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Patients with a certain form of kidney disease may have a reduced risk of cancer

by Urology Today
September 8, 2020
in Urology / Nephrology News
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Patients with a certain form of kidney disease may have a reduced risk of cancer compared with patients with other kidney diseases, according to a study appearing in an upcoming issue of the Journal of the American Society of Nephrology (JASN).

Polycystic kidney disease (PKD) is a kidney disorder passed down through families in which many cysts form in the kidneys, causing them to become enlarged. It’s thought to have cancer-like features, but cancer risk has never been compared between PKD patients and others with kidney disease. Cancer risk is also elevated in people who have received a kidney transplant, due to the immunosuppressive drugs they must take.

James B. Wetmore, MD, MS (University of Kansas Medical Center) and his colleagues conducted the first study to examine cancer risk in kidney transplant recipients with PKD and to compare their risk to that of other kidney transplant recipients.

The team analyzed data from the National Cancer Institute’s Transplant Cancer Match Study, which contains information on all solid organ transplant recipients in the United States, as well as data from 15 population-based US cancer registries. For PKD recipients, the investigators compared overall cancer risk to that in the general population. They also compared cancer incidence in PKD vs non-PKD kidney transplant recipients. The analysis included 10,166 kidney transplant recipients with PKD and 107,339 without.

After adjusting for demographic differences between kidney recipients with PKD and other recipients, PKD patients were 16% less likely to develop cancer than others who received a kidney transplant. Compared with the general population, overall cancer risk was increased 48% in PKD recipients, while the overall cancer risk in non-PKD recipients was increased 86%.

The findings indicate that PKD patients who received transplants do not have a higher risk of cancer than other kidney recipients. In fact, their cancer risk may be lower. “The reason for the decreased risk is uncertain, but some factor or factors in PKD patients – either inherent in the disease process itself or related to the care PKD patients receive – is associated with lower risks of cancers,” said Dr. Wetmore. “Further study is required to determine how PKD might influence the development of cancer.”

Polycystic kidney disease
Polycystic kidney disease causes many cysts (fluid-filled sacs) to develop in the kidneys. The most common type is an inherited condition called autosomal dominant polycystic kidney disease (ADPKD). With ADPKD, problems commonly do not develop until the age of 30-50, with some people never developing any problems. The two common problems that develop are high blood pressure and kidney failure. About half of people with ADPKD develop kidney failure requiring dialysis or a kidney transplant by the age of 60.

Dr. Wetmore speculated that PKD may induce certain anti-neoplastic defense mechanisms that guard against the subsequent development of cancer. Alternatively, it may be that PKD patients, who are frequently aware that they have a progressive medical condition and who therefore typically receive close medical care for many years or decades, engage in other healthy behaviors that prevent cancer.

###

Highlights

  After adjusting for demographic differences between kidney transplant recipients with polycystic kidney disease (PKD) and other kidney transplant recipients, PKD patients
  were 16% less likely to develop cancer than others who received a kidney transplant.
  Polycystic kidney disease affects nearly 1 in 1,000 Americans.

Study co-authors include James Calvet, PhD, Alan Yu, Charles Lynch, MD, PhD Connie Wang, MD, Bertram Kasiske, MD, and Eric Engels, MD, MPH.

What is polycystic kidney disease?

  A cyst is a fluid-filled sac. Cysts occur in various sizes, in various conditions, and in various parts of the body.
  Polycystic means many cysts.
  Polycystic kidney disease is a condition where many cysts develop in the kidneys. The cysts are benign (non-cancerous) and develop from some of the kidney tubules.

Note: it is common for healthy people, especially older people, to develop, one, two, or even a few harmless cysts in a kidney. These usually cause no problems and are not due to polycystic kidney disease.

Polycystic kidney disease is a genetic condition. This means that one or more of your genes is faulty, which results in you making many cysts in your kidneys. There are different types of polycystic kidney disease:

  Autosomal dominant polycystic kidney disease (ADPKD). This is the most common type. This is a hereditary condition caused by a faulty gene which is inherited from one parent. If symptoms and problems develop, they usually start in adulthood. See the rest of this leaflet for details.
  Autosomal recessive polycystic kidney disease (ARPKD). This is a rare condition which affects about 1 in 20,000 people. Problems typically develop soon after birth. You need two faulty genes to develop this condition. You get one faulty gene from each parent (who will be well but will be ‘carriers’ of one faulty gene each).
  Non-hereditary polycystic kidney disease. In about 1 in 10 people who develop polycystic kidney disease, the faulty gene is a new mutation in the affected person. So, there are no other family members affected.

Disclosures: The authors reported no financial disclosures.

The article, entitled “Polycystic Kidney Disease and Cancer after Renal Transplantation,” will appear online at http://jasn.asnjournals.org/ on May 22, 2014.

The content of this article does not reflect the views or opinions of The American Society of Nephrology (ASN). Responsibility for the information and views expressed therein lies entirely with the author(s). ASN does not offer medical advice. All content in ASN publications is for informational purposes only, and is not intended to cover all possible uses, directions, precautions, drug interactions, or adverse effects. This content should not be used during a medical emergency or for the diagnosis or treatment of any medical condition. Please consult your doctor or other qualified health care provider if you have any questions about a medical condition, or before taking any drug, changing your diet or commencing or discontinuing any course of treatment. Do not ignore or delay obtaining professional medical advice because of information accessed through ASN. Call 911 or your doctor for all medical emergencies.

Founded in 1966, and with more than 14,000 members, the American Society of Nephrology (ASN) leads the fight against kidney disease by educating health professionals, sharing new knowledge, advancing research, and advocating the highest quality care for patients.

###

Tracy Hampton
.(JavaScript must be enabled to view this email address)
American Society of Nephrology

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