Medically Reviewed and Compiled by Dr. Adam N. Khan, MD.
Introduction
What is prostate cancer? Prostate cancer is a disease that starts in the prostate gland. The prostate is a small gland in men, about the size of a walnut. It sits below the bladder and in front of the rectum. Its main job is to help make semen, the fluid that carrie
Medically Reviewed and Compiled by Dr. Adam N. Khan, MD.
Introduction
What is prostate cancer? Prostate cancer is a disease that starts in the prostate gland. The prostate is a small gland in men, about the size of a walnut. It sits below the bladder and in front of the rectum. Its main job is to help make semen, the fluid that carries sperm.
Prostate cancer happens when cells in the prostate begin to grow out of control. Some prostate cancers grow slowly and may never cause serious harm. Others grow faster and can spread to other parts of the body.
Understanding what is prostate cancer helps men make informed decisions about screening, diagnosis, and treatment.
What Is the Prostate and What Does It Do?
The prostate is part of the male reproductive system. It surrounds part of the urethra, the tube that carries urine out of the body.
Main functions of the prostate:
- Produces fluid that nourishes and transports sperm
- Helps control urine flow
- Plays a role in ejaculation
Because the prostate surrounds the urethra, problems in this gland can affect urination.
What Is Prostate Cancer?
Prostate cancer begins when normal prostate cells change (mutate) and grow uncontrollably. These abnormal cells may form a tumor.
Most prostate cancers are:
- Adenocarcinomas (start in gland cells)
- Slow-growing in many cases
- Often found before symptoms appear
However, some forms are aggressive and spread quickly to:
- Bones
- Lymph nodes
- Liver
- Lungs
According to the American Cancer Society, prostate cancer is one of the most common cancers in men in the United States.
Causes and Risk Factors
The exact cause of prostate cancer is not fully known. However, research shows that certain risk factors increase the chance of developing it.
1. Age
Risk increases after age 50. Most cases are diagnosed in men over 65.
2. Family History
Men with a father or brother who had prostate cancer have a higher risk.
3. Genetic Mutations
Inherited mutations in genes like BRCA1 and BRCA2 may increase risk.
4. Race and Ethnicity
African American men have a higher risk and often develop more aggressive forms.
5. Diet and Lifestyle
High-fat diets and obesity may increase risk, though research is ongoing.
The National Cancer Institute confirms age and family history as major risk factors.
Symptoms of Prostate Cancer
Early prostate cancer often causes no symptoms.
When symptoms appear, they may include:
- Trouble starting or stopping urine
- Weak urine stream
- Frequent urination, especially at night
- Blood in urine or semen
- Erectile dysfunction
- Pain in hips, back, or chest (if cancer spreads)
These symptoms can also be caused by non-cancer conditions such as benign prostatic hyperplasia (BPH).
The Centers for Disease Control and Prevention notes that many men do not have symptoms in early stages.
How Prostate Cancer Is Diagnosed
Doctors use several tests to diagnose prostate cancer.
PSA Test (Prostate-Specific Antigen)
A blood test that measures PSA levels. High PSA may indicate cancer but can also be caused by other conditions.
Digital Rectal Exam (DRE)
The doctor feels the prostate through the rectum to check for lumps or irregular areas.
Prostate Biopsy
If PSA or DRE results are abnormal, a biopsy is done. Small tissue samples are examined under a microscope.
Imaging Tests
- MRI
- CT scan
- Bone scan
The Mayo Clinic explains that biopsy is the only way to confirm prostate cancer.
Stages of Prostate Cancer
Doctors stage prostate cancer to understand how far it has spread.
Stage I
Cancer is small and only in the prostate.
Stage II
Cancer is still in the prostate but may be larger.
Stage III
Cancer has spread outside the prostate to nearby tissues.
Stage IV
Cancer has spread to distant parts of the body.
The National Comprehensive Cancer Network provides detailed staging and treatment guidelines.
Treatment Options
Treatment depends on:
- Stage
- PSA level
- Gleason score
- Patient age
- Overall health
1. Active Surveillance
For slow-growing cancer. Doctors monitor closely without immediate treatment.
2. Surgery (Radical Prostatectomy)
Removal of the prostate gland.
3. Radiation Therapy
Uses high-energy rays to kill cancer cells.
4. Hormone Therapy
Reduces testosterone levels to slow cancer growth.
5. Chemotherapy
Used for advanced cancer.
6. Targeted Therapy and Immunotherapy
Used in specific advanced cases.
The American Urological Association supports shared decision-making between doctor and patient.
Unique Clinical Takeaways
1. PSA Is Not Cancer-Specific
PSA levels can rise due to:
- Infection
- Prostate enlargement
- Recent ejaculation
A single high PSA does not mean cancer. Trends over time (PSA velocity) often provide more useful information. Over-testing can lead to unnecessary biopsies.
Clinical insight: A rising PSA with a normal MRI may require repeat testing rather than immediate biopsy.
2. Not All Prostate Cancer Needs Immediate Treatment
Many men diagnosed with low-risk prostate cancer may never experience symptoms. Overtreatment can cause:
- Urinary incontinence
- Erectile dysfunction
- Emotional stress
Active surveillance reduces unnecessary side effects while maintaining safety.
Patient-centered perspective: Anxiety often drives treatment decisions more than medical need. Education reduces fear-based choices.
3. Bone Pain Is a Red Flag in Advanced Disease
Prostate cancer commonly spreads to bones.
Symptoms may include:
- Persistent back pain
- Hip pain
- Fractures
Bone metastasis may occur even when urinary symptoms are mild.
Clinical insight: New bone pain in a patient with known prostate cancer requires immediate evaluation.
4. Differential Diagnosis Is Critical
Symptoms of prostate cancer overlap with:
- Benign Prostatic Hyperplasia (BPH)
- Prostatitis
- Urinary tract infections
Misdiagnosis can delay proper treatment.
Complex perspective: Imaging with multiparametric MRI improves diagnostic accuracy and reduces unnecessary biopsies.
Survival Rates and Outlook
Survival depends on stage at diagnosis.
According to the American Cancer Society:
- Localized prostate cancer has a very high 5-year survival rate.
- Advanced metastatic cancer has lower survival rates.
Early detection improves outcomes significantly.
Can Prostate Cancer Be Prevented?
There is no guaranteed way to prevent prostate cancer.
However, research suggests:
- Maintain healthy weight
- Exercise regularly
- Eat fruits and vegetables
- Limit red meat
The Harvard Medical School supports lifestyle modification for overall prostate health.
When to See a Doctor
Men should talk to a healthcare provider if they:
- Are over 50
- Have family history
- Experience urinary changes
- Notice bone pain
Screening decisions should be individualized.
References and Citations
The following authoritative institutions support the information in this article:
- American Cancer Society – Prostate Cancer Overview and Survival Statistics
- National Cancer Institute – Prostate Cancer Risk Factors and Treatment Options
- Centers for Disease Control and Prevention – Prostate Cancer Basics and Symptoms
- Mayo Clinic – Diagnosis and Testing Guidelines
- National Comprehensive Cancer Network – Clinical Practice Guidelines in Oncology
- American Urological Association – Screening and Management Recommendations
- Harvard Medical School – Lifestyle and Prostate Health Research
Medical Disclaimer
This content is for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a licensed healthcare provider regarding any medical concerns.