Prostate cancer medical therapy

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Syed Musadiq Ali M.B.B.S.[2] Muhammad Saad, M.B.B.S.[3]

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Overview

The predominant therapy for prostate cancer is surgical resection. Adjunctive chemotherapy, radiation, hormonal therapy, bisphosphonates, and analgesics may be required.Metastatic prostate cancer is managed according to either hormone-sensitive disease or castration-resistant disease.

Medical Therapy

Radiation therapy

  • Radiotherapy uses ionizing radiation to kill prostate cancer cells. When absorbed in tissue, ionizing radiation such as Gamma and x-rays damage the DNA in cells, which increases the probability of apoptosis.
  • Radiation therapy is commonly used in prostate cancer treatment.
  • It may be used instead of surgery or after surgery in early stage prostate cancer. Radiation therapy appears to cure small tumors that are confined to the prostate just about as well as surgery.[1]
  • In advanced stages of prostate cancer, radiation is used to treat painful bone metastases.
  • Radiation therapy is often offered to men whose medical problems make surgery more risky.
  • Two different kinds of radiation therapy are used in prostate cancer treatment:[1]
  • Rising PSA on ADT, if testosterone level is not completely suppressed, luteinizing hormone (LH) can be measured.
  • If its non-suppressed LH, correct administration of the GnRH analogue can be verified.[2]

Side effects of radiation therapy

Hormonal therapy

  • Hormonal therapy uses medications or surgery to block prostate cancer cells from getting dihydrotestosterone (DHT), a hormone produced in the prostate and required for the growth and spread of most prostate cancer cells. Blocking DHT often causes prostate cancer to stop growing and even shrink.[6]
  • Hormonal therapy for prostate cancer targets the pathways the body uses to produce DHT. A feedback loop involving testicles, hypothalamus, pituitary, adrenal, and prostate glands to control the blood levels of DHT. First, low blood levels of DHT stimulate the hypothalamus to produce gonadotropin releasing hormone (GnRH). GnRH then stimulates the pituitary gland to produce luteinizing hormone (LH), and LH stimulates the testicles to produce testosterone. Finally, testosterone from the testicles and dehydroepiandrosterone from the adrenal glands stimulate the prostate to produce more DHT. Hormonal therapy can decrease levels of DHT by interrupting this pathway at any point.
  • Hormonal therapy rarely cures prostate cancer because cancers which initially respond to hormonal therapy typically become resistant after one to two years. Hormonal therapy is therefore usually used when cancer has spread from the prostate.[7]
  • It may also be given to certain men undergoing radiation therapy or surgery to help prevent return of their cancer.[8]
  • There are several forms of hormonal therapy:[1][9]

Chemotherapy

  • Chemotherapy is used in the treatment of castrate resistant prostate cancer (also called hormone-refractory prostate cancer).
  • The most commonly used regimen combines the chemotherapeutic drug liste below:

Other Medications

Metastatic Disease:

Metastatic prostate cancer is managed according to either hormone-sensitive disease or castration-resistant disease.

Hormone Sensitive Disease:

Following algorithm helps to manage hormone sensitive metastatic cancer.[12][13][14][15][16][17][18][19][20][21][22]

 
 
 
 
 
 
 
Sequence germline and tumor DNA

Initiate androgen deprivation therapy

• GnRH agonist or antagonist
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Low-volume Disease
 
 
 
 
 
 
 
High-volume Disease
Visceral metastasis or >4 bone lesions
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Androgen receptor pathway inhibitor (ARPI)
• Enzalutamide, abiraterone, apalutamide
 
 
 
 
 
 
 
Combination Chemotherapy plus ARPI
• 6 cycles of docetaxel plus abiraterone or darolutamide
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Progression to castration resistant disease
 
 
 

Castration Resistant disease:

Following flowchart helps in managing metastatic prostate cancer which is castration resistant.[23][24][25][26][27][28][29][30][31][32][33][34][35]

 
 
 
 
 
 
 
Castration resistant disease
Initiate denosumab or bisphosphonate if bone metastasis present
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior ARPI therapy
 
 
 
 
 
 
 
No Prior ARPI therapy

•Begin ARPI

•If DNA repair deficiency present, add olaparib(PARPI)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Continued progression
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Second ARPI
 
 
 
Chemotherapy
 
 
 
 
Targeted therapies

Targeted therapies may include:

  • Poly ADP ribose polymerase inhibitor(PARPI)
  • PD-1 inhibitor
  • Radiation based therapy:
    • Lutetium Lu 177
    • Radium-233 dichloride

References

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