Understanding Prostate Cancer: Causes, Risks, Diagnosis, and Treatment

Understanding Prostate Cancer: Causes, Risks, Diagnosis, and Treatment


What is Prostate Cancer?

Prostate cancer develops in the prostate, an important part of the male reproductive system. The prostate gland lies below the bladder, surrounds the urethra, and is in front of the rectum. The prostate gland secretes fluid that mixes with semen during ejaculation.

Prostate cancer, besides skin cancer, is the most common cancer in American men. According to the American Cancer Society, about one man in eight has been estimated to be diagnosed with prostate during his lifetime, and it is more common in older men and non-Hispanic Black men.

Benign Growth and Cancerous Growth of Prostrate

The benign and cancerous growth of the prostate are two distinct conditions with varying implications for health. Benign prostatic hyperplasia (BPH) is an enlargement of the prostate gland commonly occurring in older men and is non-cancerous. It is primarily due to hormonal changes and typically results in urinary symptoms such as increased frequency and urgency. BPH, while it can be uncomfortable, is not life-threatening.

In contrast, prostate cancer is the uncontrolled growth of malignant cells within the prostate gland. Unlike BPH, it can be life-threatening, especially if it spreads to other parts of the body. Diagnosis involves a combination of digital rectal exams, PSA tests, and biopsies. Treatment options for prostate cancer may include surgery, radiation therapy, hormone therapy, or chemotherapy. Distinguishing between these conditions is crucial, and a proper diagnosis is essential to determine the appropriate course of action.

Risk Factors of Prostate Cancer

The most common risk factors of prostate cancer include:

Risk factors for prostate cancer

  1. Age: Your risk of prostate cancer increases significantly with age. It is relatively rare in men under 40 but becomes more common as they age. The majority of cases are men over the age of 65.
  2. Family History: A family history of prostate cancer can elevate an individual’s risk. The risk is higher if a close male relative, like a father or brother, has had prostate cancer. The risk increases further if multiple family members have been affected.
  3. Genetics: Certain genetic mutations, such as BRCA1 and BRCA2, which are more commonly associated with breast and ovarian cancers, have been linked to an increased risk of prostate cancer in men.
  4. Race and Ethnicity: Prostate cancer is more commonly seen in African American men
    than in men of other races. It tends to occur at a younger age and be more aggressive in this group. On the other hand, Asian and Hispanic men have a lower risk compared to Caucasians.
  5. Occupational Exposure: Some studies have suggested that exposure to certain chemicals and toxins, such as cadmium and Agent Orange, may be associated with an increased risk of prostate cancer.
  6. Sexually Transmitted Infections(STIs): Some research has suggested a potential link between STIs and an increased risk of prostate cancer.

Diagnosis of Prostate Cancer

The diagnosis of prostate cancer typically involves a series of steps to determine whether a patient has malignant growth in the prostate gland. Following are the tests that your doctor might suggest:

How is prostate cancer diagnosed?

 1. Blood tests for prostate cancer: The Prostate-Specific Antigen (PSA) test measures the protein levels produced by the prostate gland, serving as a vital tool in screening for and monitoring prostate cancer. Typically recommended for men over 50, the PSA test can help detect prostate cancer in its early stages; that is when treatment is most effective. While a normal PSA level is generally considered four nanograms per milliliter or lower, various factors can influence PSA levels, leading to false positives and false negatives. Consequently, an elevated PSA reading often triggers further diagnostic steps, such as a digital rectal examination (DRE) and a prostate biopsy, to ascertain the presence of cancer.

However, the use of PSA screening has sparked debate due to its limitations and the potential for overdiagnosis. One should undergo PSA testing after carefully discussing it with a healthcare provider, considering individual risk factors and the overall benefits and risks associated with the test.

 2. Prostate Biopsy: A prostate biopsy is a crucial medical procedure employed to diagnose prostate cancer definitively. It is typically recommended when there are elevated PSA levels or suspicious findings during a DRE. During a prostate biopsy, a urologist or radiologist uses a thin, specialized needle to extract small tissue samples from the prostate gland, typically through the rectum or perineum. These tissue samples are then analyzed by a pathologist to determine the presence of cancer cells and to assess their aggressiveness using the Gleason score.

While a biopsy is considered the gold standard for prostate cancer diagnosis, it’s not without its potential risks, which can include bleeding, infection, or discomfort. The decision to undergo a prostate biopsy should be made in close consultation with a healthcare provider, considering individual risk factors, potential benefits, and the need for accurate diagnosis when prostate cancer is suspected.

 3. Digital Rectal Examination for prostate cancer: During a DRE, a healthcare provider, typically a urologist or primary care physician, inserts a gloved, lubricated finger into the patient’s rectum to feel the prostate gland. The examination is relatively quick, lasting only a few seconds. While it may be slightly uncomfortable, it is generally not painful.

The primary purpose of a DRE is to assess the shape, size, and texture of the gland and to check for any abnormalities that may be indicative of prostate cancer or other prostate-related conditions. It is often used as part of a comprehensive evaluation for prostate cancer.

While a DRE can identify some abnormalities, it has limitations. It can miss small or deep-seated tumors, and the assessment of the prostate’s condition is subjective, varying from one healthcare provider to another. Therefore, it is usually used as part of a broader evaluation that includes PSA testing and other imaging procedures.

Staging and Grading of Prostate Cancer

Staging and grading are essential components of diagnosing and characterizing prostate cancer.

  • Staging, often determined by the TNM system, assesses the extent of cancer’s spread. It categorizes prostate cancer into stages, ranging from localized (confined to the prostate) to advanced (spread to other organs or lymph nodes).
  • Grading, on the other hand, is typically evaluated using the Gleason score, which examines the appearance of cancer cells in a biopsy sample. Lower Gleason scores indicate less aggressive cancer, while higher scores signify a more aggressive form.

These two factors, staging, and grading, are crucial for treatment decision-making, as they help healthcare providers understand the severity of the disease and its potential to grow and spread, ultimately guiding the choice of the most appropriate treatment for each individual diagnosed with prostate cancer.

Prostate Cancer Treatment

Treatment options for prostate cancer vary depending on several factors, including the stage and aggressiveness of the cancer, the patient’s overall health, and individual preferences.

Early-stage prostate cancer

Early-stage prostate cancer is also known as localized prostate cancer. It is a condition where cancer cells are confined to the prostate gland without having spread to surrounding tissues or distant parts of the body. Typically asymptomatic, it is often detected through routine screening, such as PSA tests and digital rectal examinations.

Treatment options for early-stage prostate cancer range from active surveillance for low-risk cases to surgical removal (prostatectomy) or radiation therapy for more aggressive forms. Hormone therapy may also be used in combination with radiation in select cases.

Active Surveillance:

Active surveillance is an approach to managing low-risk or early-stage prostate cancer that closely monitors the cancer’s progression rather than immediately pursuing aggressive treatment.
It is typically recommended for men with small, low-grade tumors that are unlikely to grow rapidly or pose an immediate threat to their health. Instead of undergoing surgery or radiation therapy, individuals on active surveillance undergo periodic check-ups, including regular PSA tests, DREs, and occasional prostate biopsies, to monitor any changes in the cancer’s behavior. If there are signs that the cancer is becoming more aggressive or progressing, treatment options may be reconsidered. Active surveillance offers several benefits, such as avoiding potential side effects of immediate treatment, but it requires a commitment to ongoing monitoring and a strong doctor-patient partnership to make informed decisions about when or if treatment is necessary.
It is a suitable option for those who prefer to maintain their quality of life while keeping the option for curative treatment available if needed.

Here are the primary treatment options for prostate cancer:

Prostate Cancer Treatment

  1. Surgery (Prostatectomy): Radical prostatectomy is a surgical procedure that removes the entire prostate gland. It can be performed traditionally or using minimally invasive techniques like laparoscopy or robotic-assisted surgery. This option is often recommended for early-stage or more aggressive prostate cancers.
  2. Radiation Therapy: Radiation therapy uses high-energy beams to target and destroy cancer cells in the prostate. It can be delivered externally (external beam radiation therapy) or internally (brachytherapy). Radiation therapy is one of the most important treatment options for localized prostate cancer and is often used in combination with other treatments for more advanced cases.
  3. Hormone Therapy (Androgen Deprivation Therapy): Hormone therapy aims to reduce the levels of male hormones (androgens), which are the fuel for the growth of prostate cancer cells. This therapy is often used in combination with radiation therapy for intermediate or high-risk cases and can be a primary treatment for advanced or metastatic prostate cancer.
  4. Chemotherapy: Chemotherapy may be recommended for advanced prostate cancer that no longer responds to hormone therapy. It involves using drugs to target and kill cancer cells throughout the body.
    Immunotherapy: Some newer treatments, such as immunotherapy, aim to stimulate the body’s immune system to recognize and attack cancer cells. These treatments are still being studied and may be recommended in certain cases.
  5. Targeted Therapies: Targeted therapies are drugs that specifically target molecules or pathways involved in cancer growth. They are typically used for advanced or metastatic prostate cancer.
  6. Cryotherapy: Cryotherapy is also known as cryosurgery or cryoablation. It is a minimally invasive option for localized prostate cancer. It involves the use of extreme cold temperatures to freeze and destroy cancerous tissue in the prostate. During the procedure, thin, needle-like probes are inserted into the prostate, guided by ultrasound imaging.
  7. High-Intensity Focused Ultrasound (HIFU): HIFU uses ultrasound waves to generate heat and destroy cancerous tissue in the prostate. It is another treatment option for localized prostate cancer.
  8. Radiopharmaceuticals: These are radioactive drugs used to treat prostate cancer that has spread to the bones. They can help alleviate pain and slow the progression

What Happens If Prostrate Cancer Is Left Untreated?

Leaving prostate cancer untreated can have serious consequences, as the cancer may continue to grow and potentially spread to other parts of the body. Here are some key points about the potential outcomes of untreated prostate cancer:

What happens if prostrate cancer is left untreated?

  1. Cancer Progression: Prostate cancer can become more aggressive over time, with a higher risk of spreading to nearby tissues and organs, including the bladder, rectum, and seminal vesicles.
  2. Metastasis: Untreated prostate cancer may metastasize, which means it can spread to distant sites in the body, most commonly the bones. This can lead to bone pain, fractures, and other complications.
  3. Worsening Symptoms: As the cancer advances, urinary symptoms such as difficulty urinating, frequent urination, and blood in the urine may become more pronounced and uncomfortable.
  4. Complications: Advanced prostate cancer can lead to severe complications, including urinary tract infections, kidney problems, and issues with bowel function.
  5. Pain and Discomfort: Metastatic prostate cancer can cause significant pain and discomfort, especially in the bones. This can significantly affect a person’s quality of life.
  6. Decreased Life Expectancy: Left untreated, prostate cancer may become life-threatening. While the course of the disease varies, advanced prostate cancer can significantly reduce life expectancy.
  7. Limited Treatment Options: Delaying treatment can limit the effectiveness of available treatment options and reduce the chances of a successful outcome.

When to See Your Doctor for Prostate Cancer Screening?

The timing for prostate cancer screening is a subject of discussion among medical experts, and the decision should be individualized based on various factors, including age, risk factors, and personal preferences. However, here are some general guidelines for when to consider seeing a doctor for prostate cancer screening:

  1. If you are between 45-69 years of age
  2. African American
  3. Have a family history of prostate cancer
  4. Have symptoms suggestive of prostate cancer

Questions for Your Doctor

  1. What is my risk of developing prostate cancer?
  2. What symptoms should I be aware of that might indicate prostate cancer?
  3. Can you explain the different treatment options for prostate cancer, including their side effects and success rates?
  4. Are there any lifestyle changes or dietary recommendations to help manage or prevent prostate cancer?
  5. What can I expect during and after prostate cancer treatment regarding quality of life and
    follow-up care?
  6. Do you recommend a second opinion before starting treatment, and if so, can you provide a referral?

References

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