Breast Cancer

Over the past 20 years we have witnessed the emergence of a new generation of aromatase inhibitors as valuable antiestrogens in the management of both advanced and early-stage breast cancer. In addition, the list of cytotoxic chemotherapeutic agents useful in the control of breast cancer has grown considerably. The emergence of anthracyclines was a major chemotherapeutic step forward in the 1980s, and the taxanes have clearly been the agents with the greatest impact on breast cancer treatment over the past decade. The end of the past 2 decades has been characterized by a greater understanding of the molecular biology of breast cancer, rational drug design, and the development of agents that disrupt specific cellular targets and pathways. The development of better prognostic and predictive assays that employ a panel of genes involved in the malignant and metastatic phenotype promises to allow clinicians to better select patients who could forgo adjuvant chemotherapy. Finally, adjunctive and supportive therapy of breast cancer has evolved substantially over the past 20 years. This review will highlight some of the landmark accomplishments during this time, and offer a glimpse at where we might be 20 years from now.

Cases of osteonecrosis of the jaw (ONJ) have been reported with an increasing frequency over the past few years. ONJ is most often identified in patients with cancer who are receiving intravenous bisphosphonate therapy but it has also been diagnosed in patients receiving oral bisphosphonates for nonmalignant conditions. The condition involves exposed bone of the maxilla or mandible. Although it is often associated with a recent dental surgical procedure, spontaneous ONJ can also occur. Patients commonly present with symptoms. Through case reporting and clinical experience, there is a suggestion that the incidence of ONJ in patients with cancer receiving intravenous bisphosphonates ranges between 1% and 10%. Management of ONJ focuses on maximizing oral health, conservative actions with mouth rinses, antibiotics, and avoidance of unnecessary invasive dental procedures. The currently available data on ONJ are reviewed here.

Preliminary research suggests that the substance interleukin (IL)-21 might improve the effectiveness of the drug trastuzumab (Herceptin) in treating HER2-positive breast cancer. Laboratory and animal study findings suggest that this happens because the IL-21 boosts the cancer-killing activity of immune cells called natural killer (NK) cells, which attack the tumor.

A long-term, multicenter study has shown that the reduction in breast and ovarian cancer risk resulting from oophorectomy—the removal of the ovaries and fallopian tubes in women at genetically high risk for these diseases—varies according to the type of genetic mutation present. Specifically, women with mutations in the BRCA1 gene have a greater reduction in ovarian cancer risk following the surgery, while those with BRCA2 mutations have a larger decrease in breast cancer risk. The study results were presented in Atlanta at the American Society of Clinical Oncology annual meeting.

New 23-month follow-up data from the HERceptin Adjuvant (HERA) study, one of the largest breast cancer trials ever carried out, show that trastuzumab (Herceptin) following standard chemotherapy significantly reduced the risk of death by 34% for women with early-stage HER2-positive breast cancer.

Acceptance of expensive new technologies often rests on their proven cost-effectiveness within specific clinical scenarios. A recent article (Plevritis et al: Cost-effectiveness of screening BRCA1/2 mutation carriers with breast MRI. JAMA 295:2374-2384, 2006) suggested that adding breast MRI screening may be cost-effective for women of certain ages who carry BRCA1/2 gene mutations. To shed light on this subject, Cancer Care & Economics (CC&E) spoke with noted breast imaging expert Elsie Levin, MD, medical director of the Faulkner-Sagoff Breast Imaging and Diagnostic Centre in Boston.

The Study of Tamoxifen and Raloxifene (STAR) compared and contrasted the efficacy and side effects of tamoxifen, the established agent, with raloxifene (Evista)—a medicine that is currently used for the prevention of osteoporosis in high-risk postmenopausal women, but also reduces the incidence of breast cancer.

As the aging population in the United States continues to grow, the incidence of diseases of the elderly, such as breast cancer, are increasing. Many more elderly women are expected to be diagnosed with new breast cancers, most of them in an early stage. Appropriate treatment of these women is important, as they have poorer outcomes when undertreated. In this review, we will discuss the biology and treatment of early breast cancer in elderly women. We will focus on the role of comorbidity and its effect on life expectancy, treatment decisions, current recommendations for primary treatment with surgery, radiation and neoadjuvant strategies, and adjuvant treatment including local radiation therapy and systemic treatment with endocrine therapy, chemotherapy, and newer agents. Finally we will discuss the importance of clinical trials in the elderly.

As the aging population in the United States continues to grow, the incidence of diseases of the elderly, such as breast cancer, are increasing. Many more elderly women are expected to be diagnosed with new breast cancers, most of them in an early stage. Appropriate treatment of these women is important, as they have poorer outcomes when undertreated. In this review, we will discuss the biology and treatment of early breast cancer in elderly women. We will focus on the role of comorbidity and its effect on life expectancy, treatment decisions, current recommendations for primary treatment with surgery, radiation and neoadjuvant strategies, and adjuvant treatment including local radiation therapy and systemic treatment with endocrine therapy, chemotherapy, and newer agents. Finally we will discuss the importance of clinical trials in the elderly.

As the aging population in the United States continues to grow, the incidence of diseases of the elderly, such as breast cancer, are increasing. Many more elderly women are expected to be diagnosed with new breast cancers, most of them in an early stage. Appropriate treatment of these women is important, as they have poorer outcomes when undertreated. In this review, we will discuss the biology and treatment of early breast cancer in elderly women. We will focus on the role of comorbidity and its effect on life expectancy, treatment decisions, current recommendations for primary treatment with surgery, radiation and neoadjuvant strategies, and adjuvant treatment including local radiation therapy and systemic treatment with endocrine therapy, chemotherapy, and newer agents. Finally we will discuss the importance of clinical trials in the elderly.

The aromatase inhibitors (AIs) anastrozole (Arimidex), letrozole (Femara), and exemestane (Aromasin) are significantly more effective than the selective estrogen-receptor modulator (SERM) tamoxifen in preventing recurrence in estrogen receptor-positive early breast cancer. Aromatase inhibitors are likely to replace SERMs as first-line adjuvant therapy for many patients. However, AIs are associated with significantly more osteoporotic fractures and greater bone mineral loss. As antiresorptive agents, oral and intravenous bisphosphonates such as alendronate (Fosamax), risedronate (Actonel), ibandronate (Boniva), pamidronate (Aredia), and zoledronic acid (Zometa) have efficacy in preventing postmenopausal osteoporosis, cancer treatment-related bone loss, or skeletal complications of metastatic disease. Clinical practice guidelines recommend baseline and annual follow-up bone density monitoring for all patients initiating AI therapy. Bisphosphonate therapy should be prescribed for patients with osteoporosis (T score < -2.5) and considered on an individual basis for those with osteopenia (T score < -1). Modifiable lifestyle behaviors including adequate calcium and vitamin D intake, weight-bearing exercise, and smoking cessation should be addressed. Adverse events associated with bisphosphonates include gastrointestinal toxicity, renal toxicity, and osteonecrosis of the jaw. These safety concerns should be balanced with the potential of bisphosphonates to minimize or prevent the debilitating effects of AI-associated bone loss in patients with early, hormone receptor-positive breast cancer.

This month ONCOLOGY presents a special desk reference on the treatment and management of women with breast cancer, including discussion about adjuvant treatment of early disease and first-line cytotoxic chemotherapy for metastatic breast cancer.

Over the past 20 years we have witnessed the emergence of a new generation of aromatase inhibitors as valuable antiestrogens in the management of both advanced and early-stage breast cancer. In addition, the list of cytotoxic chemotherapeutic agents useful in the control of breast cancer has grown considerably. The emergence of anthracyclines was a major chemotherapeutic step forward in the 1980s, and the taxanes have clearly been the agents with the greatest impact on breast cancer treatment over the past decade. The end of the past 2 decades has been characterized by a greater understanding of the molecular biology of breast cancer, rational drug design, and the development of agents that disrupt specific cellular targets and pathways. The development of better prognostic and predictive assays that employ a panel of genes involved in the malignant and metastatic phenotype promises to allow clinicians to better select patients who could forgo adjuvant chemotherapy. Finally, adjunctive and supportive therapy of breast cancer has evolved substantially over the past 20 years. This review will highlight some of the landmark accomplishments during this time, and offer a glimpse at where we might be 20 years from now.

Cases of osteonecrosis of the jaw (ONJ) have been reported with an increasing frequency over the past few years. ONJ is most often identified in patients with cancer who are receiving intravenous bisphosphonate therapy but it has also been diagnosed in patients receiving oral bisphosphonates for nonmalignant conditions. The condition involves exposed bone of the maxilla or mandible. Although it is often associated with a recent dental surgical procedure, spontaneous ONJ can also occur. Patients commonly present with symptoms. Through case reporting and clinical experience, there is a suggestion that the incidence of ONJ in patients with cancer receiving intravenous bisphosphonates ranges between 1% and 10%. Management of ONJ focuses on maximizing oral health, conservative actions with mouth rinses, antibiotics, and avoidance of unnecessary invasive dental procedures. The currently available data on ONJ are reviewed here.

Over the past 20 years we have witnessed the emergence of a new generation of aromatase inhibitors as valuable antiestrogens in the management of both advanced and early-stage breast cancer. In addition, the list of cytotoxic chemotherapeutic agents useful in the control of breast cancer has grown considerably. The emergence of anthracyclines was a major chemotherapeutic step forward in the 1980s, and the taxanes have clearly been the agents with the greatest impact on breast cancer treatment over the past decade. The end of the past 2 decades has been characterized by a greater understanding of the molecular biology of breast cancer, rational drug design, and the development of agents that disrupt specific cellular targets and pathways. The development of better prognostic and predictive assays that employ a panel of genes involved in the malignant and metastatic phenotype promises to allow clinicians to better select patients who could forgo adjuvant chemotherapy. Finally, adjunctive and supportive therapy of breast cancer has evolved substantially over the past 20 years. This review will highlight some of the landmark accomplishments during this time, and offer a glimpse at where we might be 20 years from now.

Studies have suggested that women with low incomes residing in metropolitan areas might be less likely to be screened for breast cancer than more affluent women residing in the same areas.[1,2] However, few studies have examined the associations between breast cancer screening and both individual and area-based measures of socioeconomic status among women in metropolitan areas.[3,4] To examine these associations, the Centers for Disease Control (CDC) analyzed the percentage of women who had a mammogram by using individual data (ie, household income and education level) from the 2000 and 2002 Behavioral Risk Factor Surveillance System (BRFSS) surveys and area-based data (ie, percentages classified as living in poverty [annual family income below the federally defined poverty line] or at a low education level [less than a high school education]) from the 2000 US Census.

The patient presented to her primary care physician 3 months prior with an inverted left nipple and a palpable lump that was highly suggestive of neoplasm on mammogram. An ultrasound-guided core biopsy revealed an infiltrating solid-type ductal carcinoma in situ. The estimated size of the mass was approximately 1 cm. She had no symptoms suggestive of metastatic disease.

Genentech Seeks Expanded Use of Avastin in Breast Cancer

The monoclonal antibody denosumab (AMG 162) attenuates bone resorption in patients with breast cancer who have bone metastases as effectively as bisphosphonates, according to interim results of a trial reported at the 2006 ASCO meeting (abstract 512).

Investigators have begun enrolling women with early-stage breast cancer in the Trial Assigning Individualized Options for Treatment (Rx), commonly referred to as TAILORx, a long-term study designed to determine whether oncologists can use the Oncotype DX (Genomic Health, Inc.) recurrence score to assign women to the most appropriate and effective adjuvant treatments.

Peri- and premenopausal women may be more at risk for cognitive impairment than postmenopausal women as a result of adjuvant chemotherapy for breast cancer, according to preliminary data presented at the American Psychosocial Oncology Society (APOS) Third Annual Conference (abstract P3-5).

New data from a 5-year update of the bone subprotocol of the Arimidex, Tamoxifen, Alone or in Combination (ATAC) trial confirm that women with a normal bone mineral density (BMD) at the outset of treatment may be able to undergo a 5-year course of therapy with anastrozole (Arimidex) without the risk of developing osteoporosis.

GlaxoSmithKline (GSK) announced results from a large, randomized, pivotal phase III study of its investigational small-molecule dual kinase inhibitor lapatinib ditosylate (Tykerb). In this study, the combination of lapatinib and capecitabine (Xeloda) vs capecitabine alone nearly doubled time to progression (36.9 weeks in the combination arm vs 19.7 weeks with capecitabine alone, P = .00032) in women with refractory advanced or metastatic HER2 (ErbB2)-positive breast cancer whose disease had progressed following treatment with trastuzumab (Herceptin) and other cancer therapies.

Young, black breast cancer patients are much more likely than young white patients to have tumors that lack receptors for estrogen, progesterone, and HER2, according to a new, population-based study in about 500 women. This means that many breast cancer patients, including almost half of young black patients, "have tumors for which there is no targeted therapy," said lead author Mary Jo Lund, PhD, assistant professor of epidemiology, hematology, and oncology, Rollins School of Public Health and Winship Cancer Institute, Emory University, Atlanta.

Lapatinib (Tykerb), an oral small-molecule reversible dual inhibitor of HER1 (EGFR) and HER2 tyrosine kinases, is emerging as a promising option for HER2-positive breast cancer patients, investigators of phase II and III trials reported at the 42nd Annual Meeting of the American Society of Clinical Oncology (ASCO). Clinical evidence suggests that lapatinib, unlike trastuzumab (Herceptin), can cross the blood-brain barrier to treat brain metastases, which develop in about one-third of HER2-positive breast cancer patients.

Vitamin D appears to lower the risk of breast cancer, but far greater amounts are needed than most women normally take in, according to two studies presented at the 97th Annual Meeting of the American Association for Cancer Research.

Treatment of metastatic breast cancer is "a book with many chapters, ie, with many opportunities for meaningful intervention, as opposed to pancreatic cancer, for example," Andrew Seidman, MD, said in his discussion of metastatic breast cancer at the Second Annual Advances in Oncology meeting, sponsored by the journal ONCOLOGY.

Abandoning the tamoxifen market to its generic competitors, AstraZeneca will cease commercial manufacturing of Nolvadex by the end of June. "Once commercial supplies are exhausted, your patients will no longer be able to obtain brand name Nolvadex tablets," Kenneth A. Kern, MD, the company's director of clinical research, wrote health care professionals in a letter released by the US Food and Drug Administration.

According to a new study, women who gain weight in adulthood face a higher lifetime risk of all types of breast cancer even if they do not take hormone replacement therapy after menopause. To be published in the July 1, 2006, issue of CANCER, the study reveals that the greater the weight gain as an adult, the greater the risk for all histologic types, tumor stages, and grades of breast cancer, particularly advanced malignancies.

Nancy E. Davidson, MD, a medical oncologist who has specialized in breast cancer for more than 20 years, has been elected to become president of the American Society of Clinical Oncology (ASCO) for a 1-year term beginning in June 2007. She took office as president-elect this month, during ASCO's 42nd annual meeting in Atlanta.