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68Ga-PSMA联合18F-FDG PET/CT显像在转移性前列腺癌患者中的应用探讨

Clinical Value of Dual Tracer PET Imaging With 68Ga-PSMA and 18F-FDG in Patients With Metastatic Prostate Cancer

  • 摘要:
    目的 本研究回顾性收集进行68镓(68Ga)-前列腺特异性膜抗原(prostate specific membrane antigen, PSMA)和18氟(18F)-代脱氧葡萄糖(flurodeoxyglucose, FDG)正电子发射计算机断层成像(PET/CT)显像的转移性前列腺癌(metastatic PCa, mPCa),分析双示踪剂摄取模式,影响病灶摄取18F-FDG的临床病理学参数及影响前列腺特异性抗原(prostate specific antigen, PSA)-无进展生存期(progression-free survival, PFS)的预后分析。
    方法 回顾性纳入2021年9月–2024年1月间于我院行68Ga-PSMA 及18F-FDG PET/CT双示踪剂显像的41例mPCa。除外1例PSMA、FDG双阴性摄取,基于是否存在FDG阳性病灶,将剩余40例分为两组:Group A(PSMA、FDG双阳性组和FDG单阳性组,33例);Group B(PSMA单阳性组,7例)。比较Group A和Group B组间临床病理学特点。通过Kaplan-Meier法分析不同参数与PSA-PFS的关系。
    结果 26例(63.4%)患者为转移性去势抵抗性PCa(metastatic castration-resistant PCa, mCRPC),Gleason 评分 8~9 分38例(92.7%),远处转移以骨骼转移(36例,87.8%)为主。骨骼及远处淋巴结转移灶多表现为PSMA、FDG双阳性摄取模式〔85.7%(24/28),81.8%(9/11)〕;在脏器转移灶中,37.5%(3/8)存在FDG单阳性的摄取模式。Group A血清PSA水平高于Group B(P=0.013)。13例特殊病理类型(导管内癌和神经内分泌分化)患者均在Group A。41例患者中,16例患者失访。25例完成随访的患者中9例患者发生PSA进展,PSA中位值为104 ng/mL;16 例患者无PSA进展,PSA中位值为0.34 ng/mL,两组间PSA中位值差异有统计学意义(P<0.001)。Kaplan-Meier生存分析显示特殊病理类型中位PSA-PFS(7个月) 短于经典型PCa(16个月),两组间差异有统计学意义(P=0.043);Group A中位PSA-PFS为30个月,Group B仍有超过一半的个体尚未发生PSA进展,中位PSA-PFS尚未达到(P=0.645)。
    结论 mPCa多表现为68Ga-PSMA和18F-FDG双示踪剂摄取,血清PSA水平是预测病灶FDG阳性的可靠指标。存在导管内癌及神经内分泌分化的mPCa病灶易表现为FDG阳性且出现PSA进展。

     

    Abstract:
    Objective In this study, we retrospectively analyzed the imaging characteristics of dual-tracer 68Ga-prostate specific membrane antigen (PSMA) and 18F-flurodeoxyglucose (FDG) positron emission tomography (PET)/computed tomography (CT) in metastatic prostate cancer (mPCa) patients. We analyzed the uptake modes of the dual tracers, explored clinical pathological parameters affecting the 18F-FDG uptake in the lesions, and evaluated their prognostic implications for prostate specific antigen progression-free survival (PSA-PFS).
    Methods A total of 41 mPCa patients who underwent dual-tracer PET/CT (68Ga-PSMA and 18F-FDG) scans between September 2021 and January 2024 were retrospectively enrolled. One patient had negative uptake of both PSMA and FDG. According to the uptake patterns of the 2 tracers, the other patients, 40 in total, were categorized in 2 groups, including group A consisting of 33 cases who showed PSMA and FDG dual and those who showed FDG only avidity, and group B consisting of 7 cases who showed PSMA avidity only. Comparative analyses of clinical pathological characteristics between group A and group B were conducted. The relationship between various parameters and PSA-PFS was analyzed by the Kaplan-Meier method.
    Results A total of 26 patients (63.4%) were diagnosed with metastatic castration-resistant prostate cancer (mCRPC), and 38 cases (92.7%) had a Gleason score of 8-9. Bone metastasis, the predominant type of distant metastasis, occurred in 36 cases (87.8%). The skeletal and distant lymph node metastases mostly showed a dual positive uptake pattern for both PSMA and FDG (85.7% 24/28 and 81.8% 9/11). 37.5% (3/8) of the metastases to organs showed FDG only positive uptake pattern. The serum levels of prostate specific antigen (PSA) in group A were significantly higher than those in group B (P=0.013). A total of 13 patients of special pathological classification (intraductal carcinoma and neuroendocrine differentiation) were all found to be in group A. Among the 41 cases, 16 were lost to follow-up. Of the 25 patients who completed follow-up, 9 patients, with a median PSA value of 104 ng/mL, experienced PSA progression, while the 16 other patients, with a median PSA of 0.34 ng/mL, did not incur any PSA progression. There was significant difference in the median PSA between patients showing PSA progression and those who did not show PSA progression (P<0.001). Kaplan-Meier survival analysis revealed that the median PSA-PFS of patients of specific pathological classifications was 7 months, which was shorter than the 16 months of the patients with typical prostate cancer, with the difference between the two groups being statistically meaningful (P=0.043). The median PSA-PFS for group A was 30 months. With more than half of the patients in the group not experiencing any PSA progression, group B did not reach the median PSA-PFS (P=0.645).
    Conclusion Dual-tracer PET/CT imaging with 68Ga-PSMA and 18F-FDG commonly exhibits avidity for both tracers in mPCa. Serum PSA level is a reliable biomarker for predicting FDG-positive lesions. mPCa presented with intraductal carcinoma and neuroendocrine differentiation tends to exhibit FDG avidity and is more susceptible to PSA progression.

     

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