This study examined the clinical indications and timing for native nephrectomy (NN), together with the associated pathological findings in transplant patients with autosomal dominant polycystic kidney disease (ADPKD) at our institute over a period of 20 years.

A retrospective review was performed of ADPKD patients who had undergone both kidney transplantation and NN. Patients were identified from the kidney transplant database between 1988 and 2008 at Guy's and St Thomas' Hospital and the notes reviewed. All NN specimens were re-reviewed and reported according to current guidelines.

There were 157 kidney transplants performed for ADPKD (114 cadaveric and 43 living donor). Of these, 31 required NN (28 bilateral). The timing of NN was pre-transplant in 10 cases, at the time of the transplant in 1 case and post-transplant in 20 cases. The indications for NN were urinary tract infection (n=14, 45%), pain (n=12, 39%), tumour suspicion (n=3, 10%), haematuria (n=1, 3%) and space (n=1, 3%). Mortality in this NN series was 3%, with a 65% surgical morbidity rate. The length of hospital stay post-NN was significantly longer with open compared with laparoscopic techniques (p=0.003). There were two renal cell carcinomas (RCCs) in this series. Both patients presented with macroscopic haematuria (bilateral pT1a papillary RCCs in one case and a pT3b clear cell RCC in the other case). The incidence of RCC in this series of ADPKD transplant patients was 1.3%.

We have demonstrated that the majority of ADPKD patients do not require NN, with only 20% of our series undergoing this procedure. The timing of NN is variable and dictated by indication. NN was only required to make space for transplantation in one case (combined kidney and pancreas transplant). The main indications for NN were recurrent infection and pain, where NN can provide a successful outcome. Laparoscopic NN can be performed safely in patients with ADPKD. Haematuria in such patients should not be assumed to be of benign origin and requires exclusion of urinary tract malignancy as the incidence of RCC in this population is at least as common as in the general population.

Autosomal dominant polycystic kidney disease (ADPKD) is a dominantly inherited heterogenetic systemic disease occurring in 1:700 to 1:1,000 individuals. It is one of the most common inherited disorders with approximately 12.5 million cases worldwide.1 The development of multiple epithelial-lined kidney cysts results in slowly progressive enlargement of the kidney that leads to chronic kidney disease (CKD) in 50% of patients by the sixth decade.1,2 Cysts can also develop in other organs including the liver (80%), pancreas (10%) and, more rarely, the spleen and seminal vesicles.3 ADPKD is responsible for approximately 6–10% of CKD cases in North America and Europe.46 Patients may present with haematuria, a urinary tract infection (UTI), loin pain, an abdominal mass, CKD or hypertension.

Kidney transplantation is the preferred treatment option in ADPKD patients with CKD. Patients with recurrent infection, intractable loin pain, persistent haematuria and suspected malignancy may require native nephrectomy (NN). There is little consensus on the timing or indications for NN in ADPKD kidney transplant recipients. We have evaluated our single centre series over the last 20 years.

A retrospective review was performed of the kidney transplant and histopathology databases at Guy's and St Thomas' hospitals covering 1988–2008. ADPKD patients who had undergone both kidney transplantation and NN were selected for our case review. Histopathology reports of NN specimens were re-reviewed according to current guidelines by a single consultant renal pathologist. Specific data relating to indication, timing and pathology of NN were collected from patient medical records. Indications for NN were categorised into pain, UTI, haematuria (macroscopic), tumour suspicion (computed tomography findings suggestive of malignancy) and space (for transplantation). Surgical morbidity was categorised using the Clavien system.7 Statistical analyses were performed using chi-squared, Wilcoxon signed-rank and Mann–Whitney U tests to compare categorical variables, with a p-value of <0.05 considered significant.

Between 1988 and 2008, 1,712 adult patients underwent kidney transplantation at our institute and ADPKD was attributed as the cause of CKD in 157 (8%). Of these patients, 79 were female and 78 male; 114 (73%) received a cadaveric kidney transplant and 43 a living donor kidney transplant. NN was performed in 31 patients (20%), (12 female and 19 male, mean age: 49 years). The majority (n=28) had bilateral NN; 10 were performed pre-transplant and 18 post-transplant. The indications for bilateral NN were: haematuria (n=1), tumour suspicion (n=3), recurrent UTI (n=12) and pain (n=12). Three patients underwent unilateral NN. Two of these were performed post-transplant for a recurrent UTI and one (right NN) was performed for space simultaneously with a combined kidney and pancreas transplant.

Fourteen patients (seven male) underwent NN for recurrent UTIs: four pre-transplant, ten post-transplant. Eleven of these patients had resolution of their recurrent UTI immediately after surgery. The other three patients (one male) had documented symptoms and/or positive mid-stream urine cultures after NN, with one patient experiencing a recurrent (≥3) UTI. In these three cases NN was performed pre-transplant in one patient (0.2 years) and post-transplant in two patients (12.5 years and 5.5 years).

There were two cases of renal cell carcinoma (RCC): bilateral pT1a Nx Mx papillary RCCs in one case and a pT3b Nx Mx (Fuhrman grade 2) clear cell RCC in the other. There were five cases with benign renal tumours, five papillary adenomas (two found in one specimen) and one oncocytoma. In contrast, 24 of the 31 cases that underwent NN only showed histological features consistent with ADPKD. The incidence of RCC in this ADPKD transplant series was 1.3%.

The correlation between the indication for NN and the pathological findings is shown in Table 1. Both cases of RCC presented with macroscopic haematuria and had imaging suggestive of a tumour. Two other cases presented with haematuria but only had pathological features of uncomplicated ADPKD. The imaging in one of these cases was suggestive of a tumour. The benign tumours were incidental pathological findings, with NN being performed for either pain or a UTI. Pain and UTIs were the main indications for NN, accounting for 84% of cases.

Table

Table 1 Timing and indication for native nephrectomy (NN) between the pathological groups

Table 1 Timing and indication for native nephrectomy (NN) between the pathological groups

Pathological group Timing of NN Indication for NN
Renal cell carcinoma (n=2) Post-transplant (n=2) 4 and 6 years Tumour suspicion (n=2)
Benign tumour (n=5) Pre-transplant (n=2) UTI (n=2)
Post-transplant (n=3) UTI (n=1)
1, 8 and 17 years Pain (n=2)
Autosomal dominant polycystic kidney disease (n=24) Pre-transplant (n=8) UTI (n=2) Pain (n=5) Haematuria (n=1)
Post-transplant (n=15) 0.5–12.5 years UTI (n=9)
Pain (n=5)
Tumour suspicion (n=1)
Simultaneous (n=1) Space (n=1)

Table 1 also summarises the timing of NN in this series. For the two cases with malignant pathology, NN was performed at four and six years post-transplant. For the benign pathology cases, NN was performed pre-transplant in 10 cases, simultaneously with the transplant in 1 case and post-transplant in 18 cases.

The exposure time to dialysis of the native kidneys with malignant pathological findings was 11 and 12 months. For those with benign tumours, the median exposure time was 12 months (range: 0.5–36 months) and for those with ADPKD findings alone, it was also 12 months (range: 0–78 months).

The surgical technique used for NN in this series was open (midline or rooftop) in the majority (n=26) of cases. In the five most recent cases the kidneys were removed laparoscopically with three hand assisted laparoscopic (HAL) bilateral NNs, one HAL unilateral NN and one total laparoscopic unilateral NN. The paired kidneys in the HAL NN cases were between 20cm and 30cm in length and were extracted via a subumbilical hand port site (Fig 1).

figure parent remove

Figure 1 Hand assisted laparoscopic bilateral native nephrectomy in a renal transplant patient with autosomal dominant polycystic kidney disease. Both native kidneys (21cm long) were removed through a single 7.5cm infraumbilical hand port incision.

The mortality rate for this series was 3% (1/31, Clavien grade 5), with an overall surgical complication rate of 65% (20/31, Clavien grades 1–5). The incidence of surgical complications in patients who underwent open NN was 73% (median: grade 2, range: grades 1–5) and for laparoscopic NN it was 20% (a single grade 4 complication). The average number of complications per patient in the open NN group was 1.1 compared with 0.2 in the laparoscopic NN group.

There was no significant difference in the complication rate between NN performed pre-transplant (65%) and those performed post-transplant (61%) (p=0.55). However, there was a significant difference in the severity of complications between these two groups, with all major complications (grade 3–5) occurring in those NNs performed post-transplant (p=0.034).

The majority of the NNs were performed in an elective setting. There were five emergency open NN cases: one pre-transplant, one simultaneous and three post-transplant. The indications were infection (n=4) and space at the time of a combined kidney and pancreas transplant (n=1). All had postoperative complications. One emergency laparoscopic NN was performed for a UTI; no postoperative complications were noted.

The median length of hospital stay (LOS) after NN in this series was 12 days (range: 5–58 days). For the open NN group the median LOS was 12 days (range: 7–59 days) and for the laparoscopic (HAL/total laparoscopic) NN group the median LOS was 5 days (range: 5–12 days) (p=0.003). For those who underwent emergency open NN, the median LOS was 21.5 days (range: 12–58 days) whereas the LOS for the one emergency laparoscopic NN was 5 days.

There is no clear consensus as to the exact indications or timing for NN in the ADPKD population undergoing transplantation. Most would agree that NN is not routinely indicated in this population, with the majority of patients not requiring NN as demonstrated in our series where 20% of our ADPKD population underwent NN and also those studied by Fuller et al (NN = 19%),8 Cohen et al (NN = 26%),9 Sulikowski et al (NN = 16%)10 and Hadimeri et al (NN = 17%)11 who performed similar numbers (Table 2).

Table

Table 2 Summary of case series performed on native nephrectomy (NN) in autosomal dominant polycystic kidney disease (ADPKD) patients

Table 2 Summary of case series performed on native nephrectomy (NN) in autosomal dominant polycystic kidney disease (ADPKD) patients

Sulikowski et al, 200910 183 ADPKD patients, of whom 50 underwent kidney transplantation between 2000 and 2007
NN performed in 29 patients
Timing of NN: pre-transplant (n=25), simultaneous for space (n=4)
Indications in pre-transplant group: pain, UTI, haematuria, cyst haemorrhage, large kidney size
Hajj et al, 200912 79 ADPKD patients with CKD had NN between 1982 and 2003 (10 bilateral)
Indication: tumour suspicion (n=5), space or benign complications (haematuria, pain, infection)
Histology: RCC (n=10, 5 clear cell carcinomas and 7 tubulopapillary carcinomas)
The prevalence of RCC was found to be higher in patients with ADPKD and CKD, with >1 year on dialysis or kidney transplantation.
Nunes et al, 200913 159 kidney transplant patients with ADPKD
143 patients (90%) had simultaneous unilateral NN at the time of transplant for space
Cohen et al, 20089 145 patients with ADPKD between 1998 and 2006
NN performed in 38 patients
Indication: in preparation for transplant (n=28, 68%), urological complications (n=12), tumour suspicion (n=1)
Lipke et al, 200714 Outcome review of 18 patients with ADPKD who underwent hand assisted laparoscopic bilateral NN
Timing of NN: post-transplant (n=17)
Indication: pain (n=16), recurrent infection (n=2)
Fuller et al, 20058 171 ADPKD patients with CKD between 1992 and 2002
NN performed in 32 transplant patients (25 bilateral)
Timing of NN: pre-transplant (n=7), simultaneous (n=16), post-transplant (n=9)
Indication: pre-transplant for haematuria, pain or mass; simultaneously for space; post-transplant for UTI
Hadimeri et al, 199711 874 kidney transplant patients between 1985 and 1993
114 (13%) for ADPKD
NN performed in 26 patients
Timing of NN: pre-transplant (n=19), post-transplant (n=7)
Indication: pre-transplant for space (n=11), infection/pain/haematuria (n=5), tumour suspicion (n=2), hypertension (n=1); post-transplant for space (n=1)
Keith et al, 199415 25 patients with ADPKD and RCC at Mayo Clinic between 1955 and 1992
3 cases bilateral RCC, 2 cases developed RCC in contralateral kidney, 7 cases of multicentric tumours and 20% had metastases at presentation
There was a higher proportion of sarcomatoid tumour compared to the general population.
Our institute, 2010 157 ADPKD patients between 1988 and 2008 underwent kidney transplantation
NN performed in 31 patients (20%) (28 bilateral)
Timing of NN: pre-transplant (n=10), simultaneous (n=1), post-transplant (n=20)
Indication: haematuria (n=1), tumour suspicion (n=3), UTI (n=14), pain (n=12), space (n=1)
Histology: RCC in 2 cases (incidence 1.3%): 1 bilateral papillary RCC and 1 clear cell RCC

CKD = chronic kidney disease; RCC = renal cell carcinoma; UTI = urinary tract infection

Whereas in those series by Fuller et al, Cohen et al and Hadimeri et al the main indication for NN was to provide space for the transplant, we have shown this to be unnecessary in most cases. Only one patient in our series underwent NN for space; this was for a combined kidney and pancreas transplant where the right kidney was removed to provide space for the pancreas transplant.

The main indications for NN in our series were recurrent infection or intractable pain (84% of cases) and NN was mostly performed post-transplant. Patients are at highest risk of a UTI in the first month post-transplant and it is the most common infection to be reported following kidney transplantation. The reported incidence of post-transplant UTIs varies considerably from 10% to 98%.16 Many factors have been attributed to the increased incidence of UTIs in kidney transplant patients. Transplant ureteric stents and instrumentation of the urinary tract predispose to infection. In this patient series the majority had a transplant ureteric stent for 6–12 weeks before being removed cystoscopically. Immunosuppression is an important risk factor for infection in transplant patients and is at highest levels during the first year post-transplant.

In the three patients with persistent UTIs post-NN, all the infections were noted to occur post-transplant. One was managed by a reduction in immunosuppressant dose, suggesting excessive immunosuppression was a contributing factor. Urinary stasis is also a recognised risk factor for UTIs and incomplete bladder emptying was found to be the cause in one patient with a persisting UTI post-NN. The UTI in this patient resolved after adopting a double voiding regime. Women are predisposed to an increased risk of UTI as seen in our cohort of patients where the main indication for NN in our female population was UTI (58%).

NN performed for UTIs resolved the problem immediately in 75% of our cases and by 1 year post-NN all 14 patients were UTI free. It is important to remember that the cause of UTIs in ADPKD patients is not always in the native kidneys and NN cannot resolve lower urinary tract problems in these patients. This highlights the importance of preoperative investigations and careful patient selection prior to NN. Investigations prior to NN for UTIs should include imaging of the urinary tract, ultrasound measurement of pre- and post-urination bladder volumes, urinary flow rate and and cystoscopy. Occasionally, positron emission tomography – computed tomography is indicated to localise infection to either liver or renal cysts in ADPKD.17

Approximately two-thirds of patients with ADPKD develop micro- or macroscopic haematuria, which is most often due to UTIs, cyst rupture or stone disease.18,19 There has been ongoing controversy as to whether ADPKD is a risk factor for RCC. While the literature is inconclusive with regards to this, it seems that malignancy is at least as common in this subgroup as in the general population.12,15,20 In our study, the incidence of RCC in NN specimens was 1.3%, which is equivalent to that in the general population.2124 The two patients with RCC were aged 53 and 62 years and both presented with macroscopic haematuria. This study confirms that haematuria cannot be presumed to be due to a benign cause in ADPKD patients and that urinary tract malignancy must be excluded.

In addition to the three RCCs (bilateral in one case), histological examination of our NN specimens revealed five papillary adenomas. The concept of a papillary adenoma is controversial and in theory related to a proliferation in tubulopapillary epithelium that has no metastatic potential. Nevertheless, they are very similar histomorphologically to papillary RCCs.25 It has been suggested that as the size of papillary adenomas increases so does the amount of chromosomal alteration and the potential to transform to cancer. This raises the possibility that papillary adenomas and papillary RCCs represent a continuum of the same process. The World Health Organization has defined size criteria to differentiate them, with papillary adenomas being <5mm and carcinomas ≥5mm.26

Acquired cystic kidney disease (ACKD) increases with time on dialysis, affecting approximately 50% of those on dialysis at three years. ACKD is associated with an increased incidence (4–20%) of RCC.2730 In our study, we did not find that the malignant pathological group had spent a longer period on dialysis compared with the benign group. This might suggest that the RCCs did not develop as a result of time spent on dialysis. It is difficult to determine whether ACKD co-exists in ADPKD kidneys with standard histopathology. We were therefore not able to confirm if there were ACKD findings in either the benign or malignant ADPKD groups.

Most studies have shown that unilateral or bilateral NN in ADPKD patients is safe in terms of postoperative morbidity and graft function810,13 and our morbidity and mortality rates compared to those in other series. The one mortality in this series was a patient who underwent NN as part of an emergency laparotomy for overwhelming sepsis. The Clavien classification is a validated system for stratifying surgical complications and enabled complications to be categorised into ‘minor’ (grades 1 and 2) and ‘major’ (grades 3–5).7 As expected, NN in the emergency setting was associated with more severe complications. Interestingly, we found that all of the major complications occurred in those NNs performed post-transplant and may relate to the immune-suppressed state. Avoiding the need for emergency NN, particularly in the post-transplant period when complications appear to be more severe, may reduce the postoperative morbidity, LOS and mortality.

The majority of our nephrectomies were performed with a midline or rooftop open incision. The five most recent cases utilised laparoscopic techniques and, similar to the authors of other studies, we believe that laparoscopic NN techniques show promising benefits in terms of decreased morbidity, blood loss and hospital stay despite being a technically challenging procedure.14,3133 Further studies are needed to confirm the potential benefits of laparoscopy compared with open nephrectomy in this patient group.

The major limitation of this study is that we did not review the records of the 128 ADPKD transplant patients who did not require NN and are therefore unable to comment on the overall incidence of haematuria, infection and pain in these patients.

Haematuria must be investigated fully and promptly in the ADPKD population, as one would for the general population, to exclude a renal tract malignancy. NN is not routinely indicated in ADPKD patients undergoing transplantation but is reserved mainly for those with recurrent infection and pain. The majority of NN performed for UTIs successfully prevented further episodes of infection, demonstrating that in a select group NN can improve morbidity. Studies suggest that the timing of NN does not significantly impact on morbidity or graft survival. Minimally invasive NN surgery appears to be a useful development in ADPKD patients.

To the ADPKD transplant patients at Guy's and St Thomas' hospitals and the medical and nursing staff involved in their care.

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