Small Renal Mass Surveillance: Histology-specific Growth Rates in a Biopsy-characterized Cohort.

European Urology
Antonio FinelliMichael A S Jewett

Abstract

Most reports of active surveillance (AS) of small renal masses (SRMs) lack biopsy confirmation, and therefore include benign tumors and different subtypes of renal cell carcinoma (RCC). We compared the growth rates and progression of different histologic subtypes of RCC SRMs (SRMRCC) in the largest cohort of patients with biopsy-characterized SRMs on AS. Data from patients in a multicenter Canadian trial and a Princess Margaret cohort were combined to include 136 biopsy-proven SRMRCC lesions managed by AS, with treatment deferred until progression or patient/surgeon decision. Growth curves were estimated from serial tumor size measures. Tumor progression was defined by sustained size ≥4 cm or volume doubling within 1 yr. Median follow-up for patients who remained on AS was 5.8 yr (interquartile range 3.4-7.5 yr). Clear cell RCC SRMs (SRMccRCC) grew faster than papillary type 1 SRMs (0.25 and 0.02 cm/yr on average, respectively, p =  0.0003). Overall, 60 SRMRCC lesions progressed: 49 (82%) by rapid growth (volume doubling), seven (12%) increasing to ≥4 cm, and four (6.7%) by both criteria. Six patients developed metastases, and all were of clear cell RCC histology. Limitations include the use of different imaging modalities and ...Continue Reading

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Citations

Jan 17, 2021·World Journal of Urology·Giacomo RebezM Carmen Mir
Jan 27, 2021·World Journal of Urology·Teele KuuskAxel Bex
Feb 17, 2021·World Journal of Urology·Kristen McAlpine, Antonio Finelli
Feb 23, 2021·World Journal of Urology·Jean CourcierAlexandre Ingels
Jul 22, 2021·AJR. American Journal of Roentgenology·Robert G RasmussenIvan Pedrosa
Aug 27, 2021·Scientific Reports·Alexandre IngelsJean-Christophe Bernhard

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