a granulocyte-macrophage colony-stimulating factor/interleukin 3 (GM-CSF/IL-3) genetically engineered hybrid, has shown greater biological activity in stimulating committed myeloid progenitors than either GM-CSF or IL-3 in vitro, in vivo, and in patients treated with high-dose chemotherapy. However, one concern is that PIXY321 may stimulate the proliferation of malignant cells which have functional GM-CSF or IL-3 receptors. Therefore, using a human tumor cloning assay, we have tested the effects of several concentrations of PIXY321 ranging from 0.1 to 100 ng/ml on tumor cells taken directly from 98 patients with solid tumors and Hodgkin's or non-Hodgkin's lymphomas. Of the 34 evaluable specimens, including 15 breast cancers, 5 ovarian cancers, 5 lung cancers, and 9 lymphomas, none showed stimulation of tumor growth. Interestingly, a significant inhibition of the tumor proliferation was seen in one breast cancer and in one large cell immunoblastic non-Hodgkin's lymphoma after continuous exposure of PIXY321. In conclusion, the use of PIXY321 to reduce myelosuppression after high-dose chemotherapy appears unlikely to result in stimulation of the growth of malignant cells in patients with lymphoma or cancers of the breast, lung, and ovary.
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PMID:Effects of PIXY321, a granulocyte-macrophage colony-stimulating factor/interleukin 3 fusion protein, on human tumor colony-forming units taken directly from patients. 981 21

The combination of cyclophosphamide (CPA) and 5-fluorouracil (5-FU) is currently regarded as the most effective therapy for the treatment of patients with advanced and recurrent breast cancer. We evaluated the augmentation of antitumor activity and toxicity by coadministration of CPA and UFT (1M tegafur--4M uracil) instead of intravenous 5-FU on H-31 human breast cancer xenografts in nude mice. The maximum tolerable dose (MTD) of UFT alone (24 mg/kg) and CPA alone (85 mg/kg) had a significant effect on H-31 tumors in mice with 86.6% and 83.0% inhibition rates of tumor growth, respectively, and without loss of body weight, diarrhea or myelosuppression. The combined administration with full and 83.3% MTD of UFT and CPA augmented the antitumor activity compared to that of UFT alone and CPA alone. The relative tumor volume of the UFT plus CPA-treated group to the UFT- and CPA-treated groups was 0.28 and 0.36 for the full MTD, and 0.51 and 0.67 for 83.3% MTD, respectively. When CPA was consecutively administered to the tumor-bearing mice for 14 days, there were no decreases in the activities of enzymes related to 5-FU metabolism, but there was an significant increase in the activity of ribonucleotide reductase, suggesting that anabolism of 5-FU derived from tegafur is accelerated to some extent by coadministration of CPA. In conclusion, these results suggest that combination therapy with oral UFT and CPA may be useful for the long-term treatment of cancer patients with advanced and recurrent breast cancers.
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PMID:Antitumor efficacy of combination chemotherapy with UFT and cyclophosphamide against human breast cancer xenografts in nude mice. 1047 Jan 17


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