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Wilms Tumor Protocol Violations: Practice Gap discussion at Update Course 2018

Video Published 2018-09-16 Updated 2023-08-02

Timestops (6)

Case Presentation: Renal Mass with Lung Findings

Wilms Tumor Protocol and Biopsy Approach

Lymph Node Evaluation and Treatment Strategy

Management of Pulmonary Metastases

Single Nodule Treatment Considerations

Primary Nephrectomy in Metastatic Disease

Topic Overview

A case-based discussion of a 2-year-old with a 10 cm unilateral renal mass and multiple lung lesions, focusing on two critical practice gaps in Wilms tumor management: the mandatory requirement for lymph node sampling during nephrectomy (failure to document histologically negative nodes results in upstaging and increased chemotherapy), and the principle that metastatic pulmonary disease does not preclude primary nephrectomy when the kidney can be removed without resecting other organs, because local staging determines radiation therapy requirements independent of systemic stage. The discussion contrasts US COG protocols (upfront nephrectomy) with European SIOP protocols (percutaneous biopsy followed by neoadjuvant chemotherapy) and addresses management of pulmonary nodules, including the criteria for biopsy versus empiric treatment and the requirement for complete radiographic resolution to avoid lung radiation.

Key Takeaways

Lymph node sampling is mandatory in Wilms nephrectomy; undocumented nodes are assumed positive, upstaging disease and increasing chemo. (1:54)
Primary nephrectomy should proceed despite lung mets if kidney removable without other organs—local stage drives radiation decisions. (4:07)
Biopsy of primary Wilms counts as local spillage requiring flank radiation; upfront nephrectomy avoids this even in stage 4 disease. (4:44)
Lung nodule resolution after 6 weeks of chemo avoids pulmonary radiation; residual nodules require biopsy to distinguish scar from tumor. (7:18)
Multiple lung nodules can be presumed metastatic without biopsy; single nodules may need biopsy if radiographic criteria atypical. (5:20)

Inside this episode

Kai, the Library's AI content creator, listened to this episode and mapped who's speaking, the chapters, key claims, and cases. Every item links to the exact moment in the recording.

AI-enriched

Who's speaking

Speaker 1 — host
Speaker 2 — host
Ken Wong — guest
David — guest
Speaker 5 — guest
Dan — guest

Chapters

0:01Case Presentation and Audience Polling — A 2-year-old with 10 cm unilateral renal mass and multiple lung lesions is presented. Audience polling reveals split opinion between nephroureterectomy with lymph node sampling versus renal biopsy followed by chemotherapy.
1:52Lymph Node Sampling Requirement and Protocol Differences — Discussion of the mandatory requirement for lymph node sampling during Wilms nephrectomy per US protocols, with comparison to European SIOP approach. Addresses the identified practice gap and staging implications of undocumented lymph nodes.
4:33Management of Pulmonary Metastases — Debate on whether metastatic lung disease should change primary tumor management, criteria for lung nodule biopsy, and the distinction between local and systemic staging in determining radiation therapy.
7:12Resolution Criteria and Educational Impact — Discussion of radiographic resolution requirements to avoid lung radiation, comparison with SIOP percutaneous biopsy approach, and note of improvement in lymph node sampling rates following educational efforts.

Key claims

1:54When doing a nephrectomy for Wilms tumor, lymph nodes must be sampled according to protocols — Speaker 1
2:01If lymph nodes are not documented as histologically negative, they are assumed to be positive, which bumps up the stage and requires increased chemotherapy — Speaker 1
2:19Failure to sample lymph nodes during Wilms nephrectomy is an identified practice gap by the Cancer Committee and COG publications — Speaker 1
2:30The management approach is based on US protocols as opposed to European SIOP protocols — Speaker 1
3:23In Hong Kong, they tend to go with the American protocol for Wilms tumor but use either European or American protocols for various other tumors — Ken Wong
4:07Just because you have metastatic disease in the lung doesn't mean you shouldn't treat the primary with a nephrectomy — Speaker 1
4:20Primary nephrectomy changes whether or not the patient will get radiation therapy — Speaker 1
4:26There is a local stage for Wilms tumor and a patient staging for Wilms tumor — Speaker 1
4:33On the ACS pediatric surgery blog, overwhelmingly the presence of lymph node mets meant people did biopsy and chemotherapy, which is incorrect — Speaker 1
4:44Regardless of pulmonary metastatic disease, if you think you have a primary that can come out without removing other organs, you should do that because it decreases radiation therapy — Speaker 1
5:04The child will get metastatic stage 4 chemotherapy no matter what, but biopsy counts as local spillage and requires radiation therapy to the flank or abdomen — Speaker 1
5:17You should treat local disease differently than systemic disease — Speaker 1
5:20Whether to biopsy lung masses depends on how many are present; with multiple lesions, a correct assumption of metastatic disease can be made — Speaker 1
5:45Oncologists want measurable disease to see if it responds to chemotherapy — Speaker 1
6:03If you treat the patient and lung nodules go away, you presume that is metastatic disease; if there is a residual nodule after treatment, that is an indication to resect it — Dan
6:24Previously, if a nodule wasn't present on plain film, it didn't matter even if seen on CT, but now CT is the diagnostic test of choice and impacts therapy — Dan
6:41For single nodules, patients are treated and if the nodule resolves, it is presumed to be metastatic Wilms tumor — Dan
6:54There are radiographic criteria for single nodules; if it looks like a met you treat it, if it doesn't look like a met you can biopsy it to prove it's not a met and avoid chemotherapy — Speaker 1
7:12What you avoid with nodule resolution is radiation therapy to the lungs, not chemotherapy — Dan
7:18If after 6 weeks lung nodules have resolved regardless of number, there is no radiation to the lungs — Dan
7:43To avoid radiation, lung nodules have to disappear; if there is a residual nodule you don't know if it's scar or active tumor and have to biopsy — Dan
7:58Nodules have to resolve to avoid radiation therapy — Dan
8:01In SIOP protocols, they do a percutaneous biopsy of the tumor and treat with chemotherapy — Speaker 2
9:29APSA has addressed the lymph node sampling practice gap through expert questions, educational efforts at annual meetings, and the American College of Surgeons registry has seen improvement with fewer patients getting nephrectomies without lymph node sampling — Speaker 1

Cases discussed

0:012-year-old asymptomatic female with unilateral 10 cm left renal tumor and multiple bilateral lung lesions

Points of disagreement

0:48Initial management approach for metastatic Wilms tumor
- Half favored left nephroureterectomy with lymph node sampling, half favored renal biopsy followed by adjuvant chemotherapy
- Speaker 1: Primary nephrectomy with lymph node sampling is correct even with metastatic disease
- Speaker 5: Questioned the value of lymph node sampling when metastases already present in lung
5:20Management of single versus multiple lung nodules
- Speaker 1: Multiple nodules can be assumed metastatic; single nodules may require biopsy depending on radiographic appearance
- Dan: Treat empirically and if nodules resolve, presume metastatic disease; biopsy only if residual after treatment

Open questions

What are the specific radiographic criteria for single lung nodules that determine whether biopsy is needed versus empiric treatment?
For a single lung nodule that doesn't look like a metastasis, what is the exact threshold for proceeding with biopsy versus treatment?
In cases with 1-2 lung nodules in a single lobe, should these be biopsied or resected at the time of nephrectomy?

This episode was analyzed and enriched by Kai, the Library's AI content creator. Every item links to the moment it comes from — click a timestamp to listen in context.

Wilms Tumor with Pulmonary Metastases: When Upfront Nephrectomy Still Matters

The patient case from this episode, retold from presentation to outcome with the decisions made along the way. Written by Kai from the episode transcript and reviewed before publishing.

For the care team · Case narrative · AI-written, human-reviewed

The Presentation

A 2-year-old girl, otherwise well, presented with a 10 cm left renal mass and multiple bilateral pulmonary nodules on CT 0:01. The kidney tumor was clearly resectable without sacrificing adjacent organs. The question was whether to proceed directly to nephrectomy with lymph node sampling or to biopsy the kidney and start chemotherapy.

The Decision Point

The presence of lung metastases creates a cognitive trap. The child has stage IV disease regardless of what you do to the kidney. She will receive stage IV chemotherapy no matter which path you choose. The instinct — reflected in the audience split and in responses to similar cases on the ACS pediatric surgery blog — is that once metastatic disease is present, local control of the primary becomes less urgent 4:33. Why not biopsy, confirm the diagnosis, and let chemotherapy work systemically?

The answer lies in understanding that Wilms tumor has both a local stage and a patient stage 4:26. These are tracked separately because they drive different treatment decisions. Metastatic disease determines systemic chemotherapy. Local disease determines radiation therapy. A biopsy of the primary tumor counts as local spillage, which mandates radiation to the flank or abdomen 5:04. A clean nephrectomy avoids that radiation entirely, even in the presence of distant metastases 4:44.

The correct approach is nephrectomy with lymph node sampling 0:01. The child receives the same stage IV chemotherapy either way, but you have eliminated one toxicity — abdominal radiation — by treating the primary surgically rather than with a needle [c10, c11].

The Lymph Node Requirement

Lymph node sampling during Wilms nephrectomy is not optional. If nodes are not documented as histologically negative, protocols assume they are positive, which increases the stage and intensifies chemotherapy 2:01. This remains a persistent practice gap despite educational efforts by APSA, the Cancer Committee, and COG 2:19. The American College of Surgeons registry has documented improvement since these efforts began, but the gap has not closed 9:29.

The Lung Nodules

Multiple bilateral nodules can be presumed metastatic without biopsy 5:20. Oncologists want measurable disease to assess chemotherapy response 5:45. The nodules are treated, and their behavior determines the next step. If they resolve after six weeks of chemotherapy, radiation to the lungs is avoided regardless of how many nodules were present initially 7:18. If a nodule persists, it must be biopsied or resected because you cannot distinguish scar from viable tumor 7:43. To avoid pulmonary radiation, the nodules must disappear 7:58.

Single nodules are more complex. Radiographic criteria exist: if the nodule looks like a metastasis, it is treated as one; if it does not, biopsy can prove it benign and avoid unnecessary chemotherapy 6:54. CT is now the diagnostic standard — nodules visible only on CT but not on plain film were once disregarded, but that practice has changed 6:24. For single nodules treated presumptively, resolution with chemotherapy confirms the diagnosis retrospectively 6:41.

What the Case Changes

The transferable judgment is this: treat local disease and systemic disease as separate problems, even when they coexist in the same patient 5:17. A resectable primary should be resected, not biopsed, because biopsy adds a toxicity — radiation — without changing the systemic therapy the child will receive [c10, c11]. The presence of metastatic disease does not make the primary irrelevant; it makes the choice of local therapy more consequential.

This reasoning is specific to US protocols 2:30. In SIOP protocols, percutaneous biopsy of the primary tumor followed by chemotherapy is standard 8:01. In Hong Kong, the American protocol is followed for Wilms tumor, though European or American protocols may be used for other pediatric malignancies depending on the case 3:23.

Takeaways from this story

Biopsy of a resectable Wilms primary counts as spillage and mandates abdominal radiation even with distant metastases present.
Undocumented lymph nodes are assumed positive by protocol, upstaging the patient and intensifying chemotherapy unnecessarily.
Pulmonary nodules that resolve after six weeks of chemotherapy allow avoidance of lung radiation regardless of initial number.
Local and patient staging in Wilms tumor are tracked separately because they determine different treatment decisions.

Keywords

Wilms tumor metastatic renal tumor pulmonary metastases nephroureterectomy lymph node sampling renal biopsy partial nephrectomy percutaneous biopsy lung biopsy COG SIOP APSA American College of Surgeons ACS pediatric surgery blog

Hashtags

#WilmsTumor #PediatricOncology #SurgicalStaging #ProtocolCompliance

Transcript

A 2 year old, otherwise asymptomatic female presents with a unilateral 10 centimeter renal tumor in the left kidney. In addition to identifying the renal mass, computerized tomography reveals multiple lesions in both lungs. The next best step in management of this patient with a metastatic renal tumor is. Open, we're hearing lots of hums up here already. We haven't even talked about the open renal and lung biopsy. Renal biopsy followed by adjuvant chemotherapy. Left total nephroureterectomy, left total nephroureterectomy with retroperal lymph node sampling, and left partial nephrectomy. I'll say that this is a practice gap that's been identified not just by the Absent Cancer Committee, but documented in the literature as well. You go right to the answer or give it a little, you're watching the polls. Well, what's fun about the polls is when you first look at the polls here in our studio yeah, we're 30 seconds ahead. So what you see is a sampling of people in this room, and then if you wait about 30 seconds, you see the rest of the world and the polls always change. So the wisdom of the group is wisdom of the crowd here. David, I recall doing the nephroureterectomy and making a hole in the diaphragm and biopsying. Or taking out lung lesions, closing the. Well, well, we can, we can have that discussion too. That's there are going to be two kind of learning points for this question. I think we're far enough along. It's pretty split. Yeah. Half the audience, half the audience said left nephro left nephroureterectomy with lymph node sampling, and the other half said renal biopsy followed by adjuvant chemotherapy. So let's, as I said, there's kind of two learning objectives here. The first is that When you're doing a nephrectomy for Wilm's tumor, you have to sample lymph nodes. You just have to. According to the protocols, if you don't document histologically negative lymph nodes, they're kind of assumed to be positive, that bumps up the stage, and that requires chemotherapy or increases your chemotherapy for that. So you really need to take lymph nodes if you're going to do a nephrectomy for Wilms tumor. That's an identified practice gap, as I say, by the Cancer Committee, by the COG publications, and that just needs to change. It's not that big a deal. I think it's important to mention though that. This question is based in the US with our protocols as opposed to to Europe where colleagues have PIO and there may be other organizations. So anyway, it's I'd be interested in follow up on a tumor this size for those who are on psyop protocols so they do differently. The other learning objective I think they biopsy everything. I think I don't, I never hear back. I don't know. Ask. Let's ask. I don't know. Did Davenport ever comevan still on the. I would love to get, uh, so David or Giovanna or Ken, actually, I'm curious, uh, your thoughts on this question. So let's first start with uh Ken Wong. For this, uh, for this kid, I, I would be with the specialist, uh, taking the kidney out and also do the lymph node sampling. Um, so on, on Wilms tumor, we tend to go with the Americans sort of protocol, but we in Hong Kong, with various tumors, we, we, uh, we go with either Europeans or Americans. We don't stick with one group or the other group. So we just But this one Americans. OK. All right, David. Uh, I have to admit I don't do oncology, but, uh, I think I would go for a biopsy and lymph node. OK. All right, so I, I, I guess the problem I had with the question was that if they've got uh Lymph node sampling if they already have meds in the lung. Excellent segue. So the other, the second learning point here is that just because you have lymph nodes, or you have metastatic disease in the lung doesn't mean you shouldn't treat the primary with a nephrectomy. Because that changes whether or not you're going to get radiation therapy as well. So as Dr. Ehrlich would point out, there's kind of a local stage for Wilms's tumor, and then there's a patient staging for Wilms's tumor. And this a question just like this came up on the ACS pediatric surgery blog, and overwhelmingly the presence of lymph node mets meant people did biopsy. And and chemotherapy, which is incorrect, regardless of the presence of pulmonary metastatic disease, if you think you have a primary that can come out without removing other organs, you should do that as well because it decreases the radiation therapy and the lymph node and the lung that's probably will get treated. Correct, chemotherapy. The child's going to get the metastatic stage 4 chemo no matter what, but it changed once you do the biopsy, then that counts as local spillage and you require radiation therapy, you know, to the flank of the abdomen depending on what happens. So you should treat the local disease different than the systemic. What happened to the Uh, idea that you need to biopsy with the lung masses depends on my, my impression is to confirm that there's metastatic depend depends on how many are there. This child had multiple, so I think they can make a, make a correct, correct assumption that's a meth. And what, what Mac was getting at, what if you have 11 in the lower lobe in the lower lobe. Well, and what the, what the oncologists want is measurable disease to see if it responds to chemotherapy. What the surgeons kind of want is to document it or to get it out. So I'm not sure I know the right answer to that. Treat the patient and they go away, then you presume that that's metastatic disease. If you treat them and there's a residual nodule, then that's an indication to go resect that. How about for just one nodule, for just even with just one nodule, you treat it without a biopsy, and it's CT CT persistence. Right or not. Yeah, and right, so we used to say if it wasn't present on a plane film, you didn't care about it. It wasn't present even if you saw something on CT, but now I believe CT is the diagnostic test of choice. And so that impacts your therapy. The single nodule question is a good one. I don't want to misinform people on what that is, but I believe that um. That those patients are treated and if it resolves, then you presume that that was metastatic Wilm's tumor. When I last discussed this with Dr. Shamberger, there were not specific, but there were radiographic criteria for that single nodule. And if you thought, if it looked like a met. You just. If it didn't look like a met, you could biopsy it, prove that it was not a met, and that avoided the chemotherapy. Well, I think to everybody's previous comment, what you, what you avoid is the radiation therapy to the lungs. So if after 6 weeks, the lung nodules have resolved regardless of how many there are, then you don't give, there is no radiation to the lungs. And Dan, actually I want to, so I have a question for you, and then Giovanna had a comment when they do. Resolve after chemotherapy, do they leave a scar that you still end up needing to biopsy, or do they usually just disappear? Typically, I mean in order to avoid radiation, they have to disappear. If there's residual nodule, then you don't know whether it's a scar or active tumor. Then you have to biopsy. So if it goes substantially or you just or they just continue on with therapy and they get the radiation therapy. They have to resolve to avoid the radiation therapy. Giovanna just wanted to reiterate that in psyop they do a percutaneous biopsy and treat with chemotherapy, which is Of the tumor or of the lung the tumor of the tumor itself. Very good. Who's next? Do we cover all the take-home points. Yeah, that's a great point. So what's the, what's the, the tweet? Two take-home points are, uh, if you're doing a nephrectomy for William's tumor, remember to take lymph nodes and that there is both a local and a systemic staging in the United States. And just because there's pulmonary metastases doesn't mean you shouldn't do a primary nephrectomy. Yeah, I think I would and you wouldn't biopsy the, the, um, lung nodules, you say that last part again. If there is a, uh, Dave, what you just said, you're the last part of so that the presence of pulmonary metastasis should not in the United States should not prevent you from doing a primary nephrectomy. Just because of that metastatic disease, if you think you can take it out without taking out other organs. Yeah, and uh a little plug for uh Peter Ehrlich did a great podcast on Wilm's tumor and it's, if you go, we can, it's actually, we can give you the link to that and you can listen to it. He goes into great detail in exactly this point. So, uh. I'll find the link right now and post it. I will share that this has been something that APSA has hit really hard with expert questions and NAT and trying to do things at annual meetings, and I've been informed that the college has the American College of Surgeons is kind of keeping track of the registry stuff here and has seen some improvement in, has seen fewer patients getting nephrectomies without lymph node sampling since we started doing some of these educational efforts. Our next question.

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