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  • Title: Genotype-Clinical Correlations in Polycystic Kidney Disease with No Apparent Family History.
    Author: Sekine A, Fujimaru T, Hoshino J, Suwabe T, Oguro M, Mizuno H, Kawada M, Sumida K, Hiramatsu R, Hasegawa E, Yamanouchi M, Hayami N, Mandai S, Chiga M, Kikuchi H, Ando F, Mori T, Sohara E, Uchida S, Sawa N, Takaichi K, Ubara Y.
    Journal: Am J Nephrol; 2019; 49(3):233-240. PubMed ID: 30820006.
    Abstract:
    BACKGROUND: Genetic characteristics of polycystic kidney disease (PKD) patients without apparent family history were reported to be different from those with a positive family history. However, the clinical course of PKD patients with no apparent family history is not well documented in the literature. METHODS: We evaluated the relationship between genotype and the clinical course of 62 PKD patients with no apparent family history. RESULTS: The annual decline of renal function was faster in the patients with PKD1/PKD2 mutation (PKD1 truncating [-3.08; 95% CI -5.30 to -0.87, p = 0.007], PKD1 nontruncating [-2.10; -3.82 to -0.38, p = 0.02], and PKD2 [-2.31; -4.40 to -0.23, p = 0.03]) than in the other patients without PKD1/PKD2 mutation. Similar results were obtained after adjustment for gender, age, estimated glomerular filtration rate (eGFR), height-adjusted total kidney volume (TKV), and mean arterial pressure (MAP). There was no significant difference in the annual decline of renal function among the different PKD1/PKD2 groups, but Kaplan-Meier analysis showed that progression to eGFR < 15 mL/min/1.73 m2 was significantly faster in PKD1 truncating group (p = 0.05). The annual rate of TKV increase was larger in the patients with PKD1/PKD2 mutation (PKD1 truncating [4.63; 95% CI 0.62-8.64, p = 0.03], PKD1 nontruncating [3.79; 0.55-7.03, p = 0.02], and PKD2 [2.11; -1.90 to 6.12, p = 0.29]) than in the other patients without PKD1/PKD2 mutation. Similar results were obtained after adjustment for gender, age, eGFR, and MAP. CONCLUSION: Detection of PKD1/PKD2 mutation, especially PKD1 truncating, is useful for predicting the renal outcome and rate of TKV increase in PKD patients with no apparent family history.
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