Testicular Cancer Screening (PDQ®): Screening - Health Professional Information [NCI]
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Testicular Cancer Screening
Purpose of This PDQ Summary
This PDQ cancer information summary for health professionals provides comprehensive, peer-reviewed, evidence-based information about testicular cancer screening. This summary is reviewed regularly and updated as necessary by the PDQ Screening and Prevention Editorial Board.
Information about the following is included in this summary:
- Testicular cancer incidence and mortality statistics and information about testicular cancer risk factors.
- Benefits and harms of testicular cancer screening.
This summary is intended as a resource to inform clinicians and other health professionals about testicular cancer screening. The PDQ Screening and Prevention Editorial Board uses a formal evidence ranking system in reporting the evidence of benefit and potential harms associated with screening. It does not provide formal guidelines or recommendations for making health care decisions. Information in this summary should not be used as a basis for reimbursement determinations.
This summary is also available in a patient version, which is written in less technical language.
Summary of Evidence
Note: Separate PDQ summaries on Testicular Cancer Treatment and Levels of Evidence for Cancer Screening and Prevention Studies are also available.
Based on fair evidence, screening for testicular cancer would not result in an appreciable decrease in mortality, in part because therapy at each stage is so effective.
Based on fair evidence, screening for testicular cancer would result in unnecessary diagnostic procedures with attendant morbidity.
Description of the Evidence
- STUDY DESIGN: Opinions of respected authorities based on clinical experience, descriptive studies, or reports of expert committees.
- INTERNAL VALIDITY: Not applicable.
- CONSISTENCY: Not applicable.
- DIRECTION AND MAGNITUDE OF EFFECT: Fair evidence of no reduction in mortality; good evidence for rare but serious harms.
Incidence and Mortality
It is estimated that 8,400 new cases of testicular cancer will be diagnosed in men, and 380 men will die of this disease in the United States in 2009. Testicular cancer is the most common malignancy in men aged 15 to 35 years. It accounts for approximately 1% of all cancers in men. Worldwide, testicular cancer has more than doubled in the last 40 years. Incidence varies considerably in different geographical areas, being highest in Scandinavia and Switzerland; intermediate in the United States, Australia, and the United Kingdom; and lowest in Asia and Africa. It also varies according to ethnic groups, with a much higher rate among whites than blacks in the American population. An annual increase of 3% is reported for Caucasian populations. Despite the increase in observed incidence, there has been a dramatic decrease in mortality as a result of effective treatments.
Germ cell tumors (GCT) of the testis constitute 94% of testicular tumors and include five basic cell types: seminoma, embryonal carcinoma, yolk sac tumor, teratoma, and choriocarcinoma. Sixty percent of GCT are seminomas; the remainder are nonseminomatous germ cell tumors. Almost half of all germ cell tumors contain more than one of the five cell types.
Three subtypes of pure seminomas have been described: classic, anaplastic, and spermatocytic. Classic seminoma accounts for 80% to 85% of all seminomas and occurs most commonly in men aged 30 to 50 years. Anaplastic seminoma accounts for 5% to 10% of all seminomas and has an age distribution similar to that of the typical subtype. A number of features suggest that anaplastic seminoma is a more aggressive and potentially more lethal variant of typical seminoma. These characteristics include greater mitotic activity, higher rate of local invasion, increased rate of metastatic spread, and higher rate of tumor marker (human chorionic gonadotropin beta, or beta hCG) production. Spermatocytic seminoma accounts for 2% to 12% of all seminomas, and nearly half occur in men older than 50 years. The cells closely resemble different phases of maturing spermatogonia. The metastatic potential of this tumor is extremely low, and the prognosis is favorable.
Unlike most other cancers, testicular cancer is generally found in young men. In white men, testicular cancer is the most common cancer from age 20 years to age 34 years, the second most common from age 35 years to age 39 years, and the third most common from age 15 years to age 19 years. This type of cancer is 4.5 times more common among white men than black men, with intermediate incidence rates for Hispanics, American Indians, and Asians. High-risk groups exist. Males with cryptorchidism have 3 to 17 times the average risk. Approximately 7% to 10% of patients with testicular tumors have a history of cryptorchidism.[4,7] Orchiopexy may not prevent cancer in these children but allows clinical surveillance of patients with a previously impalpable gonad. There is also an increased risk in males with gonadal dysgenesis and Klinefelter syndrome. Men with a family history of testicular cancer may be at a higher risk of this disease. A history of testicular cancer is associated with a higher risk of a contralateral tumor.[4,7]
Although not consistently found to confer a higher risk, infertility, testicular atrophy, twinship, or abnormal semen parameters have been associated with a higher risk of testis cancer, but the evidence is weak.[7,10]
An additional risk factor for the development of testicular cancer is the presence of carcinoma in situ (CIS), also called intratubular germ cell neoplasia. Testicular CIS appears to develop from fetal gonocytes and is characterized histologically by seminiferous tubules containing only Sertoli cells and malignant-appearing germ cells.
If encountered in the contralateral testis, CIS is associated with the development of contralateral testicular cancer in 50% of patients at 5 years of follow-up. CIS will be found in approximately 5% of contralateral testes (approximately the same rate as cryptorchid testes).
Approximately 60% of testicular cancers are localized, 24% are regional, and 14% are distant stage at diagnosis. Although there has been no appreciable change in the stage distribution at diagnosis, advances in treatment have been associated with a 60% decrease in mortality. Testicular cancer is so curable even at advanced stages and there are so few cases that it would be virtually impossible to document a decrease in mortality associated with screening.
Treatment options for CIS include observation, radiation therapy, chemotherapy, and orchiectomy. Although low-dose radiation therapy can preserve Leydig cell function and prevent germ-cell tumor development, a conservative approach of observation may also be warranted. Individuals at high risk (e.g., cryptorchidism, atrophic testis, and intersex conditions) require close observation.
Testicular cancer survivors are at an increased risk of solid tumors for at least 35 years after treatment.
There is a low cumulative risk of metachronous contralateral testicular cancer and a favorable overall survival of patients diagnosed with metachronous contralateral testicular cancer.
Evidence of Benefit
Most testicular cancers are first detected by the patient, either unintentionally or by self-examination. Some are discovered by routine physical examination. However, no studies have been done to determine the effectiveness of testicular self-examination or clinical testicular examination in reducing mortality from testicular cancer. The benefit of testicular self-examination is unknown.
Screening would be very unlikely to decrease mortality substantially because therapy is so effective, even for advanced stages of disease. However, early detection may have a practical impact on therapy. There is an increase in both the number of courses of chemotherapy and the extent of surgery required for treatment of advanced disease that results in higher morbidity. Patients diagnosed with localized disease require less treatment and have lower morbidity.
|1.||Sagalowsky AI: Expectant management of stage A nonseminomatous testicular tumors. In: Ratiff TL, Catalona WJ, eds.: Genitourinary Cancer. Boston: Martinus Nijhoff, 1987, pp 225-237.|
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Changes To This Summary (06 / 30 / 2009)
The PDQ cancer information summaries are reviewed regularly and updated as new information becomes available. This section describes the latest changes made to this summary as of the date above.
Updated incidence and mortality estimates for 2009 (cited American Cancer Society as reference 1).
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Date Last Modified: 2009-06-30