Breast Cancer

More than 2.5 million breast cancer survivors live in the US today.[1] This number will continue to grow thanks to early detection and advances in treatment that are making early stage breast cancer an increasingly curable disease.

A combination of two targeted therapies already shown to be effective in breast cancer

The patient, “TB,” is a 44-year-old Caucasian, married woman with three daughters, 21, 18, and 10 years of age.

Why doesn't cisplatin work very well against breast cancer? The first response of most researchers would be to invoke something about genetic responses, but a pair of biologists from the University of Cincinnati have raised a quite different proposalr: The unique hormonal milieu of the breast may contribute to chemoresistance.

The regimented and inflexible protocols that have long served as hallmarks of clinical trials are giving way to personalized medical research. A clinical trial begun last week at the University of California, San Francisco will use genetic and biological markers drawn from the tumors of individual patients to identify the treatments most likely to be effective for those participating in the trial.

Over the past decade, the oncology community has made significant progress in the development of highly effective treatment modalities for breast cancer. Moreover, our increasing knowledge of the molecular biology of cancer has engendered the potential to use gene expression profiling, molecular fingerprinting, and biomarkers to add increased, patient-specific value to our clinical decision making. More than ever, today’s clinician must keep up to date on the rapid scientific advances in breast cancer management.

Study in Asian population runs counter to previous concern that phytoestrogen in soy may increase disease risk.

Next-generation genomic assay technologies are revolutionizing our ability to characterize cancers at the genomic levels, providing critical prognostic and predictive information for individual patients with breast cancer, thereby helping to guide treatment decisions. According to Harold J. Burstein, MD, PhD, Associate Professor of Medicine, Harvard Medical School, these emerging technologies will change the way we treat breast cancer.

For oncologists battling breast cancer in the clinic, one of the most difficult decisions is choosing the optimal adjuvant therapy, one that balances the fine line between efficacy and toxicity. Clifford A. Hudis, MD, Chief, Breast Cancer Medicine Service at Memorial Sloan-Kettering Cancer Center, tackled this difficult clinical discussion in an interview with ONCOLOGY.

Nationally recognized breast cancer specialist Eric P. Winer, MD, presented two lectures at this year’s MBCC, “Strategies for Patients with Refractory HER2-Positive Breast Cancer,” and “Addressing Menopausal Symptoms and Fertility in Breast Cancer.” In an exclusive interview with ONCOLOGY, Dr. Winer explained how hormonal therapy can best be used in the difficult stetting of metastatic disease.

Ron Piana, Executive Editor for Special Projects with the journal ONCOLOGY, spoke with nationally regarded breast cancer specialist, Dr. Debu Tripathy, co-course director for the 27th Annual Miami Breast Cancer Conference.

Less than 1% of women took tamoxifen in the years 2000 and 2005 as a preventive measure, according to results of a recent survey.

None; investigational agents olaparib (AZD2281) and BSI-201 are in phase I and II clinical trials; other PARP inhibitors under investigation include AGO 14699 (Pfizer), ABT-888 (Enzo), and MK4827 (Merck).

The RANK ligand inhibitor was better tolerated and more convenient for patients with skeletal metastasis.

Large clinical trials have demonstrated that preoperative therapy for primary operable breast cancer improves breast-conservation rates, with equivalent disease-free (DFS) and overall survival (OS) compared to adjuvant therapy.[1] Connolly and Stearns provide an excellent review of additional benefits of neoadjuvant therapy and emphasize the importance of a multidisciplinary approach to treating patients in this setting.

While the administration of neoadjuvant chemotherapy is recommended for women with locally advanced breast cancer, its use in the primary operable setting has been debated and is the focus of this review.

Agendia, a leader in molecular cancer diagnostics, recently announced that the US Food and Drug Administration (FDA) cleared its MammaPrint breast cancer recurrence test for all ages. MammaPrint is the only FDA-cleared breast cancer recurrence test available to patients and physicians. Over the past 3 years, the FDA has issued four clearances for MammaPrint, covering all aspects of this service.

Investigators from the Breast International Group 1-98 study and the Intergroup Exemestane Study updated their respective trial results at SABCS 2009.

Multi-targeted TKI inhibitors are gaining traction in the treatment of advanced breast cancer, although results from four different trials do show varying degrees of efficacy.

A 30-year study of nearly 20,000 Danish women made a defensible connection between obesity and poor prognosis after breast cancer diagnosis and treatment.

The targeted combination of lapatinib (Tykerb) plus trastuzumab (Herceptin) led to a median overall survival of 14 months in women with refractory metastatic breast cancer.

The Four Corners Breast Cancer Study is a population-based case-control study of women living in the southwestern states-Arizona, New Mexico, Colorado, and Utah.

The standard for delivering the best quality of care to breast cancer patients calls for surgeons to consult with other specialists and to provide resources and education to help patients decide their course of treatment. That doesn't mean they do it.

Pharmacologic strategies targeting the DNA of tumor cells have been in use for much of the past century for many different cancer types. Radiation has also been a long-employed strategy to cause DNA damage and subsequent tumor cell death. However, the class of agents designed to inhibit the enzyme poly-(ADP-ribose) polymerase (PARP) have taken this a step further-these agents do not damage DNA themselves, but rather, inhibit the repair of DNA via inhibition of the base excision single-strand repair pathway. PARP inhibitors have been shown preclinically and clinically to enhance the affects of chemotherapies known to damage DNA or interefere with DNA replication. However, the most exciting use of PARP inhibitors may be in exploiting the concept of synthetic lethality. In this setting, the concept is based on two factors: (1) BRCA1/2-positive malignancies cannot use one of the major pathways to repair double-strand DNA breaks (ie, homologous recombination), and (2) making the base excision repair pathway nonfunctional via inhibition of PARP leads to tumor cell death, as unrepaired single-strand breaks are converted into double-strand breaks.

In this issue of ONCOLOGY, Comen and Robson provide a timely overview of poly(ADP-ribose) polymerase (PARP) inhibitors and their potential for the treatment of breast cancer. The authors highlight the recent demonstration of synthetic lethality between PARP inhibition and loss of either of the breast cancer susceptibility genes, BRCA1 and BRCA2, as well as the development of PARP inhibitors that are suitable for clinical therapy. However, many questions pertaining to both the basic biology of PARP inhibition and the potential clinical implications of PARP inhibitors still need to be addressed. In the following commentary, we highlight some of these remaining challenges.

As knowledge increases about the processes underlying cancer, it is becoming feasible to design “targeted therapies” directed toward specific pathways that are critical to the genesis or maintenance of the malignant phenotype. Poly(ADP-ribose) polymerase (PARP) inhibitors are an example of this new framework. DNA damage repair is a complex and multifaceted process that is critical to cell survival. Members of the PARP family are central to specific DNA damage repair pathways, particularly the base excision repair (BER) pathway. PARP inhibition, with subsequent impairment of the BER mechanism, may enhance the cytotoxicity of agents that generate single-strand breaks in DNA, such as radiation and certain chemotherapy drugs. In addition, PARP inhibitors may induce death through “synthetic lethality” if the DNA repair mechanisms that rescue BER-deficient cells are themselves impaired. This mechanism is thought to underlie the impressive results of PARP inhibition in BRCA-associated breast and ovarian cancer, and may also account for the reported benefit of this approach in “triple-negative” breast cancer. This review will examine the current understanding of PARP inhibition as a treatment for breast cancer, ongoing clinical trials, and future directions for this new approach.

A U.S. Preventive Services Task Force recommendation that routine breast cancer screening should begin at age 50, and take place every two years, did not sit well with the breast cancer community. The new recommendations will result in “many needless deaths,” stated the Society of Breast Imaging and the American College of Radiology.

Over 40 million men and women in the United States have osteoporosis and low bone mineral density (BMD), placing them at risk for adverse skeletal events such as fractures and their sequelae. There are over 12 million cancer survivors in this country. Of these, 22% were diagnosed with breast cancer and 17% with prostate cancer.[1,2] Because cancer therapies can adversely influence bone health, these survivors are at particular risk for skeletal complications. Cancer therapies associated with bone loss include hormone deprivation therapies such as aromatase inhibitors, ablative surgical procedures that induce hypogonadal states, and premature menopause induced by chemotherapy.[3,4]

Many women continue to experience pain and sensory disturbance up to three years after breast cancer treatment, according to Danish researchers, who found that younger women in particular reported persistent pain. They called for further strategies for improving pain management after breast surgery.

This article will review and summarize the current data regarding the influence of the major cytochrome P450 2D6 (CYP2D6) genotypes and CYP2D6 inhibitors on tamoxifen metabolism and clinical efficacy. We will discuss the clinical relevance and limitations of this data and how to best incorporate our current understanding of CYP2D6 genotyping into our clinical practice and discussions with patients.