Menu
Not yet recruiting NCT04670887

Comparison of Surgery and Active Surveillance in the Treatment of Bosniak III Renal Cysts

No phase Interventional Cystic Renal Disease Kidney Cancer Surgery

For patients and families

In plain language

An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.

What is being studied
The protocol lists: Delayed surgery, Immediate surgery.
Who it may be relevant to
Registry conditions: Cystic Renal Disease, Kidney Cancer, Surgery. Basic parameters: 50 years — 75 years · All.
What needs checking
Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
Where it takes place
Center list to be confirmed — check the primary protocol.
Next step
Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →

Unsure about the terms? Read our patient guide →

Official title

A Prospective Multicenter Trial Comparing Surgery Versus Active Surveillance In Patients With Bosniak 3 Renal Cystic Masses, A NoRenCa And FinnKidney Study

Overview

The incidence of renal cysts is rising due to increased abdominal imaging. Renal complicated cysts have been traditionally classified according to the Bosniak classification, which distinguishes cystic masses by specific features of walls and septa. The categories I and II are benign and class IIF most probably benign but needs a short radiological follow-up. Categories III and IV have been traditionally operated due to the increased risk of renal cell carcinoma. However, recently published studies show that approximately 50% of the operated Bosniak III cystic masses are benign, which means that half of the cases are overtreated by surgery. It has also been shown that surgical pathology of stable Bosniak IIF cysts is malignant in less than 1%, while the cysts, which are upgraded to higher Bosniak classes will show malignant surgical pathology in 85%. So far, there is lack of prospective data on active surveillance in Bosniak III cystic masses. The aim of the study is to compare active surveillance and surgery in patients with Bosniak III renal cystic masses. Patients will be randomized in active surveillance or immediate surgical excision of a cystic mass. In the active surveillance group, patients are followed according to the study protocol for 10 years and treated with delayed surgery if the cystic mass upgrades into Bosniak IV/solid, becomes symptomatic or grows over a preclassified threshold. The primary objective is to compare surgical pathology between patients treated with immediate surgery versus delayed surgery. According to recent retrospective data, active surveillance of Bosniak III cystic masses is reasonable and oncologically safe. Therefore a prospective randomized controlled trial is needed to get high level evidence to support a change in the treatment strategy. The study may significantly reduce unnecessary operations performed in patients with Bosniak III cystic masses.

Interventions

  • Procedure Delayed surgery
    Delayed surgery is performed if cystic mass radiologically upgrades into Bosniak 4 or solid mass in the active surveillance.
  • Procedure Immediate surgery
    Partial or radical nephrectomy is performed as treatment of Bosniak 3 cystic mass

Primary outcome measures

  • Malignancy rate in surgical pathology [Time frame: From date of randomization until the date of surgery, assessed up to 120 months]
Secondary outcome measures (3)
  • Cancer specific survival [Time frame: From date of randomization until the date of death due to renal cancer, assessed up to 120 months]
  • Progression-free survival [Time frame: From date of randomization until the date of first documented progression, assessed up to 120 months]
  • Overall survival [Time frame: From date of randomization until the date of death from any cause, assessed up to 120 months]

Eligibility criteria

Inclusion criteria

  • A sporadic single CM of Bosniak 3 according to the Bosniak Classification v.2019 is diagnosed with CT or MRI
  • Maximal diameter of CM 10-70 mm
  • Age ≥50 years
  • ECOG performance status <2
  • Life expectancy ≥5 years
  • Patient is fit to undergo surgery and AS.
  • Patient understands a national language or English
  • Signed informed consent

Exclusion criteria

  • Genetic syndromes associated with RCC
  • Previously or simultaneously diagnosed and pathologically verified RCC
  • Previously or simultaneously radiographically identified solid mass or CM of Bosniak 3/4 with diameter ≥10mm
  • The target CM of Bosniak 3 has progressed in sequential imaging from Bosniak 1-2F
  • Presence of radiographic findings which are suspect for nodal or distant metastatic disease
  • Symptomatic CM
  • Kidney insufficiency (GFR<55 ml/min/1,73m2)
  • Patients who have contraindications for both CT and MRI imaging. . Anatomically solitary kidney

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: No

Study design

Allocation
Randomized
Model
Parallel assignment
Masking
Open label
Primary purpose
Treatment

Study locations

Center list to be confirmed — check the primary protocol.

Identifiers

NCT: NCT04670887 · HUS/1556/2020

Primary sources (government registries)

View this study on ClinicalTrials.gov ↗