Examination of the mechanisms of osteolysis in patients with metastatic breast cancer.

The benefits of bisphosphonates (BPs) in reducing skeletal-related events (SREs) in patients with bone metastases has mainly been attributed to their potent osteoclast inhibiting effect. However, despite the use of modern systemic anticancer therapy including potent BPs, many patients with bone metastases continue to have SREs. An improved understanding of the fundamental mechanisms of bone destruction allows for further development of appropriate targeted treatments. In this study, archival paraffin-embedded bone metastases specimens from patients with metastatic breast cancer were examined for the presence of osteoclasts, expression of the receptor activator of nuclear factor kappaB (RANK), RANK Ligand (RANKL), osteoprotegerin (OPG) and vascular endothelial growth factor (VEGF). Histological specimens were available for primary breast cancer, lymph node metastases, normal breast and normal bone tissues for comparison. Bone metastasis specimens were available for 20 BP naïve patients and two BP-treated patients. Osteoclasts were significantly increased in the bone metastases of the BP naïve group compared to normal bone. No osteoclasts were detected in the BP-treated group. RANKL was predominantly expressed in osteoblasts and in the stromal elements of metastatic tissue. Conversely, RANK was present in osteoclasts of bone metastases and normal bone, as well as in tumor cells of metastatic lymph nodes and bone metastases. VEGF was strongly expressed in the control bone and bone metastases regardless of BP treatment. In summary, osteoclasts may not be the singular obligatory factor for osteolysis in bone metastases. An increased expression of RANKL in stromal tissue surrounding bone metastases, RANK in osteoclasts and VEGF may serve as future targeted therapies possibly in conjunction with bisphosphonates. The mechanisms for osteoclast expression and the expression of RANKL, RANK, OPG and VEGF merit further prospective analysis, particularly in the context of BP treatment and progressive bone metastases.

Targeting blood vessels for the treatment of non-small cell lung cancer.

Non-small cell lung cancer (NSCLC) is the leading cause of cancer-related mortality worldwide. Although modest survival benefit has been observed with surgery, radiotherapy and platinum-based chemotherapy, an efficacy plateau has been reached. It has become obvious, therefore, that additional treatments are needed in order to provide an improved survival benefit for these patients. The use of molecular targeted therapies, particularly those against tumor capillaries, has the potential to improve outcomes for NSCLC patients. Bevacizumab, a recombinant humanized monoclonal antibody against vascular endothelial growth factor (VEGF), is the first targeted drug that has shown survival advantage when combined with chemotherapy in NSCLC. Other antivascular agents, including vascular disrupting agents (VDAs) and different small-molecule receptor tyrosine kinase inhibitors, have also shown promise in phase I and II trials in NSCLC. The aim of this study is to describe the clinical properties of these drugs and to discuss the evidence that supports their use in the treatment of NSCLC. Furthermore, we plan to review the main pitfalls of antivascular strategies in NSCLC cancer therapy as well as assess the future direction of these treatment methods with an emphasis on clarifying the molecular background of the effects of these drugs and defining the biomarkers.