Onco nephrology, also called onconephrology, is a specialized area of nephrology focused on kidney-related problems in people with cancer.

Cancer and kidney health can affect each other in several ways. A patient may already have chronic kidney disease before cancer treatment begins, or kidney problems may develop because of the cancer itself, dehydration, infection, urinary obstruction, metabolic abnormalities or cancer therapy.

Modern cancer treatment has also introduced additional kidney-related considerations. Chemotherapy, targeted therapies and immunotherapies can affect kidney function through different mechanisms.

This is why kidney monitoring can be an important part of comprehensive cancer care.

At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides specialist evaluation of kidney complications in patients with cancer and helps coordinate kidney-focused management according to the individual's clinical situation.

Why Do Cancer Patients Need Kidney Monitoring?

The kidneys may be affected before, during or after cancer treatment.

A patient receiving cancer therapy may experience:

• Acute kidney injury

• Worsening of pre-existing chronic kidney disease

• Changes in potassium or other electrolytes

• Proteinuria

• Blood in urine

• High blood pressure

• Fluid and acid-base disturbances

• Medication-related kidney injury

• Urinary obstruction

• Kidney-related complications associated with cancer itself

Research in onconephrology describes a broad range of kidney injuries associated with cancer and its treatments, including tubular, interstitial, glomerular and microvascular injury.

Regular assessment can help identify kidney abnormalities early and allow the oncology and nephrology teams to consider appropriate management.

How Can Cancer Affect the Kidneys?

Kidney problems in a person with cancer do not always mean that the cancer treatment itself caused the problem.

Possible causes include:

Dehydration

Vomiting, diarrhea, poor oral intake, fever or other complications can reduce circulating fluid volume and contribute to acute kidney injury.

Infection

Cancer patients may be vulnerable to infections, particularly depending on the cancer and treatment. Severe infection can affect blood pressure and kidney function.

Urinary Obstruction

A tumor or other structural problem may interfere with urine drainage.

Obstruction involving the kidneys or ureters can cause hydronephrosis and deterioration in kidney function.

Metabolic Abnormalities

Certain cancers can produce metabolic disturbances that affect the kidneys.

Cancer-Related Kidney Diseases

Some malignancies may be associated with glomerular diseases, abnormal protein levels, vascular complications or other kidney disorders.

Treatment-Related Injury

Chemotherapy, targeted medicines and immunotherapies can cause different forms of renal toxicity.

Determining the actual cause is important because treatment differs according to the underlying mechanism.

Can Chemotherapy Damage the Kidneys?

Yes. Some anticancer medicines can affect kidney function.

The degree and type of kidney injury depend on the particular drug, dose, treatment combination, patient characteristics and other clinical factors.

Certain conventional chemotherapy agents can cause tubular injury, while other treatments may produce different forms of renal toxicity. Cisplatin, for example, is a well-recognized nephrotoxic chemotherapy agent.

This does not mean that every patient receiving chemotherapy will develop kidney damage.

The oncology team may monitor kidney function before and during treatment so that renal abnormalities can be identified and addressed.

What Is Chemotherapy-Related Nephrotoxicity?

Nephrotoxicity refers to kidney injury caused by a substance, medicine or treatment.

In cancer care, nephrotoxicity may present as:

• Rising serum creatinine

• Reduced eGFR

• Reduced urine output

• Electrolyte abnormalities

• Proteinuria

• Blood in urine

• Fluid imbalance

• Acid-base abnormalities

Different cancer medicines can affect different parts of the kidney.

The cause of a creatinine rise therefore needs to be investigated rather than automatically assuming that chemotherapy is responsible.

Can Immunotherapy Affect the Kidneys?

Yes.

Immune checkpoint inhibitors and other immunotherapies can cause immune-related adverse effects involving the kidneys.

One recognized kidney complication is acute tubulointerstitial nephritis, although other renal abnormalities can occur.

A patient receiving immunotherapy who develops:

• Rising creatinine

• New proteinuria

• Blood in urine

• Electrolyte abnormalities

• Unexplained kidney dysfunction

may require nephrology assessment.

The decision to modify or temporarily interrupt cancer treatment should be made by the treating oncology team in collaboration with appropriate specialists. Patients should not stop cancer medicines independently.

What About Targeted Cancer Therapies?

Targeted cancer therapies have expanded treatment options for many cancers, but some can also affect kidney function.

Depending on the medicine, possible renal effects include:

• Proteinuria

• Hypertension

• Acute kidney injury

• Interstitial nephritis

• Thrombotic microangiopathy

• Electrolyte disturbances

Anti-angiogenic therapies, for example, have been associated with hypertension and proteinuria as well as specific renal lesions.

Because the pattern of injury can vary considerably between medicines, the complete treatment history is important when evaluating a cancer patient with kidney dysfunction.

Can Cancer Treatment Raise Creatinine Without True Kidney Damage?

Yes, in some circumstances.

Certain medications can interfere with the way creatinine is handled by the kidneys without causing equivalent structural kidney injury.

For example, some targeted therapies may inhibit creatinine secretion and produce a rise in serum creatinine that needs to be distinguished from genuine reduction in filtration.

This is one reason why a creatinine increase should be interpreted in context rather than automatically labeled as irreversible kidney damage.

The nephrologist may review:

• Previous creatinine values

• eGFR trend

• Urine findings

• Medication history

• Fluid status

• Electrolytes

• Blood pressure

• Imaging

• Other relevant laboratory results

What Kidney Tests Are Important During Cancer Treatment?

Kidney monitoring varies according to the cancer, treatment regimen and patient's medical history.

Possible assessments include:

Serum Creatinine

Creatinine provides information about kidney filtration and is commonly monitored during systemic cancer treatment.

eGFR

eGFR helps estimate kidney filtration and may assist with overall assessment and medication planning.

Urinalysis

Urine testing can identify:

• Blood

• Protein

• Infection-related findings

• Other abnormalities

Urine Albumin or Protein Testing

New or worsening proteinuria may provide an important clue to certain forms of kidney injury.

Electrolytes

Tests may include:

• Potassium

• Sodium

• Bicarbonate

• Magnesium

• Calcium

• Phosphorus

The appropriate panel depends on the treatment and clinical situation.

Blood Pressure

Some cancer therapies can cause or worsen hypertension, making regular blood-pressure monitoring important.

What Happens If Creatinine Rises During Cancer Treatment?

A rising creatinine level does not automatically mean that cancer treatment must be stopped.

The first step is to investigate why kidney function has changed.

The medical team may consider:

• Dehydration

• Infection

• Urinary obstruction

• Recent procedures

• Other medicines

• Chemotherapy toxicity

• Immunotherapy-related kidney injury

• Targeted therapy-related injury

• Contrast exposure

• Cancer-related kidney disease

• Acute kidney injury superimposed on CKD

Recent reviews emphasize the need for a broad differential diagnosis when acute kidney injury occurs during anticancer treatment.

Depending on the cause, management may include fluid correction, treatment of infection, relieving obstruction, adjusting potentially harmful medicines or using specific therapy for an immune-mediated or other renal condition.

Does a Cancer Patient With Kidney Disease Need to Stop Chemotherapy?

Not necessarily.

Cancer treatment decisions are highly individualized.

A kidney abnormality may sometimes be managed while cancer therapy continues, whereas a significant treatment-related kidney injury may require modification of the regimen.

The decision can depend on:

• Severity of kidney injury

• Type of renal lesion

• Cancer type and treatment

• Available alternative therapies

• Cancer response

• Overall health

• Potential benefits and risks of continuing treatment

Some cases may require nephrology and oncology teams to work together before deciding whether a treatment should be continued, modified or temporarily withheld.

Patients should never discontinue chemotherapy, immunotherapy or targeted therapy on their own.

Is Kidney Biopsy Ever Needed in a Cancer Patient?

Sometimes.

A kidney biopsy may be considered when the cause of kidney dysfunction or urinary abnormalities remains uncertain and when the result could change management.

Cancer patients can develop different renal lesions, including:

• Acute tubular injury

• Acute interstitial nephritis

• Glomerular disease

• Thrombotic microangiopathy

• Other kidney disorders

Recent clinical literature highlights the role of kidney biopsy in selected cancer patients with unexplained kidney dysfunction or urinary abnormalities, particularly when modern targeted or immune therapies are involved.

A biopsy is not necessary for every patient. The decision depends on the clinical circumstances, bleeding risk, treatment plan and whether the information obtained is likely to affect management.

Onco Nephrology and Chronic Kidney Disease

Some cancer patients already have CKD before their cancer diagnosis.

Pre-existing CKD may affect:

• Selection or dosing of certain medicines

• Fluid management

• Contrast-related decisions

• Risk assessment

• Monitoring frequency

• Management of complications

Patients with CKD and cancer therefore benefit from individualized coordination between their cancer and kidney teams.

A patient should not assume that having CKD means cancer treatment is impossible. Treatment options depend on the specific cancer, kidney function, available therapies and overall clinical condition.

Kidney Problems in Blood Cancer

Certain blood cancers can be associated with kidney complications.

Depending on the disease, kidney dysfunction may be related to:

• Abnormal proteins

• High uric acid

• High calcium

• Dehydration

• Infection

• Medication effects

• Tumor-related processes

For example, disorders involving abnormal immunoglobulin or light-chain production can cause significant kidney injury.

Patients with multiple myeloma and other hematological malignancies may therefore require close kidney monitoring as part of their overall treatment.

Onco Nephrology and Electrolyte Disorders

Cancer and its treatment can produce complex electrolyte abnormalities.

Possible problems include:

• Low sodium

• High or low potassium

• Low magnesium

• Calcium abnormalities

• Phosphate disturbances

• Acid-base disorders

Some abnormalities can become medically urgent.

The underlying cause may involve the cancer, kidney dysfunction, medications, fluid losses or hormonal effects.

Treatment should therefore address the cause rather than simply correcting the laboratory value without investigation.

What Is the Role of Fluid Management?

Fluid management can be particularly important in patients undergoing cancer treatment.

Too little fluid can contribute to dehydration and acute kidney injury.

Too much fluid may also be harmful in patients with:

• Reduced kidney function

• Heart failure

• Fluid overload

• Certain advanced cancers

Therefore, there is no universal instruction to “drink more water” for every cancer patient with kidney concerns.

Fluid recommendations should be individualized by the treating medical team.

Can Onco Nephrology Help Protect Kidney Function?

Yes, kidney-focused care can be incorporated into cancer treatment planning.

Potential goals include:

• Identifying pre-existing kidney disease

• Establishing baseline kidney function

• Monitoring kidney function during treatment

• Recognizing nephrotoxicity early

• Managing electrolyte disturbances

• Reviewing potentially kidney-affecting medicines

• Addressing hypertension

• Managing proteinuria

• Treating acute kidney injury

• Supporting appropriate cancer treatment decisions

• Planning kidney replacement therapy when necessary

The objective is not simply to maintain a laboratory number. It is to preserve kidney function while supporting appropriate cancer treatment.

When Should a Cancer Patient See a Nephrologist?

Nephrology assessment may be appropriate when a cancer patient develops:

• Rising creatinine

• New or worsening proteinuria

• Blood in urine

• Reduced urine output

• Significant electrolyte abnormalities

• New hypertension

• Acute kidney injury

• Chronic kidney disease

• Fluid overload

• Suspected treatment-related nephrotoxicity

• Unexplained kidney dysfunction

Early nephrology involvement can be particularly useful when the cause of kidney injury is unclear or when cancer treatment decisions may be affected.

What Should You Bring to an Onco Nephrology Consultation?

A complete treatment history can make kidney evaluation more informative.

Patients may bring:

• Recent creatinine and eGFR reports

• Previous kidney-function results

• Urine reports

• Complete cancer diagnosis and staging records

• Chemotherapy records

• Immunotherapy or targeted therapy details

• Current medicine list

• Blood-pressure readings

• Imaging reports

• Hospital discharge summaries

• Previous kidney biopsy reports, if available

Knowing the timing of kidney-function changes in relation to cancer treatment can be particularly useful.

Kidney and Cancer Care at Prabhakar Bhurke Clinic

At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides specialist nephrology evaluation for patients whose cancer or cancer treatment is associated with kidney concerns.

Depending on the patient's clinical needs, evaluation may include:

• Baseline kidney-function assessment

• Review of creatinine and eGFR trends

• Proteinuria and urine abnormality assessment

• Acute kidney injury evaluation

• Medication-related kidney injury assessment

• Electrolyte and acid-base evaluation

• Fluid-status assessment

• Management of CKD in patients with cancer

• Evaluation of suspected chemotherapy or immunotherapy-related kidney injury

• Dialysis assessment when clinically indicated

• Coordination with oncology and other specialists when required

Each treatment plan depends on the patient's cancer diagnosis, kidney function, medications, treatment goals and overall health.

Frequently Asked Questions

What is onco nephrology?

Onco nephrology is a specialized area of nephrology dealing with kidney disease and kidney-related complications in people with cancer, including complications associated with cancer therapies.

Can chemotherapy cause kidney damage?

Yes. Certain chemotherapy medicines can cause kidney injury, but the risk varies by drug, dose, treatment combination and patient factors. Not every person receiving chemotherapy develops kidney damage.

Can immunotherapy affect kidney function?

Yes. Immune-based cancer treatments can cause kidney-related immune adverse effects, including acute interstitial nephritis in some patients.

What should I do if creatinine increases during cancer treatment?

Inform the treating oncology team and seek appropriate medical evaluation. A creatinine increase can have several causes, and determining the cause is important before changing cancer treatment.

Does a high creatinine level always mean cancer treatment must stop?

No. The response depends on the severity and cause of kidney dysfunction, the specific cancer treatment and available alternatives. Decisions should be made by the treating oncology and nephrology teams.

Can cancer patients with CKD receive chemotherapy?

Some patients with CKD can receive cancer treatment, but the choice and dosing of therapy may need to be individualized according to kidney function and the specific treatment.

Is kidney biopsy necessary for every cancer patient with kidney problems?

No. A biopsy is considered selectively when determining the cause of kidney injury is important for management and when the expected information outweighs the procedure's risks.

Can kidney function recover after cancer treatment-related AKI?

Recovery is possible in some cases, particularly when the underlying cause is identified and treated promptly. The degree of recovery depends on the type and severity of kidney injury and the patient's overall condition.

Conclusion

Onco nephrology brings kidney expertise into the care of patients with cancer, helping address kidney disease that may exist before cancer treatment or develop during the course of therapy.

Chemotherapy, immunotherapy and targeted cancer medicines can produce different types of kidney complications, while dehydration, infection, obstruction, metabolic abnormalities and the cancer itself can also affect renal function.

A rise in creatinine should therefore be investigated rather than automatically attributed to chemotherapy or assumed to represent permanent kidney damage.

Early identification of kidney abnormalities, appropriate laboratory monitoring and communication between nephrology and oncology teams can help guide individualized treatment decisions.

For specialized kidney evaluation and onco nephrology care, patients can consult Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, at Prabhakar Bhurke Clinic.

Medical Disclaimer

This article is intended for general educational and informational purposes only and should not be considered a substitute for medical diagnosis, treatment or individualized medical advice. Kidney problems in people with cancer can have multiple causes, including cancer-related complications, dehydration, infection, obstruction, pre-existing kidney disease and adverse effects of chemotherapy, immunotherapy or targeted therapy. Do not stop, reduce or change cancer medicines, immunosuppressants, pain medicines or other prescriptions without guidance from the treating medical team. Seek urgent medical attention for very little or no urine, severe breathlessness, confusion, severe swelling, persistent vomiting, severe weakness or rapidly worsening symptoms. Consult Dr. Sandip Prabhakar Bhurke or another qualified nephrologist in coordination with the patient's oncology team for individualized care.