Oncology
-
As a result of improved local and regional control with aggressive multimodality protocols, the brain has become one of the major sites of relapse in patients with locally advanced non-small cell lung carcinoma (LA-NSCLC). The demonstrated efficacy of prophylactic cranial irradiation (PCI) in small-cell lung carcinoma led to studies of its effectiveness in LA-NSCLC, which indicated that PCI also has a high potential to reduce the incidence or delay the occurrence of brain metastases in this patient group. This report provides an extensive review of the current evidence from nonrandomized and randomized trials regarding the use of PCI in LA-NSCLC and discusses related key issues including risk factors, patient selection criteria, timing of PCI, preferred PCI dosing scheme, toxicity profile and potential novel PCI techniques.
-
Analysis by DNA microarrays has led to the identification of molecular subtypes of breast carcinomas that show a distinct expression profile. Several studies have demonstrated that this 'intrinsic subtype' classification has a strong prognostic value. In addition, gene expression profiling techniques have been used to identify gene signatures that could be associated with the outcome of breast cancer patients. ⋯ Genetic signatures that might predict the activity of specific chemotherapy agents have also been developed by using gene expression profiling techniques. The same approach has been used to identify gene signatures associated with the activation of oncogenic pathways that might represent targets for molecular therapy of breast cancer. By using these approaches, gene expression techniques might significantly improve our ability to predict the risk of recurrence and to tailor the treatment for each individual breast cancer patient.
-
Dysregulation of human epidermal growth factor receptor (ErbB/HER) pathways by over-expression or constitutive activation can promote tumor processes including angiogenesis and metastasis and is associated with poor prognosis in many human malignancies. In addition to cancer, ErbB signaling has also been implicated in cardiovascular and neurodegenerative diseases. ⋯ Accordingly, the ErbB receptor family with their most prominent members EGFR and HER-2 represents validated targets for anti-cancer therapy, and anti-ErbB MoAbs (cetuximab, panitumumab, and trastuzumab) and TKIs (gefitinib, erlotinib, and lapatinib) have now been approved for the treatment of advanced colorectal cancer, squamous cell carcinoma of the head and neck, advanced non-small-cell lung cancer, as well as pancreatic and breast cancer. Although results have been encouraging, more work remains to be done.
-
HER2-positive breast cancer is characterized by high chemosensitivity. Anthracycline-based chemotherapy is recognized as a very effective adjuvant treatment in HER2-positive disease. One of the possible explanations is the co-amplification of TOPO II-alpha and HER2. ⋯ Trastuzumab added to chemotherapy administered for one year is associated with improvement in disease-free survival and sometimes in overall survival compared to chemotherapy alone. Efficacy of trastuzumab in the adjuvant setting seems to be increased if administered concomitantly with chemotherapy instead of sequentially. However, the interpretation of longer follow-up results is difficult because of a large crossover from the control arm to trastuzumab.
-
Ovarian suppression has been used to treat hormone-responsive metastatic breast cancer in premenopausal women for over 100 years and is currently under continued evaluation for treatment in the adjuvant setting. In this article, ovarian suppression by surgery, radiation, and pharmacological therapy is discussed, including the risks, benefits, and efficacy of each strategy. The role of ovarian suppression in premenopausal women with early and advanced stages of breast cancer will be reviewed. It is hoped that this review will assist clinicians and their patients in selecting the appropriate therapy if ovarian suppression is indicated.