Ovarian Cancer

The Trimbles have provided auseful overview of the majorclinical and pathobiologic issuesinvolving ovarian borderlinetumors (also termed atypical proliferativetumors or tumors of low malignantpotential). The borderline category ofovarian tumors comprises a heterogeneousgroup of neoplasms that, whensubdivided according to histologicappearance and the presence of peritoneallesions, form distinctive subgroups,each with characteristicpathologic features and a distinctiveclinical course. Thus, retrospectivereviews of thousands of reported caseshave shown that borderline tumors ofall types that are confined to the ovaries(ie, lack peritoneal “implants”)are associated with virtually 100%survival and an extremely low recurrencerate.[1]

Clinical and laboratory reports suggest that ovarian tumors of lowmalignant potential (LMP) represent a “grab bag” of tumors, withdifferent etiologies, molecular biologies, and prognoses. As a result,data on incidence and prognosis may be quite unreliable. Diagnosis isbest made on permanent section. Half of women under age 40 undergoconservative, fertility-sparing surgery when diagnosed with anovarian tumor of LMP, but no adjuvant therapy has been shown toprolong survival in this population. In addition to the various controversiessurrounding LMP tumors, this review will address prognosticmarkers, risk of malignant transformation, treatment of progressivedisease, surveillance after conservative surgery, and future directionsfor research.

CHAPEL HILL, North Carolina-Mass spectroscopy-based screening of serum samples from men with elevated PSA levels can distinguish benign from malignant disease and significantly reduce the need for biopsies, according to David Ornstein, MD, and his colleagues at the Food and Drug Administration (FDA) and National Cancer Institute (NCI). Dr. Ornstein is assistant professor of surgery, Division of Urology, University of North Carolina School of Medicine. [See Figure]

This special supplement toOncology News International presents11 reports on novel agents targetingHER1/EGFR, VEGF, and HER2/neu receptorsin the treatment of non–small-cell lung cancer,colorectal cancer, mesothelioma, andglioblastoma. The reports summarizeselected presentations from theAmerican Society of Clinical Oncology (ASCO)39th Annual Meeting and a satellitesymposium held in conjunction with ASCO.

Advances in biotechnology and basic immunology have convergedto create an unprecedented opportunity to use vaccines to harness thepower of the immune system in the fight against breast cancer. Cancervaccines have several therapeutic advantages over more traditionalbreast cancer treatment modalities. First, targeting the antitumorimmune response to critical tumor-specific antigens defines a therapywith exquisite specificity and minimal toxicity. Second, immune-mediatedtumor destruction occurs by mechanisms distinct from those underlyingthe efficacy of chemotherapy and hormone therapy. Thus, immunotherapyoffers an approach to circumventing the intrinsic drugresistance that currently underlies therapeutic failure. Third, thephenomenon of immunologic memory endows immunotherapy withthe potential for creating a durable therapeutic effect that is reactivatedat the onset of disease relapse. Moreover, immunologic memory alsounderlies the potential future use of vaccines for the prevention ofbreast cancer. Early clinical trials have highlighted the promise ofbreast cancer vaccines, and have further defined the challenges facingtranslational scientists and clinical investigators. The judicious applicationof laboratory advances to clinical trial design should facilitatethe development of immunotherapy as an additional major therapeuticmodality for breast cancer, with the potential for breast cancer preventionas well as treatment.

The incidence of ovarian carcinoma increases with advancing age,peaking during the 7th decade of life and remaining elevated until age80 years. Despite the high prevalence of ovarian cancer in the elderly,the management of these patients is often less aggressive than that oftheir younger counterparts. As a result, many elderly cancer patientsreceive inadequate treatment. However, data do not support the conceptthat age, per se, is a negative prognostic factor. In fact, the majority ofelderly patients are able to tolerate the standard of care for ovariancancer including initial surgical cytoreduction followed by platinumand taxane chemotherapy. Because functional status has not demonstrateda reliable correlation with either tumor stage or comorbidity,each patient’s comorbidities should be assessed independently. Forelderly patients with significant medical comorbidity, the extent ofsurgery and aggressiveness of chemotherapy should be tailored to theextent of disease, symptoms, overall health, and life goals. In addition,enhanced cooperation between geriatricians and oncologists may assistthe pretreatment assessment of elderly patients and improve treatmentguidelines in this population.

As the population ages over thenext 50 years, the number ofcancer patients is expected todouble from the current 1.3 million to2.6 million, and the majority of thosepatients will be at least 75 years old.[1]Projected increases in life expectancyaccount for this change. For womenliving in industrialized countries, it isestimated that the average life span infuture decades will reach 90 years.[2]Most cancers increase in incidenceand mortality as a population ages,although the causal link between oncogenesisand senescence remainscomplex and elusive. Within the contextof an upsurge in cancer incidence,an analysis of the inequitable treatmentof older patients afflicted withcancer takes on an urgent need.

With the population aging,cancer in older persons isbecoming an increasinglycommon problem.[1] The benefit ofantineoplastic treatment may be diminishedand the risk enhanced byaging, due to a progressive reductionin life expectancy and in the functionalreserve of multiple organ systems.[2] To establish the most suitablecourse of action in individual cases,the practitioner needs to be able toaddress the following questions: Is thecancer going to compromise the survivalor the quality of life of the patient?Is the patient able to tolerate thepotential risk of cancer treatment?

Drs. Levine and Gemignanihave provided a comprehensivereview of the literatureregarding the management of patientswith hereditary breast/ovarian cancersyndrome. As noted, over 200,000new cases of breast cancer and 25,000new cases of ovarian cancer are estimatedfor 2003.[1] Only a small portionof these cases will be hereditary;however, these are the cases that maybenefit from preventive measures. Thepotential for risk-reducing strategiesin these patients has become a criticalissue over the past several years. Thisreview highlights the salient featuresof identifying “at-risk” patients, aswell as the benefits and limitations ofsurgical prophylaxis.

The ability to identify a womanwith a germ-line mutation inBRCA1 or BRCA2, throughclinical genetic testing, allows thatwoman’s physician to implement preventivestrategies that may spare herfrom developing breast or ovariancancer. Unfortunately, the most effectivestrategies currently are also themost drastic; namely, prophylacticmastectomy and/or prophylacticoophorectomy.

Drs. Levine and Gemignani havecomposed an excellent comprehensivereview of the issuessurrounding prophylactic surgeryin patients at high risk for breast andovarian cancer. Their article focuseson the role of BRCA1/2 mutations inthe risk of developing hereditary breastand ovarian cancer and the data supportingrisk reduction in mutation carriersundergoing prophylactic surgery.

The hereditary breast/ovarian cancer syndrome is responsible forapproximately 5% of all breast cancers and 10% of all ovarian cancers.Although this accounts for a small portion of these diseases, muchattention has been focused on this syndrome because of the abundanceof research in this area. The majority of the hereditary breast/ovariansyndrome can be attributed to germ-line mutations in the BRCA1 andBRCA2 genes. Reliable screening techniques for these mutations havebeen developed and are readily available in clinical practice. Forpatients who are thought to have the hereditary breast/ovarian cancersyndrome based on family history or genetic testing, options exist foreither intensive screening or prophylactic surgery. This review willdiscuss the mechanisms by which mutations in the BRCA genes lead tothe development of cancer, the limitations of currently available screeningtechniques, and the efficacy of prophylactic surgery. In general,prophylactic oophorectomy can be performed laparoscopically as anoutpatient procedure, carrying as its main drawback the associatedconsequence of surgical menopause. Prophylactic mastectomy is quiteeffective in reducing the risk of breast cancer but is a more extensivesurgical procedure and results in disfigurement. For any given patient,the best estimates of individual risk of breast or ovarian cancer shouldbe weighed against the benefits of prophylactic surgery and the patient’spersonal wishes.

BETHESDA, Maryland-New findings by proteomics researchers at the National Cancer Institute (NCI) and the Food and Drug Administration (FDA) have advanced efforts to enable physicians to monitor the response of cancer patients treated with molecularly targeted drugs and to diagnose ovarian cancer in the early stages of the disease.

NEW ORLEANS-With few exceptions, lymphadenectomy should be performed in ovarian cancer patients even if they have stage IA disease. This was the conclusion of French investigators who analyzed 276 women with epithelial ovarian cancer and reported their results at the 34th Annual Meeting of the Society of Gynecologic Oncologists (abstract 94).

NEW ORLEANS-The survival rate for patients with primary invasive epithelial ovarian cancer has steadily increased over the past 3 decades, despite rising diagnoses among African-American women and women over age 60, according to an analysis presented at the Society of Gynecologic Oncologists’ 34th annual meeting (abstract 3).

NEW YORK-Previously treated patients with ovarian cancer who received a novel glutathione (TLK286, Telik, Inc., San Francisco) have thus far survived a median of more than 56 weeks, according to preliminary results from an ongoing multicenter phase II trial. John J. Kavanagh, MD, presented the results at the Mount Sinai School of Medicine Chemotherapy Foundation Symposium XX.

Neurotoxicity is a well-describedside-effect of paclitaxeltherapy, often characterizedas a peripheral sensory neuropathy.Neuropathy is a dose-dependenteffect, occurring with cumulative cyclesand higher doses. Occasionally,this may be dose-limiting for patientswho are benefiting from treatment, aswell as problematic for subsequenttherapies. Another well-recognizedthough less-described neurotoxic effectof paclitaxel is myopathy. Myopathy,consisting of myalgias andarthralgias, can be at least as commonwith standard paclitaxel regimens andequally troubling for patients. In thisissue of ONCOLOGY, Garrison andcolleagues review paclitaxel-associatedmyopathy and offer suggestionsfor patient management.

Paclitaxel-induced myalgias and arthralgias occur in a significantfraction of patients receiving therapy with this taxane, potentiallyimpairing physical function and quality of life. Paclitaxel-inducedmyalgias and arthralgias are related to individual doses; associationswith the cumulative dose and infusion duration are less clear. Identificationof risk factors for myalgias and arthralgias could distinguisha group of patients at greater risk, leading to minimization of myalgiasand arthralgias through the use of preventive therapies. Optimalpharmacologic treatment and possibilities for the prevention of myalgiasand arthralgias associated with paclitaxel are unclear, partially dueto the small number of patients treated with any one medication. Theeffectiveness of nonsteroidal anti-inflammatory drugs (NSAIDs) is themost frequently documented pharmacologic intervention, although noclear choice exists for patients who fail to respond to NSAIDs. However,the increasing use of weekly paclitaxel could necessitate daily administrationof NSAIDs for myalgias and arthralgias and leave patients at riskfor adverse effects. This concern may also limit the use of corticosteroidsfor the prevention and treatment of paclitaxel-induced myalgias andarthralgias. Data from case reports suggest that gabapentin (Neurontin),glutamine, and, potentially, antihistamines (eg, fexofenadine [Allegra])could be used to treat and/or prevent myalgias and arthralgias. Giventhe safety profile of these medications, considerable enthusiasm existsfor evaluating their effectiveness in the prevention and treatment ofpaclitaxel myalgias and arthralgias, particularly in the setting ofweekly paclitaxel administration.

WASHINGTON-Marshall Edwards, Inc. has launched a multi-center phase II clinical trial of its anticancer drug phenoxodiol in women with recurrent ovarian and fallopian tube cancers who have failed other forms of chemotherapy.

NEW YORK-A phase II trial of ecteinascidin-743 (ET-743) is underway in Europe in ovarian cancer patients who have failed platinum/taxane regimens, Nicoletta Colombo, MD, of the European Institute of Oncology, Milan, reported at the Chemotherapy Foundation Symposium XX.

NEW YORK-A trial is being launched to explore whether lengthening the platinum-free interval will affect recurrent ovarian cancer outcomes, William P. McGuire, MD, medical director, oncology, Franklin Square Hospital Center, Baltimore, announced at the Mount Sinai School of Medicine Chemotherapy Foundation Symposium XX.

The Northwestern University Costs of Cancer Program consists ofa series of pilot studies that address the costs of cancer care. Theprogram is designed to serve as a template in preparation for undertakinga large-scale study of a nationally representative sample of cancerpatients-ie, in preparation for a cancer costs and services utilizationstudy in the future. In this article, we outline the theoretical frameworkassociated with a study of cancer costs and summarize findings fromour ongoing pilot studies in this area.

ROCKVILLE, Maryland-An independent advisory board has entered the debate over the safety and efficacy of hormonal replacement therapy (HRT) and recommended against the use of the estrogen/progestin combination in postmenopausal women as a preventive treatment for cardiovascular disease and other chronic conditions. It also concluded that insufficient evidence exists to support a recommendation for or against the use of estrogen alone for preventing chronic conditions in postmenopausal women who have undergone a hysterectomy.

In their excellent summary of randomized trials examining the management of cancers of the uterus and ovary, Kim and coauthors highlight a significant and worrisome difference that has developed between the two gynecologic malignancies over the past decade, with regard to the direction of clinical research involving chemotherapy. Although it is recognized that cytotoxic chemotherapy is employed in the majority of women with ovarian cancer at initial diagnosis, whereas such treatment is fortunately only required in a minority of individuals with endometrial cancer, it is unclear why there has been such a major divergence in the drugs and combination regimens currently being evaluated in clinical trials.

Historically, two-thirds of patients with endometrial carcinoma had disease confined to the uterus, and the cornerstone of treatment was total abdominal hysterectomy and bilateral salpingo-oophorectomy. Since the introduction of surgical staging in 1988, however, more patients are found to have disease outside the uterine cavity. Unfortunately, the current rules for staging are not followed by every practitioner, and the required specimens for pathologic examination are not always obtained. Therefore, recommendations for postoperative adjuvant therapy are usually based on the surgico-pathologic information available for each patient.