Purpose
This study aimed to explore the significance of 68Ga-pentixafor PET/CT in guiding surgical treatments for primary aldosteronism (PA) patients, by identifying functional lesions and determining the dominant side of aldosterone secretion.
Materials and methods
We prospectively included 91 PA patients receiving surgical treatments based on the results of 68Ga-pentixafor PET/CT. The 68Ga-pentixafor PET/CT images were evaluated by visual and semi-quantitative analysis. The relationship between radionuclide imaging characteristics and postoperative outcomes was assessed following surgery.
Results
The positive detection rate of 68Ga-pentixafor PET/CT in 91 PA patients was 85.7 % (78/91) with a median maximum standardized uptake value (SUVmax) of 10.2 (6.0–16.0). The SUVmax was positively correlated with lesion diameter (r = 0.497, P < 0.001), while negatively correlated with the blood potassium level (r = -0.450, P < 0.001) and plasma renin activity (r = -0.297, P = 0.004). 63 cases of 73 PA patients with unilateral adrenal lesion were identified positive by 68Ga-pentixafor PET/CT, and 95.2 % of the 63 positive cases benefited from surgical resection of the identified positive lesions. Among 18 PA patients with bilateral lesions, 68Ga-pentixafor PET/CT identified positive lesions in 15 cases, and 86.7 % (13/15) of the positive cases benefited from total or partial adrenalectomy guided by 68Ga-pentixafor PET/CT. There was no significant difference in postoperative outcomes between patients undergoing partial adrenalectomy with those subjected to total adrenalectomy. The accuracy rate of 68Ga-pentixafor PET/CT in determining the dominant side of aldosterone secretion for PA was 85.7 %, which was comparable to the 71.4 % of adrenal vein sampling (AVS).
Conclusions
68Ga-pentixafor PET/CT could effectively guide the surgical management for PA patients, achieving favorable postoperative outcomes. The accuracy rate of 68Ga-pentixafor PET/CT in identifying the dominant side of aldosterone secretion was not inferior to that of AVS.