Active clinical trials for "Breast Neoplasms"

The aim of this study is to determine the effect of aromatase inhibitors therapy on bone mineral density and compare it to the effects of tamoxifen and no hormonal therapy.

The purpose of this research study is to study the effects of stopping aromatase inhibitory (AI) therapy on breast cancer progression. Aromatase inhibitors are a class of drugs used to treat breast cancer in postmenopausal women. They work by decreasing the level of estrogen, which is believed to stimulate the growth of tumor tissue. Breast cancer that progresses despite therapy with an AI is thought to have been resistant to AI therapy. There is scientific evidence to suggest that resistant breast cancer cells learn to grow at the very low levels of estrogen present on AI therapy and that increasing estrogen levels even slightly by stopping AI therapy with inhibit the breast cancer cells. An improvement or stabilization of breast cancer has been observed after stopping therapy with tamoxifen, a different anti-estrogen therapy, and has been reported in the literature after stopping AI therapy. This research study will be the first study to formally test the rate of disease improvement (response) or stabilization after stopping AI therapy.

RATIONALE: Gathering information about how often osteonecrosis of the jaw occurs in patients receiving zoledronic acid for bone metastases may help doctors learn more about the disease and provide the best follow-up care. PURPOSE: This clinical trial is studying osteonecrosis of the jaw in patients with cancer who are receiving zoledronic acid for bone metastases.

The objectives of this study is to obtain information of Faslodex use in the treatment of breast cancer in the clinical practice in Argentina.

The investigators plan to examine endoxifen and 4-OH-Tam as a function of the tamoxifen dose in patients with a genetic CYP2D6 polymorphism. The investigators also plan to investigate other genetic variations in the metabolism of tamoxifen.

RATIONALE: Studying samples of tumor tissue from patients with cancer in the laboratory may help doctors learn more about changes that occur in DNA and identify biomarkers related to cancer. It may also help doctors understand how well patients respond to treatment. PURPOSE: This laboratory study is examining tumor tissue samples from patients with breast cancer treated with bevacizumab on clinical trial ECOG-2100 to learn more about DNA changes and response in these patients.

RATIONALE: Measuring levels of calgranulin A and calgranulin B in the blood of patients with breast cancer in the laboratory may help doctors identify and learn more about biomarkers related to breast cancer. PURPOSE: This laboratory study is measuring calgranulin A and calgranulin B levels in the blood of patients with newly diagnosed stage I, stage II, or stage III breast cancer.

RATIONALE: Studying samples of tumor tissue from patients with cancer in the laboratory may help doctors learn more about changes that occur in DNA and identify biomarkers related to cancer. PURPOSE: This research study is looking at tumor samples from women who have undergone chemotherapy for breast cancer.

RATIONALE: Measuring blood levels of tumor cells in patients with breast cancer may help doctors predict how patients will respond to treatment. PURPOSE: This laboratory study is looking at blood levels of tumor cells in predicting response in patients receiving first-line chemotherapy for stage IV breast cancer.

RATIONALE: Collecting and storing samples of blood and tumor tissue from patients with cancer to test in the laboratory may help the study of cancer in the future. PURPOSE: This clinical trial is studying blood and tumor tissue samples in women with invasive breast cancer, ductal carcinoma in situ, lobular carcinoma in situ, or benign breast disease.