Apparent diffusion coefficient: An associative factor for recurrence after nephrectomy in localized renal cell carcinoma

Akihiro Nishie, Daisuke Kakihara, Yoshiki Asayama, Kosei Ishigami, yasuhiro ushijima, Yukihisa Takayama, Daisuke Okamoto, nobuhiro fujita, Koichiro Morita, yuichiro kubo, Junichi Inokuchi, Hiroshi Honda

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Abstract

Purpose To investigate whether the apparent diffusion coefficient (ADC) of a tumor is associated with recurrence after nephrectomy in renal cell carcinoma (RCC) Materials and Methods We retrospectively studied 49 patients with localized RCC who underwent 1.5T magnetic resonance imaging (MRI) including diffusion-weighted imaging preoperatively. Fifteen patients had recurrent disease after surgery. The ADC was measured by placing a region-of-interest in a solid region of each tumor on the ADC map. We named the average value of the three ADC values the "average ADC" and the lowest ADC value among the three as the "minimum ADC." The correlations between clinicopathological factors including patient age and gender, tumor side, tumor size, growth/invasion pattern, Fuhrman grade, histological subtype, venous invasion, average and minimum ADCs, and disease-free survival were analyzed by Cox proportional hazards model. Results In univariate analysis, tumor size, venous invasion, mean ADC, and minimum ADC showed significant correlations with disease-free survival (P < 0.05). In multivariate analysis, only venous invasion and minimum ADC were significant (P < 0.05). The 5-year disease-free survival rate of the low minimum ADC group was 51.6%, while that of the high minimum ADC group was 85.1%. Conclusion The minimum ADC of a tumor, although not as pronounced as venous invasion, was found to be an independent associative factor for recurrence after nephrectomy in patients with localized RCC.

Original languageEnglish
Pages (from-to)166-172
Number of pages7
JournalJournal of Magnetic Resonance Imaging
Volume43
Issue number1
DOIs
Publication statusPublished - Jan 1 2016

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Nephrectomy
Renal Cell Carcinoma
Recurrence
Disease-Free Survival
Neoplasms
Diffusion Magnetic Resonance Imaging
Proportional Hazards Models
Multivariate Analysis
Survival Rate

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging

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Apparent diffusion coefficient : An associative factor for recurrence after nephrectomy in localized renal cell carcinoma. / Nishie, Akihiro; Kakihara, Daisuke; Asayama, Yoshiki; Ishigami, Kosei; ushijima, yasuhiro; Takayama, Yukihisa; Okamoto, Daisuke; fujita, nobuhiro; Morita, Koichiro; kubo, yuichiro; Inokuchi, Junichi; Honda, Hiroshi.

In: Journal of Magnetic Resonance Imaging, Vol. 43, No. 1, 01.01.2016, p. 166-172.

Research output: Contribution to journalArticle

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N2 - Purpose To investigate whether the apparent diffusion coefficient (ADC) of a tumor is associated with recurrence after nephrectomy in renal cell carcinoma (RCC) Materials and Methods We retrospectively studied 49 patients with localized RCC who underwent 1.5T magnetic resonance imaging (MRI) including diffusion-weighted imaging preoperatively. Fifteen patients had recurrent disease after surgery. The ADC was measured by placing a region-of-interest in a solid region of each tumor on the ADC map. We named the average value of the three ADC values the "average ADC" and the lowest ADC value among the three as the "minimum ADC." The correlations between clinicopathological factors including patient age and gender, tumor side, tumor size, growth/invasion pattern, Fuhrman grade, histological subtype, venous invasion, average and minimum ADCs, and disease-free survival were analyzed by Cox proportional hazards model. Results In univariate analysis, tumor size, venous invasion, mean ADC, and minimum ADC showed significant correlations with disease-free survival (P < 0.05). In multivariate analysis, only venous invasion and minimum ADC were significant (P < 0.05). The 5-year disease-free survival rate of the low minimum ADC group was 51.6%, while that of the high minimum ADC group was 85.1%. Conclusion The minimum ADC of a tumor, although not as pronounced as venous invasion, was found to be an independent associative factor for recurrence after nephrectomy in patients with localized RCC.

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