- 1 Definition/Description
- 2 Prevalence
- 3 Characteristics/Clinical Presentation
- 4 Associated Co-morbidities
- 5 Medications
- 6 Diagnostic Tests/Lab Tests/Lab Values
- 7 Etiology/Causes
- 8 Systemic Involvement
- 9 Medical Management
- 10 Physical Therapy Management
- 11 Differential Diagnosis
- 12 Case Reports/ Case Studies
- 13 Resources
- 14 References
Prostate cancer affects the prostate gland, which is part of the reproductive system and functions to create seminal fluid. Prostate cancer is the most common type of cancer in men after skin cancer, and is the second leading cancer related cause of death in men. It is slow growing and affects one third of all males by the age of 50. Prostate cancer commonly metastasizes, primarily spreading to bone, which frequently causes lumbar pain. Even with such a fairly high mortality and metastasis rate, the microscopic changes that occur in the prostate can be slow growing and may never cause health issues and often cause no signs or symptoms. Variations in the rate of prostate cancer progression and spreading suggests genetic involvement along with familial predisposition and diet. Overall, prostate cancer has become a significant issue due to the fact that it has become so prevalent. Overall, more men are being diagnosed due to an increase in routine screenings, and more men are living longer with the disease due advancements in treatment.
The American Cancer Society estimates that in 2016 the United States will have about 180,890 new cases of prostate cancer, and around 26,120 deaths due to the same disease. Approximately 1 in every 7 men will be diagnosed with prostate cancer. Prostate cancer is more common in African-American males compared to white or Hispanic males, and is least common in Asians and Native American men. It most commonly affects men over the age of 50 with an increasing incidence with age, and about 6 out of every 10 cases diagnosed are of men age 65 or older. It is rare in men under 45 years of age.
Death due to prostate cancer is currently about 1 in every 39 men. Even though the lifetime prevalence of being diagnosed with prostate cancer is high, most men will not die due to this disease process.
Characteristics/Clinical PresentationClinical Signs and Symptoms: 
- Urinary retention or other urinary complaints
- Low back pain, inner thigh or perineal pain or stiffness
- Blood in semen
- Suprapubic or pelvic pain/discomfort
- Sexual dysfunction
Early prostate cancer may be asymptomatic. Routine screenings of prostate cancer are commonly being done on asymptomatic men. The listed signs and symptoms may also be present with other prostate related disease processes such as Benign Prostatic Hyperplasia (BPH) or Prostatitis.
- Bone pain and lower extremity pain
- Lymphedema of groin or lower extremities
- Neurological changes from spinal cord compression
- Weight loss and loss of appetite
Associated signs and symptoms to ask the patient about include:
- Sudden moderate to high fever
- Changes in bowel or bladder function
A retrospective study by Chamie et al. titled “Comorbidities, Treatment and Ensuing Survival in Men with Prostate Cancer” looked at men diagnosed with prostate cancer and how comorbidities affected their mortality and treatment.
Survival differences corresponding to 5-year and 10-year survival rates were studied. “The respective 5-year and 10-year survival for those without any comorbid conditions were 88% and 75%; men with moderate-severe COPD were 50% and 12%; diabetes with end-organ damage were 57% and 36%.” So, just based off of this single study conducted it can be speculated that comorbidities such as, COPD and diabetes could factor into the mortality of those diagnosed with prostate cancer.
Also, some studies have shown that there is a lower risk of getting a less dangerous form of prostate cancer and an increased risk of getting a more advanced form of it in obese men. Some studies have also found that obesity may create a greater risk of dying from prostate cancer.
There are many medications that can be used in the treatment of prostate cancer. Pharmacotherapy is used in the treatment of prostate cancer in hopes to induce remission, reduce morbidity and reduce complications. A list of FDA approved drugs for the treatment of prostate cancer can be found at the National Cancer Institute: http://www.cancer.gov/about-cancer/treatment/drugs/prostate.
Some of the more common medications used for prostate cancer include:
- Hormone Therapy: used to stop the production of testosterone or to block uptake of testosterone by cancer cells
Gonadotropin-releasing hormone (GnRH) agonists: causes medical castration which reduces production of testosterone
Androgen antagonists: inhibits interaction with testosterone
- Bisphophonates: used in men with castrate-resistant cancer and with bone metastases
- Zoledronic acid
- Antifungal agents: works similar to antiandrogens and are used when antiandrogens fail
- Chemotherapeutic agents
- Corticosteroids: modifies the body's immune response
- Immunologic agents: stimulates patient's own immune system
Diagnostic Tests/Lab Tests/Lab Values
Prostate-specific Antigen (PSA) Test
- A blood test used to test for elevated levels of PSA, which occurs with any changes in the prostate.
- The risk of disease increases as the PSA level increases; however, a normal level of PDA has not been determined.
- If prostate cancer develops the PSA levels will typically increase past 4 ng/mL of blood, according to the American Cancer Society.
-PSA level between 4 and 10: 25% chance of having prostate cancer
-PSA greater than 10: over 50% chance of having prostate cancer
- No PSA level guarantees the absence of prostate cancer.
-Approximately 15% of men with a PSA below 4 will be positive for prostate cancer when biopsied3
- There are several factors that may increase PSA levels
The U.S. Preventive Services Task Force recommends against PSA-based screening for prostate cancer due to the test often producing false positives, which can then lead to harmful side effects from proceeding diagnostic tests or treatment. This recommendation is considered controversial and is currently in the process of being updated according to the U.S. Preventive Services Task Force website.
Digital Rectal Examination (DRE):
- A DRE is an exam in which the doctor inserts a finger into the rectum to allow the ability to palpate the back of the prostate gland, which allows for the ability to feel possible cancers or bumps
- Majority of patients diagnosed with prostate cancer have abnormal PSA levels, but normal DRE results
- This test may still be included in screening because even though it is less effective than a PSA blood test overall it may still be able to detect cancer in men that may demonstrate normal PSA levels
Prostate cancer often grows slowly; therefore, men without symptoms of prostate cancer who do not have a 10-year life expectancy may not be screened. Overall health status, not just age, is important when making decisions, and patients should talk to their healthcare provider about the pros and cons of being tested and treated for prostate cancer. 
Recommended age to start screening for prostate cancer according to the American Cancer Society:
- 50 years of age for men with an average risk, and who have at least a 10-year life expectancy
- 40-45 years of age for African American men and those with a first-degree relative diagnosed with prostate cancer before 65 years old
- 40 years of age for men with several first-degree relatives who had prostate cancer at an early age
- The diagnosis of prostate cancer is established via a biopsy of the prostate gland, and may be indicated for individuals who have elevated PSA levels.
- A small piece of the prostate gland is removed and examined under a microscope for cancer cells. If cancer cells are found then a Gleason score will be determined from the biopsy.
- A Gleason score indicates how likely the cancer is to spread. It ranges from 2–10, the lower the score the less likely it is that the cancer will spread
- False-negative results often occur; therefore, multiple biopsies may be done before prostate cancer can be detected and confirmed
- A small probe is inserted into the rectum and uses sound waves (ultrasound) to create a picture of the prostate.
- TRUS is not utilized as a screening tool because it cannot always differentiate between normal tissue and cancerous tissue. Instead, it is often used in conjunction when a prostate biopsy to help guide the biopsy needles into the right area of the prostate.
- TRUS can also be utilized to determine the PSA density and to tell which treatment choices are appropriate.
Stage I: Cancer cannot be felt during a DRE, but it may be found during surgery being done for another reason. The cancer has not yet spread to other areas.
Stage II: Cancer can be felt during a DRE or discovered during a biopsy. The cancer has not yet spread.
Stage III: The cancer has spread to nearby tissue
Stage IV: The cancer has spread to lymph nodes or to other parts of the body
The cause of prostate cancer is not yet known; however, there are several known risk factors that have been shown to indicate an increase in the risk of developing this type of cancer.
Non Modifiable Risk Factors
- Advancing Age
- Most men who acquire prostate cancer are 65 years or older
- It is very rare to develop prostate cancer before 45 years of age
- Prostate cancer occurs more frequently in North America, northwestern Europe, Australia, and on the Caribbean islands, and it is less common in Asia, Africa, Central America, and South America.
- Family History
- There is an increased risk of developing prostate cancer if a brother or father had the disease, and the risk increases the more first degree relatives that have been affected.
- Gene Mutations
- A study performed showed a possible correlation between elevated levels of luteinizing hormone and of testosterone:dihydrotestosterone and a mild increase in risk of prostate cancer
- A diet high in animal fat, red meat, and high-fat dairy products may be attributed to an increase risk in developing prostate cancer.
- Occupational exposures
- Such as chemicals (herbicides, pesticides, and toxic combustible products), cadmium, and other metals
- Multiple sex partners
- Low levels of vitamins or selenium
Early prostate cancer is often asymptomatic and is often diagnosed because men seek medical attention for issues regarding urinary dysfunction (i.e. retention) or low back, hip, or leg pain. Prostate cancer almost exclusively metastasizes to bone of the pelvis, spine, or femur via the bloodstream or lymphatic system and spreads in the early stages. It has also been known to spread to the bladder, rectum, and distant organs such as the liver, lung, and brain via the lymphatics.
- Prostatectomy: This involves the removal of the prostate gland. A radical prostatectomy is the removal of the prostate gland and some surrounding tissue. 
- Radiation therapy: Use of high-energy radiation to try to kill the cancer cells.
1. External beam radiation therapy: the radiation is directed into the cancer cells from the outside of the body
2. Brachytherapy (Internal radiation therapy): Radioactive pellets surgically implanted into the cancerous area to try to kill the cells from the inside of the body
- Active surveillance: Monitoring the cancer by regularly performing PSA tests and DRE tests, and taking action only if the cancer or symptoms increase
- Hormone therapy: Aims to block the cancer cells from obtaining the essential hormones needed to grow
- Cryotherapy: Treatment includes placing a probe near the cancer cells to try to kill them by freezing them
- Chemotherapy: Use of drugs (oral or intravenous) to try to kill or reduce in size the cancer cells
- Vaccine treatment: Cancer vaccine made specifically for each man that works to boost the body’s immune system to kill prostate cancer cells. This is mainly used for advanced cancers that are not responding to hormone therapy.
Metastatic prostate cancer
Rarely can prostate cancer that has metastasized be cured. Management of these patients usually include such treatments as:
- Preventing and treating cancer spread to bones via medications (i.e. Biphosphonates, Denosumab, etc.)
- Relief of particular symptoms (i.e. relieving bone pain via pain medication)
- Trying to slow further progression of disease
Physical Therapy Management
In a retrospective study by Alappattu et al. titled "Clinical Characteristics of Patients With Cancer Referred for Outpatient Physical Therapy" outlined common impairments seen post cancer treatment and how physical therapy can help treat these impairments.
There were 418 patients examined in this study, 169 (40.4%) of which were referred for having genitourinary cancer. 80% of the patients in the genitourinary classification had a diagnosis of prostate cancer. Some of the common impairments found with all cancer types after examination included cancer-related fatigue, deconditioning, pain, muscle shortening, contractures, peripheral neuropathy, lymphedema and genitourinary dysfunction.
The most common neuromusculoskeletal impairments found with genitourinary cancer included:
- Strength (88.2%)
- Incontinence (81.7%)
- Urgency (75.8%)
- Soft tissue (59.5%)
- Pain (25.5%)
Pelvic Floor Muscle Training
Physical therapists working with individuals post-prostate cancer treatment or individuals with a history of prostate cancer should always screen for genitourinary dysfunction as incontinence and erectile dysfunction may remain for a period of time after cancer treatment. The physical therapist should treat or refer appropriately.
Pelvic floor muscle training (PFMT) is the mainstay of conservative treatment and is intended to improve urinary control by increasing the strength, endurance, and coordination of the pelvic floor muscles. Parekh et al. evaluated continence outcomes in patients who received 3 pre-prostatectomy pelvic-floor muscle training sessions and 3 post-operative pelvic-floor muscle training sessions. Gomes et al. assessed the effect of pilates and pelvic floor muscle training with electrical stimulation on urinary incontinence post-prostatectomy and found improvements in both groups compared to the controls. However, the results for the effectiveness of PFTM for incontinence are not conclusive for its long term effects. A systematic and meta-anaylsis examining the effect of preoperative PFMT on postoperative urinary incontinence following radical prostatectomy, found that preoperative PFMT improves postoperative urinary incontinence at 3 months but not at 6 months, suggesting it improves early continence but not long-term continence rates.
Erectile dysfunction has a negative effect on the quality of life of men and their sexual partners. The main cause of erectile dysfunction after a radical prostatectomy is neurogenic, because of intraoperative injury to the neurovascular bundle. A prospective, randomized, controlled trial conducted by Prota et al. compared early postoperative biofeedback pelvic-floor biofeedback training (PFBT) to usual care and found early PFBT appears to have a significant impact on the recovery of erectile dysfunction. Other studies have found similar results.
The method used by Prota et al. is as follows:
- an electromyographic apparatus was used, a surface electrode (3M, Sumare, Brazil) was inserted into the anus and the reference electrode was placed on the left lateral malleolus
- patients practiced 3 series of 10 rapid contractions while lying on their right side and viewing a computer monitor to improve the phasic musculature component
- then patients practiced 3 sustained contractions of 5, 7 or 10 s depending on ability to maintain the contraction of pelvic-floor muscle tonic component
- patients were then placed in the supine position, with hips flexed to approximately 60 °, to practice 10 contractions during prolonged expiration, avoiding the Valsalva maneuver
- Verbal and written instructions were used to conduct daily home exercises while lying, sitting and standing
In addition to the treatments discussed above, it is important to treat the patient as a whole, which includes targeted aerobic training and strengthening exercises for prevention and management of cancer related fatigue exhibits efficacy when used during and after treatment in various types of cancer according to some studies.
- Obstruction of lower urinary tract
- Acute Bacterial Prostatitis and Prostatic abscess
- Bacterial prostatitis
- Benign Prostatic Hyperplasia
- Tuberculosis of Genitourinary System
- Musculoskeletal: Low back, hip, or leg pain
Although bony metastases of prostate cancer are often blastic as found by radiologic imaging, they can cause lytic lesions which may mimic Paget's disease. Some bony metastases may cause a pathologic fracture which is a common symptom of Paget's disease. In men being treated with luteinizing hormone-releasing hormone (LHRH), osteoporotic fractures must be differentiated from pathologic fractures.
Any sudden neurologic changes of the lower extremities such has weakness in older men with a history of prostate cancer should raise awareness of possible spinal cord compression and should be sent for emergency treatment. Brain metatsases with associted neurological symptoms are rare, but should be considered when screening older men with a history of prostate cancer.
Pelvic masses and bone lesions are presentations of lymphoma and are very rare when in association with prostate cancer. Cases of lymphomas with prostate cancer have been reported and should be taken into consideration while screening.
Case Reports/ Case Studies
1. Glode, LM. Case Reports on Prostate Cancer. Reviews in Urology 2004;6(Suppl 7):S39-S45. Published 2004. Available from: PMC.http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1472886/
2. Kubicka-Wolkowska J, Debska-Szmich S, Lisik-Habib M, Noweta M, Potemski P. Malignan acanthosis nigricans associated with prostate cancer: a case report. BMC Urology. 2014;14:88. Published November 2014. Available from: PMC http://www.ncbi.nlm.nih.gov/pubmed/25399333
3. Bourlon M, Glode L, Crawford E. Base of the Skull Metastases in Metastatic Castration-Resistant Prostate Cancer. Oncology Journal. December 2014. Available from: Cancer network. http://www.cancernetwork.com/oncology-journal/base-skull-metastases-metastatic-castration-resistant-prostate-cancer
4. Aksoy S, Orhan K, Kursun S, Eray Kolsuz M, Celikten B. Metastasis of prostate carcinoma in the mandible manifesting as numb chin syndrome. World Journal of Surgical Oncology. 2014;12:401. Published December 2014. Available from: PMC. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4326431/
American Cancer Society
Toll-free number: 1-800-227-2345
Prostate Cancer Foundation (formerly CaPCURE)
Toll-free number: 1-800-757-2873 (1-800-757-CURE) or 1-310-570-4700
US Too International, Inc.
Toll-free number: 1-800-808-7866 (1-800-80-US-TOO)
Urology Care Foundation
Toll-free number: 1-800-828-7866
National Association for Continence
Toll-free number: 1-800-252-3337 (1-800-BLADDER)
National Cancer Institute
Toll-free number: 1-800-422-6237 (1-800-4-CANCER); TYY: 1-800-332-8615
National Coalition for Cancer Survivorship
Toll-free number: 1-888-650-9127
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