Genitourinary Cancers

ASCO--An oral drug that blocks enzymes that appear to be fundamental for tumor spread significantly slowed the rate of rise of PSA in men with advanced hormone-refractory prostate cancer and may have the potential to increase survival, Peter Boasberg, MD, reported at the ASCO meeting.

The American Urological Association (AUA) recently urged Congress to pass the Medicare Preventive Benefit Improvement Act of 1997, which would provide coverage for annual prostate cancer screening for Medicare-eligible men over the age of

Men whose metastatic prostate cancer is maintained in remission by complete hormonal therapy (CHT) with flutamide (Eulexin) and a luteinizing-hormone-releasing hormone (LHRH) agonist have a health-related quality of life (QOL) equal to

FORT LAUDERDALE, Fla--The key feature of prostate cancer that distinguishes it from most other solid tumors is the large discrepancy between annual incidence (about 250,000) and mortality (about 41,000).

Dr. Powell has written a comprehensive review of factors believed to contribute to the racial differences observed for prostate cancer incidence and mortality. Prostate cancer has a greater negative impact on African-Americans than on any other racial or ethnic group. However, the etiology of the striking racial variation in prostate cancer incidence and mortality remains enigmatic.

This paper is a very nice review of the history of the development of modern urologic surgical procedures for the treatment of testicular germ-cell tumors and their current indications. I agree with virtually everything the authors say. I will emphasize several points that they make and highlight a few small areas of disagreement.

Dr. Powell is to be congratulated for an outstanding review article on prostate cancer in African-American men. As he points out, the age-adjusted incidence of prostate cancer in African-American (black) males is 50% higher than that in Caucasian (white) men, and black men have the highest incidence of prostate cancer in the world.[1] Differences between blacks and whites in the probability of being diagnosed with prostate cancer (9.6% vs 5.2%), lifetime prostate cancer-specific mortality (3% vs 1.4%), and 5-year survival (65% vs 78%) are all indicative of a major public health problem in the black male population.[2]

The article by Drs. Steele and Richie is a well-written, extremely important review of the natural history, treatment options, and current role of surgery in the management of nonseminomatous germ cell tumors of the testis. The authors present their rationale for retroperitoneal lymph node dissection (RPLND) in a thoughtful and provocative way. Their philosophy mimics that practiced at the University of Southern California (USC), which is very similar to that espoused by Drs. John Donohue and Larry Einhorn, who pioneered the current management practices that have made germ cell testicular tumors the most curable solid tumor in humans.[1,2]

The article by Powell highlights uncertainties about the relative contributions of diagnostic delay and tumor biology to racial disparities in stage at diagnosis among American men with prostate cancer, and explores a variety of factors that may discourage early cancer detection in African-American men. Observations derived from our ongoing prospective studies of prostate cancer diagnosis and treatment outcomes in black and white American veterans and from our experience with prostate cancer screening at the University of Mississippi Hospital and Clinics afford additional insights into these issues and provide a framework for this commentary.

Carcinoma of the testis is the most common malignancy in males 15 to 35 years of age. Testicular cancer has become one of the most curable solid neoplasms and, as such, serves as a paradigm for the multimodality treatment of malignancies. The cure rate for patients with clinical stage I disease is nearly 100%, and patients with advanced disease now achieve complete remission rates of over 90%. The markedly improved outlook for patients with this cancer over the past 15 years has led to a reassessment of management options, especially in patients with clinical stage I disease. The realization that platinum-based chemotherapy could cure most patients with an advanced nonseminomatous germ cell tumor (NSGCT), especially those with minimal disease, led to the introduction of various strategies to decrease the morbidity associated with surgical management. These strategies include surveillance protocols, chemotherapy for clinical stage II disease, and observation protocols for a subset of patients with advanced disease who have had a partial response to chemotherapy. Retroperitoneal lymph node dissection (RPLND) has an important place in the management of both low- and high-stage testicular cancer. It offers the patient two basic benefits: accurate staging and the possibility of a surgical cure, even in the presence of metastatic disease. [ONCOLOGY 11(5):717-729, 1997]

Mortality from prostate cancer is two to three times greater among African-American men between the ages of 50 and 70 than among American Caucasian men of similar ages. Also, African-Americans tend to present with more advanced tumors than their American Caucasian counterparts. This article explores differences between the two races that may account for the disproportionately high mortality among African-Americans and their more advanced disease stage at presentation. These include epidemiologic and histologic features of prostate cancer; clinical, biologic, and environmental factors; and barriers to health care. Various important issues that warrant further investigation are also highlighted. [ONCOLOGY 11(5):599-605, 1997]

Progress in managing testicular cancer over the last 2 decades has produced survival rates of well over 90% using a multidisciplinary approach that serves as a model for other tumors. Improved imaging techniques permit more accurate clinical staging, allowing the clinician to select, for each patient, the sequence of surgical and chemotherapeutic modalities that maximizes survival while keeping morbidity within tolerable limits. Current investigators are attempting to refine treatment protocols so as to maintain or improve survival while reducing morbidity and costs.

In a lively session featured at the 32nd Annual Meeting of the American Society of Clinical Oncology (ASCO), Jerome P. Richie, md, Brigham and Women's Hospital, Boston, and Steven H. Woolf, md, mph, Medical College of Virginia,

Dr. DeAntoni has carefully reviewed the literature on age-specific reference ranges for prostate-specific antigen (PSA) in the diagnosis of prostate cancer and the controversy surrounding their use. Key to understanding of this debate are two fundamental concepts: (1) the definition of "clinically significant prostate cancer" and (2) the use of sensitivity and specificity, which is frequently obscured by the surrounding rhetoric. The assumption that all readers uniformly interpret the meaning of clinically significant prostate cancer and wish to achieve the same results by manipulating sensitivity and specificity is probably incorrect.

PSA is the best tumor marker yet discovered. Age-specific reference ranges could improve the sensitivity of PSA by detecting curable, organ-confined tumors.

Controversy exists over the optimal management of patients with an asymptomatic rising prostate-specific antigen (PSA) following definitive therapy for clinically localized prostate adenocarcinoma.

Dr. DeAntoni provides a timely, critical review of the concept of age-specific prostate-specific antigen (PSA) ranges, as well as other frequently used attempts to improve the accuracy of serum PSA testing in the diagnosis of unsuspected prostate cancer. His review is complete, and his assessments of each of the modalities reflect not only the majority view but also realistic appraisals of the limitations of this less-than-perfect test.

CHICAGO--Because of its high cost and lack of universal availability, magnetic resonance imaging (MRI) has not been a prominent tool in the initial evaluation of prostate cancer. However, MRI is proving to be a highly accurate method of identifying local recurrence of prostate cancer after radical prostatec-tomy, Jeffrey M. Silverman, MD, said at the Radiological Society of North America (RSNA) annual meeting.

In a lively session featured at the 32nd Annual Meeting of the American Society of Clinical Oncology (ASCO), Jerome P. Richie, MD, Brigham and Women's Hospital, Boston, and Steven H. Woolf, MD, MPH, Medical College of Virginia,

We read with interest the recent practice guidelines on prostate cancer published by the National Comprehensive Cancer Network (NCCN) in a supplement to the November 1996 issue of ONCOLOGY (pp 265-288). The establishment of such

Researchers at Columbia-Presbyterian Medical Center have identified a gene that may control the metastatic spread of prostate cancer and tumor growth. If confirmed, the preliminary findings may eventually help doctors identify patients whose

Improved diagnostic techniques for prostate cancer, the most common cancer among American men, have led to a threefold increase in the rate of diagnosis since 1988. But that presents physicians with a dilemma: Many of these early cancers are

WASHINGTON--An international team of researchers has mapped a major gene that predisposes men to prostate cancer to the long arm of chromosome 1, finally resolving the question of whether genes for this cancer actually exist. Dubbed HPC-1, for hereditary prostate cancer 1, the gene appears to account for about 3% of the 340,000 prostate cancers diagnosed annually in the United States.

ROCKVILLE, Md--TICE BCG vaccine (Organon Teknika Corp.) has won the backing of the Food and Drug Administration's Oncologic Drugs Advisory Committee (ODAC) as a prophylaxis against recurrent papillary carcinoma of the urinary bladder.

In a lively session at the 32nd Annual Meeting of the American Society of Clinical Oncology (ASCO), Jerome P. Ritchie, MD, Brigham and Women's Hospital, Boston, and Steven H. Woolf, MD, MPH, Medical College of Virginia,

After increasing sharply from 1989 through 1992, US prostate cancer incidence rates dropped by 16% for white men and nearly stabilized for African-American men (2% increase) in the latest period available for analysis, 1992 to 1993. These findings, based on the National Cancer Institute's Surveillance, Epidemiology, and End Results (SEER) cancer registry information and US Census population estimates, are reported in the November 20th issue of the Journal of the National Cancer Institute.

ROCKVILLE, Md--The FDA has approved a new indication for Novan-trone (mitoxantrone), making it the first chemotherapy agent approved for the treatment of advanced hormone-refractory prostate cancer. Novantrone in combination with corticosteroids has been shown to reduce bone pain and stabilize or reduce reliance on analgesics in these patients without adversely affecting quality of life.

LOS ANGELES--"Prostate cancer is a disease of options," Douglas Keyser, MD, said at the American Society for Therapeutic Radiology and Oncology (ASTRO) meeting. And individual treatment decisions are difficult to make because of the lack of randomized studies and head-to-head comparisons between radiation therapy and surgery.

Superficial bladder cancer can be a frustrating disease for both the patient and physician. It has been referred to as a "nuisance disease" because of its propensity for recurrence, necessitating frequent cystoscopies and trips to the operating room for resection of recurrent disease. In addition, however, there looms for the patient and physician the 10% to 15% probability of disease progression, often requiring cystectomy to achieve local control and placing the patient at much greater risk for disease mortality. The challenge is to predict which patients will benefit from adjuvant therapy in order to avoid disease progression and, secondarily, disease recurrence.

Dr. Grossman's article provides a well-organized review of the literature on the treatment of superficial bladder cancer. At the time of diagnosis, approximately 80% of patients with bladder cancer have superficial tumors (limited to the urothelial lining of the bladder or the underlying lamina propria). In such patients, the risk of distant disease is low, and the natural history of bladder cancer is based on two separate, but related processes: tumor recurrence and progression to a higher stage of disease.