European journal of cancer : official journal for European Organization for Research and Treatment of Cancer (EORTC) [and] European Association for Cancer Research (EACR)
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Randomized Controlled Trial Multicenter Study Clinical Trial
Improved quality of life after long-term treatment with the bisphosphonate ibandronate in patients with metastatic bone disease due to breast cancer.
Bone metastases occur in most women with advanced breast cancer and can lead to considerable morbidity and a rapid deterioration in the patient's quality of life. It was the aim of the present study to assess changes in quality of life and bone pain due to intravenous (i.v.) ibandronate, a potent third-generation bisphosphonate. In a phase III randomised, double-blind, placebo-controlled trial in patients with bone metastases due to breast cancer, 466 women were randomised to receive placebo, 2 mg ibandronate or 6 mg ibandronate for up to 96 weeks. ⋯ Overall, at the last assessment, the 6 mg ibandronate group showed significantly better functioning compared with placebo (P = 0.004), and had significantly better scores on the domains of physical, emotional, and social functioning, and in global health status (P < 0.05). Significant improvements in the symptoms of fatigue and pain were also observed in the 6 mg ibandronate group. I.v. ibandronate treatment leads to significant improvements in quality of life, and is an effective and well-tolerated palliative treatment in patients with bone metastases due to breast cancer.
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Randomized Controlled Trial Multicenter Study Clinical Trial
Predictors of non-sentinel lymph node metastasis in breast cancer patients.
In many patients, the sentinel lymph node (SLN) is the sole site of regional nodal metastasis. This subgroup of patients would not be expected to benefit from completion axillary lymph node dissection (CALND). This study evaluated the factors that may determine the likelihood of additional positive nodes in the axilla in the presence of sentinel node metastasis. ⋯ Increasing tumour burden in the SLN was associated with additional positive nodes in the axilla. Multivariate analysis revealed that size of the SLN metastasis is the most important predictor of involvement of only the SLN. Overall, in patients with a positive SLN, the difference in the number of positive and negative SLNs removed and size of the metastasis in the SLN, all predicted the frequency of additional positive nodes.
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(E)-2'-Deoxy-2'-(fluoromethylene) cytidine (FMdC), an inhibitor of ribonucleotide diphosphate reductase (RR), is a potent radiation-sensitiser acting through alterations in the deoxyribonucleoside triphosphate (dNTP) pool in the de novo pathway to DNA synthesis. The activity of thymidine kinase (TK), a key enzyme in the 'salvage pathway', is known to increase in response to a lowering of dATP induced by FMdC. Nucleoside analogues such as iododeoxyuridine (IdUrd) are incorporated into DNA after phosphorylation by TK. ⋯ This significant increase in radiation sensitivity with the combination of FMdC and IdUrd could not be explained by changes in the dNTP pattern since the addition of IdUrd to FMdC did not further reduce the dATP. However, the increase in the radiation sensitivity of WiDr cells might be due to increased incorporation of IdUrd after FMdC treatment. Indeed, a specific and significant incorporation of IdUrd into DNA could be observed with the [(125)I]-IdUrd incorporation assay in the presence of 1 microM unlabelled IdUrd when combined with FMdC treatment.
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Orthotopic tumour models for colorectal cancer are a complementary tool for the study of tumours in vivo. They are more closely related to human cancer than are subcutaneous tumour models, since evaluation of spontaneous metastasis formation is possible. In the present study, fragments of subcutaneous xenografts established from 12 well-described and generally available colorectal cancer cell lines were implanted in the caecum of nude mice and tumour growth and metastatic events registered. ⋯ This resulted in variable disease progression that seemingly reflects clinically relevant heterogeneity. The most common metastatic findings were mesenteric lymph-node metastases, occurring at variable frequency in tumour-bearing mice with 10 out of 12 cell lines, whereas only one line gave rise to liver metastases, in two of 10 animals. The study provides useful background information on the 12 colorectal cancer cell lines in a clinically relevant orthotopic tumour model.