Roberta Fenoglio1*
Martina Cozzi1
Giulio Del Vecchio1
Savino Sciascia1Antonella Barreca2
Alessandro Comandone3
Dario Roccatello1- 1CMID-Nephrology and Dialysis Unit (ERK-net, ERN-Reconnect and RITA-ERN Member), San Giovanni Bosco Hub Hospital and Department of Clinical and Biological Sciences, University of Torino, Turin, Italy
- 2Division of Pathology, Città della Salute e della Scienza Hospital and University of Turin, Turin, Italy
- 3Division of Oncology, San Giovanni Bosco Hub Hospital, Turin, Italy
Introduction: The introduction of innovative therapies, resulting from revisiting cancer as a disease of the immune system, has changed the scenario of complications. These new classes of drugs, such as targeted therapies and immune checkpoint inhibitors, assure substantial advantages in cancer therapy, despite some side effects affecting various organs, including the kidney. Histological evaluations of kidney disorders induced by targeted/immunotherapy are limited.
Method: In this study we examined the histological features of patients treated with new cancer agents who underwent a kidney biopsy for new onset kidney failure and/or urinary abnormalities.
Results: The cohort included 30 adult patients. The most frequently administered therapies were immunotherapy (30%), targeted therapy (26.7%), immunotherapy plus targeted therapy (13.3%), immunotherapy plus chemotherapy (13.3%), targeted therapy plus chemotherapy (16.7%). The most common histological finding was tubular interstitial nephritis (30%) that was associated with acute tubular necrosis in 4 cases, and thrombotic microangiopathy (23.3%). After kidney biopsy, 16 of the 30 patients were treated according to the histological diagnosis. Fourteen patients were treated with steroids. One patient with membranous nephropathy was treated with a single dose of rituximab. A patient with severe thrombotic microangiopathy requiring dialysis received a treatment with eculizumab for 3 months. Overall some renal response was obtained in all patients treated with glucocorticoids, while complete kidney response was achieved in the patient treated with rituximab. Cancer treatment was resumed without change in 21 out of 30 patients.
Conclusion: Kidney biopsy is critical for the management of kidney toxicities and should be strongly encouraged for patients showing adverse kidney effects of novel cancer agents.
Introduction
Over time, nephrologists have learned about the most frequent side effects related to the use of conventional drugs such as cisplatin or alkylating agents (1, 2). However, in recent years the introduction of innovative therapies, resulting from revisiting oncologic disease as a disease of the immune system, has changed the scenario of complications (3).
After a few years from the introduction of these new agents it became clear that kidney was one of the targeted organs for possible toxicity (4). An initial delay in the recognition of kidney adverse effects was due to the timing of kidney damage development, that is later than the observation period of registration studies (5) and the exclusion of patients with known kidney impairment from registration studies.
Kidney disease has a significant impact on the management of cancer patients leading to either temporary or definitive discontinuation of therapy, prescription of inadequate doses, and use of suboptimal drugs. All these promote tumor growth and metastases.
Anti-angiogenic drugs are responsible for vascular and/or glomerular damage. The spectrum of the possible histological lesions is constantly evolving, and besides thrombotic microangiopathy (TMA) and focal segmental glomerulosclerosis (FSGS), others histological features are emerging (6).
Among the targeted drugs, tyrosine kinase inhibitors (TKIs) are taking a growing role. TKIs are involved in the signal transduction pathways that regulates cell proliferation, differentiation, migration, metabolism and anti-apoptotic signals. The signal pathway that is most used by TKIs, as some monoclonal antibodies, is that of vascular endothelial growth factor A - vascular endothelial growth factor receptor 2 (VEGFA-VEGFR2) (7).
A review of 72 randomized controlled trials showed a significant association between the use of TKIs and the appearance of proteinuria as a consequence of a podocytopathy related to an altered phosphorylation of nephrine (8). Accordingly, histological findings of minimal change disease (MCD) and FSGS have been reported (9–11).
For instance, recent reports suggest that gefitinib, an epidermal growth factor receptor (EGFR) inhibitor, can trigger diverse renal kidney pathologies including MCD, tubulo-interstitial nephritis (TIN), membranous nephropathy (MN) and IgA nephropathy (IgAN) (12–14).
Immune checkpoint inhibitors (ICIs) are monoclonal antibodies that counteract tumor-induced repression of T lymphocytes by interacting with tumor cell ligands and inhibiting their interaction with T lymphocytes. Acute kidney injury (AKI) (15) and proteinuria have been reported.
However, to establish incidence and define the type of kidney damage histologic evidence is needed (16–21).
In addition to their antiangiogenic activity, inhibitors of the vascular endothelial growth factor (VEGF) pathway enhance the anti-cancer activity of ICIs by blocking tumor-induced immune-suppressive cells and increasing T-cell infiltration into tumors (22–24). Based on this evidence, both the Food and Drug Administration (FDA) and the European Medicines Agency (EMA) recently approved axitinib, a tyrosine kinase inhibitor, in combination with avelumab or pembrolizumab, anti-programmed cell death protein 1/ligand 1 (PD-1/PD-L1), for the first-line treatment of patients with advanced kidney cell carcinoma (25–27).
The use of ICIs in combination with antiangiogenic agents renders both the diagnosis and the management of toxicities more complex The use of ICIs in combination with antiangiogenic agents renders both the diagnosis and the management of toxicities more complex, as some of the adverse events (AEs) of ICIs are similar to antiangiogenic therapy. Recognizing the specific etiology of each AE based on a histologic basis is critical to optimize the continuation of treatment (28) and strategies to distinguish between immune-related AEs caused by ICIs versus those resulting from TKIs are needed to optimize the management of side effects due to multi drug therapy.
The recommendations for kidney biopsy in patients with cancer have recently been updated (29). However, indications remain restricted. Kidney biopsy has been recommended in patients who present with new onset proteinuria (≥1 g per day) or worsening kidney function when the diagnosis of kidney disease cannot be otherwise established (30). This report aims at dispelling the myth that kidney biopsy must be limited to these restricted clinical settings. In order to address this scope we reviewed the histological features of patients treated with new cancer therapies (i.e., targeted therapies and immunotherapies) who underwent a kidney biopsy for new onset kidney impairment and/or urinary abnormalities.
Materials and methods
This is a single-center retrospective observational study on patients with cancer treated with targeted/immunotherapy who underwent kidney biopsy of the native kidney between July 2017 and July 2022. Laboratory and clinical data were evaluated at the time of kidney biopsy. Demographic data, medication history, type of cancer, comorbidities, diagnosis of kidney disease and therapeutic decisions were collected. Kidney function was assessed by measuring estimated glomerular filtration rate, in accordance with the Kidney Disease Outcomes Quality Initiative guidelines using the formula of Modification of Diet in kidney Disease, and proteinuria obtained by 24-hour urine collection. AKI was defined according to the Kidney Disease Improving Global Outcomes (KDIGO) criteria. Biopsy indication for AKI required at least a doubling of serum creatinine (sCr) values from those at baseline. Histological evaluation was performed by a single pathologist.
Results
Our cohort included 30 adult patients (16 males and 14 females) with ongoing targeted/immuno- therapies. Demographic and clinical characteristics are shown in Table 1. The mean age was 65 years (range 32-82) at the time of biopsy. The most frequent sites of malignancies were the lung (23.3%), the urinary tract (20%) and the abdomen (13.3%). Six patients had 2 different cancers. Overall, 73.3% of patients had stage IV cancer or higher.
Table 1 Demographic and clinical characteristics, treatment at the time of biopsy and biopsy indications.
Oncologic treatments are summarized in Figure 1. Twelve patients (40%) presented with kidney toxicity during the first-line therapy, the other 18 (60%) were given > 1 previous treatments.
Figure 1 Number (A) and classes (B) of cancer drugs that patients were taking at the time of the biopsy.
The most frequently administered therapies were immunotherapy (#9 pts, 30%), targeted therapy (#8 pts, 26.7%), immunotherapy plus targeted therapy (#4 pts, 13.3%), immunotherapy plus chemotherapy (#4 pts, 13.3%), targeted therapy plus chemotherapy (#5 pts, 16.7%).
Eleven patients (36.7%) developed AKI, 6 (20%) AKI with isolated proteinuria, 4 (13.3%) AKI with proteinuria and hematuria, 8 (26.7%) isolated proteinuria (in nephrotic range in 5 patients) and 1 (3.3%) proteinuria and hematuria.
In patients receiving first-line immunotherapy before kidney biopsy the average latency time was 5.6 months (min 3 – max 9).
The most common disease (Figure 2) was TIN (#10 patients, 30%), that was associated with acute tubular necrosis (ATN) in 4 patients, and TMA (#7 patients, 23.3%). Two patients had anti-PLA2r positive MN (6.7%), 2 had diabetic nephropathy (6.7%) and 2 had ATN (6.7%). The other patients had a membranoproliferative glomerulonephritis (MPGN) (1 patient), FSGS (1 patient), full-house nephropathy (1 patient), nephroangiosclerosis (1 patient) and IgAN (1 patient). One patient had a double nephropathy (FSGS plus TMA), and one had 3 different histological injuries (ATN plus TMA plus Fabry Disease) (Figure 3).
Figure 2 Distribution of histological diagnosis. TMA, thrombotic microangiopathy; TIN, tubule-interstitial nephritis; ATN, acute tubular necrosis; MN, membranous nephropathy; DN, diabetic nephropathy; MPGN, membranoproliferative glomerulonephritis; FSGS, focal segmental glomerulosclerosis; IgAN, IgA nephropathy.
Figure 3 Electron microscopy showing Zebra Bodies in a patient who received a diagnosis of Fabry disease.
After kidney biopsy, 16 out of the 30 patients were specifically treated according to the histological diagnosis (Figure 4). Fourteen patients (46.7%) were treated with steroids: 10 patients with TIN (100% of pts), 1 patient with MN, 1 with MPGN, 1 with full-house glomerulonephritis and 1 with IgAN. All of them received intravenous methylprednisolone pulses followed by oral prednisone that was rapidly tapered and discontinued within 3 months. One patient with MN was treated with low doses of rituximab. The patient with TMA required dialysis that was discontinued following a 3 month eculizumab therapy.
Figure 4 Number of treatment discontinuations or continuations with or without specific therapy after kidney biopsy.
Overall kidney response was obtained in all patients treated with glucocorticoids, while complete kidney response was achieved in the patient treated with rituximab. To date, no patient has experienced a relapse.
Cancer treatment was continued without change in 21 out of 30 patients (70%). One drug was discontinued in 4 out of 30 patients (13.3%) who underwent multiple drug therapy. Treatment was temporarily discontinued in 1 patient (3.4%) and definitively in 4 (13.3%) (Table 2). Patients who required permanent discontinuation of treatment had a TMA on kidney biopsy and were on anti-VEGF therapy (3 patients on bevacizumab and 1 patient on sunitinib). In two of them therapy was discontinued during the maintenance regimen.
Table 2 Clinical characteristics at the time of kidney biopsy, histological findings and indications for continuation/discontinuation of cancer treatment after kidney biopsy.
Discussion
New cancer therapies have completely changed the concept of therapeutic targets, but have forced clinicians to face new adverse events. Adverse events triggered by these new types of therapy need to be managed differently from adverse events triggered by traditional therapy with the management tailored to the type of kidney insult (31). From a theoretical point of view the ideal target should be essential for malignant cells survival and unexpressed on normal cells, leading to malignant cell death and minimal effect on normal cell function (32). In real life this is not the case. Anti-cancer molecular targeted therapies are associated with side effects involving different organs, including the kidney, with a number of manifestations including AKI (31). In this context, a kidney biopsy is the reliable method to evaluate kidney involvement and provide specific treatment.
As per the recent literature (33, 34), the most frequent indication for kidney biopsy was AKI (>55%) that was isolated or associated with proteinuria with or without hematuria. Our data, in agreement with the literature (35), showed that the most frequently histological feature during immunotherapy was tubulointerstitial nephritis which can occur alone or in combination with other kidney lesions. Vascular injury and glomerular injury occur with anti-angiogenesis drugs targeting the vascular endothelial growth factor (36). Although a number of lesions have been described in association with targeted therapy, TMA is the most common lesion associated with agents targeting vascular endothelial growth factor and it is frequently associated with acute kidney injury (6). In our cohort, kidney biopsy revealed TMA in 8 out of 17 patients (47%) treated with an anti-VEGF drug.
Currently, adverse kidney events result in reduction or discontinuation of therapy in a high percentage of patients, thereby affecting patient outcome. There are no specific evidence-based guidelines for the management of adverse kidney events in patients receiving anti-cancer molecular targeted therapies. The American guidelines recommend temporary discontinuation of bevacizumab in patients with proteinuria >2 g/day, and permanent discontinuation for nephrotic syndrome regardless of the cause. In regards to TKIs discontinuation, FDA guidelines are even more confusing: proteinuria ≥3 g/day for pazopanib, ≥2 g/day for lenvatinib, and undefined proteinuria for axitinib. There are no guidelines for other agents such as sorafenib, sunitinib, vandetanib and cabozantinib. With regard to ICIs, the guidelines of the Society for Immunotherapy and the American Society of Oncologists (37) mention “symptomatic nephritis” and refer to kidney function as estimated on serum creatinine. The intervention of the nephrologist is only foreseen following therapy discontinuation. Definitive discontinuation is indicated in the presence of nephrotic range proteinuria regardless of the cause.
Based on histological findings, definitive discontinuation of treatment in our cohort was indicated in a very limited number of patients (13.3%). All of them had anti-VEGF-related TMA. Treatment discontinuation was unneeded in patients treated with ICIs. In patients treated with multidrug therapy that combined conventional anticancer drugs with molecular targeted agents, the histological findings made it possible to identify the weight of specific injury. That led to targeted modifications of the therapeutic protocols, and allowed discontinuation of a single drug. In patients treated with the “pembrolizumab-axitinib” combination (28), histological evaluation allowed identification of specific lesions and discontinuation of the drug that was actually responsible for the kidney injury.
The optimal treatment for adverse events in patients who undergo new anti-cancer therapies is debated. Glucocorticoids are the cardinal treatment for adverse events. However, dose and treatment duration remain to be defined. Consensus guidelines recommend on occasions the addition of a second immunosuppressant (38–40). In our cohort all patients who underwent a biopsy-addressed treatment achieved kidney response and to date, none experienced a relapse. It is worth to remind that patients who do not achieve kidney recovery had a higher mortality compared to those with complete or even partial kidney remission (33). The increased mortality associated with failure to recover from AKI may reflect the limited therapeutic options offered to patients with impaired kidney function, and emphasized the relevance of early recognition and treatment of kidney impairment before irreversible damage occurs (33).
Notably, histological findings were not consistent with drug-related damage in 6 out of 30 patients (20%). These findings allowed to avoid glucocorticoid prescription which would have been indicated according to current guidelines but would have been useless in these patients. In two patients kidney biopsy revealed double and triple nephropathy, respectively. In the latter case, the patient had a diagnosis of Fabry disease (Figure 4) which was confirmed by genetic testing.
In conclusion, the trend of rapid approval of new drugs brings challenges to the management of drug-related kidney toxicities. The clinician’s challenge is allowing patients to continue life-saving treatments by effectively managing adverse kidney effects. Nephrologists and nephro-immunologists should learn to treat the nephrotoxic sequelae of cancer therapy and allow continuation of the life-saving treatment (41). In this context kidney biopsy is a mandatory diagnostic and prognostic tool.
To our knowledge this is one of the single-center studies with the largest number of cancer patients treated with targeted/immunotherapy who systematically underwent histological evaluation after developing AKI or urinary abnormalities. Our data indicate that kidney biopsy should be considered in every cancer patient who develops urinary abnormalities or shows a worsening of kidney function during treatment with immunotherapy or targeted therapy. Based on histological features treatment discontinuation can be limited to a restricted number of patients while allowing to achieve an overall kidney response in patients receiving a specific treatment.
Kidney biopsy is cardinal in the management of kidney toxicities from new cancer agents and in spite of current international guidelines should be encouraged.
Data availability statement
The original contributions presented in the study are included in the article/supplementary material. Further inquiries can be directed to the corresponding author.
Ethics statement
Written informed consent was obtained from the patients for the publication of any potentially identifiable data included in this article.
Author contributions
Author Contributions Conceptualization: RF and DR. Resources: AB and AC. Collection data: MC and GD. Writing original draft preparation: RF and DR. Supervision: SS. All authors contributed to the article and approved the submitted version.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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Keywords: onconephrology, immune checkpoint inhibitors, targeted therapies, renal biopsy, renale adverse events of anticancer treatments, thrombothic micro-angiopathy (TMA), interstitial tubular nephritis
Citation: Fenoglio R, Cozzi M, Del Vecchio G, Sciascia S, Barreca A, Comandone A and Roccatello D (2023) The need for kidney biopsy in the management of side effects of target and immunotherapy. Front. Nephrol. 3:1043874. doi: 10.3389/fneph.2023.1043874
Received: 14 September 2022; Accepted: 01 February 2023;
Published: 27 February 2023.
Edited by:
Sabine Karam, University of Minnesota Health Twin Cities, United StatesReviewed by:
Marta Pirovano, University of Milan, ItalyMaria Jose Soler Soler, Vall d’Hebron University Hospital, Spain
Copyright © 2023 Fenoglio, Cozzi, Del Vecchio, Sciascia, Barreca, Comandone and Roccatello. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Roberta Fenoglio, roberta.fenoglio@unito.it