The role of insulin-like growth factor-I receptor in the development of Herceptin resistance.
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Biomedical subjects
Publications and source records attributed to Paolo Morandi.
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BACKGROUND: The authors examined the published evidence on the use of aromatase inhibitors (AIs) in the adjuvant setting in postmenopausal, hormone receptor-positive patients, and they provide recommendations for clinical management in 3 different situations: newly diagnosed women, women who have already received tamoxifen for 2-3 years, and women who have completed 5-years of tamoxifen and are disease free. METHODS: All double-blind, randomized, prospective studies were reviewed. Data sources included the MEDLINE data base, reviews, editorials, and experts. RESULTS: The Arimidex, Tamoxifen Alone or in Combination (ATAC) trial, the Intergroup Exemestane Study (IES), and the MA-17 trial confirmed the superiority of AIs over tamoxifen in women with early-stage breast carcinoma, improving disease-free survival (DFS) considerably. In the ATAC trial, the 4-year DFS rate was 86.9% on anastrozole and 84.5% on tamoxifen (P = 0.03); in the IES, the 3-year DFS rate was 91.5% on exemestane and 86.8% on tamoxifen (P = 0.00005); and, in MA-17, the 4-year estimated DFS rate was 93% on letrozole and 87% on placebo (P < or = 0.001). All studies were limited because of the immaturity of data, particularly concerning long-term safety. A negative impact on bone health was observed in all three trials. However short-term side effects were acceptable. In addition, the studies demonstrated a significant reduction in the frequency of new primary tumors in the contralateral breast. CONCLUSIONS: Current data support anastrozole as first-line adjuvant hormonal therapy, or a change to AIs after 2-3 years of tamoxifen, or the use of letrozole at the end of a 5-year course of tamoxifen as first-choice treatment options for the management of hormone receptor-positive breast carcinoma in postmenopausal women. Ongoing clinical trials should help to define the precise timing, duration, and sequencing of AI therapy, in addition to the long-term tolerability profile and potential differences between anastrozole, letrozole, and exemestane.
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Human papillomavirus (HPV) type 16 is causally associated with a subset of oral cancers, predominantly those cancers arising in the oropharynx (OP). Increased HPV16 E6 and E7 oncogene expressions are responsible for the malignant transmission in these cancers. ErbB-2 is the family member most closely implicated in human cancer, where it is overexpressed in about 30% of carcinomas including head and neck squamous cell carcinoma. Coexpressions of E6/E7 and ErbB-2 downregulate E-cadherin and catenin expression, therefore induces metastatic process. Trastuzumab is a humanized monoclonal antibody that recognizes the ErbB-2 protein receptor and breakthrough in the treatment of metastatic breast cancer in combination with chemotherapeutic agents. This antibody is also in clinical testing for adjuvant treatment of breast cancer. We propose that trastuzumab as an adjuvant treatment may decrease process of tumor metastasis in oropharyngeal cancer patients who completed primary treatment (surgery and/or radiotherapy) and show expression of both HPV16 E6/E7 and erbB-2 oncoproteins. In vitro and in vivo studies with trastuzumab in these subgroup of patients may support our hypothesis.
Chemotherapy is an established approach for several malignancies, but its utility may be hampered by induced cardiac toxicity possibly leading to heart failure, with a negative impact on the patient's quality of life and ultimately survival. Prospective left ventricular systolic function monitoring has demonstrated that cardiotoxicity could be subclinically present for many months or years before its overt manifestation. Although considered irreversible, some reports suggested recovery or delayed progression of cardiac dysfunction by preventive cardioactive therapies. Thus, the identification of earlier instrumental or biochemical markers of cardiac injury able to predict heart failure remains a major task. Diastolic indexes as a primary expression of hemodynamic dysfunction after cardiac damage, analyzed by means of conventional or newer Doppler technologies (tissue Doppler, color M-mode, etc.) are discussed. Moreover, brain natriuretic peptides, troponins and endothelin-1, as possible sensitive/specific markers/predictors of subclinical cardiotoxicity are reviewed in order to update and possibly improve the strategy for the detection and clinical management of chemotherapy-related cardiotoxic effects.
Although high-dose cyclophosphamide (HD-CTX) is commonly used as a mobilising regimen for autologous peripheral blood stem cell (PBSC) collection, significant morbidity and insufficient harvesting may complicate the procedure. Alternative regimens and lower doses of cyclophosphamide (CTX) have been investigated as possible ways of overcoming these difficulties. Low-dose CTX (1.5 g/m2) was administered to 102 lymphoma patients as an autologous PBSC mobilising regimen. The collection of 6 x 10(6) CD34+ cells/kg was chosen as the target of the apheresis sessions, whereas 3 x 10(6)/kg were considered the minimum necessary to perform autologous stem cell transplantation (ASCT) safely. The apheretic sessions were started a median of eight days after CTX administration; a median of two aphereses was required. More than 6 x 10(6) CD34+ cells/kg were collected from 78 patients, between 3 and 6 x 10(6)/kg from 19, and fewer than 3 x 10(6)/kg from 5, two of whom underwent bone marrow harvesting and one a successful second PBSC harvesting session using the same mobilising regimen. Eighty-two patients underwent autografting, six of whom received a second transplant after relapse (five using autologous PBSCs coming from the first apheretic course). Low-dose CTX proved to be a safe and effective regimen for autologous PBSC mobilization and also compared favourably with alternative regimens in terms of the rate of harvesting insufficiency. This does not imply that low-dose CTX is the best mobilising regimen for all patients, and the identification of prognostic factors predicting mobilising potential may help in choosing the best individualised regimen.