The "King" of Lymphoma Treatment Efficacy Evaluation — PET/CT
Clinical physicians place high importance on accurately assessing treatment efficacy in the early stages. If the therapy proves ineffective, treatment regimens must be promptly adjusted to minimize adverse reactions and reduce medical costs. However, identifying whether lymphoma has improved in its early stages is far from straightforward. This is because metabolic and functional changes occur before any observable alterations in tumor size or morphology during lymphoma treatment.
This phenomenon is akin to being handed two eggs of identical size—one raw and one boiled—and being asked to determine their state solely by visual inspection. The critical distinction lies in the biological activity: the raw egg remains metabolically active, while the boiled egg is biologically inert.
Equipped with exceptional sensitivity, ¹⁸F-FDG PET/CT detects glucose metabolic activity within tissues, effortlessly distinguishing the metabolically inactive "boiled egg." Thus, even when lymphoma shows no anatomical changes after a short-term treatment, PET/CT—acting like a pair of "all-seeing eyes"—can identify residual viable lymphoma tissue. This enables comprehensive evaluation of the tumor's early response to therapy, achieving the goals of predicting and assessing treatment efficacy.
case 1
Patient Profile: A 53-year-old female diagnosed with diffuse large B-cell lymphoma (DLBCL) of the abdomen, who completed 6 cycles of chemotherapy.
PET/CT imaging revealed complete disappearance of hypermetabolic lymphoma lesions, with a Deauville score of 1, indicating a complete metabolic response (CMR).
case 2
Patient Profile: A 52-year-old female diagnosed with diffuse large B-cell lymphoma (DLBCL) via core needle biopsy, undergoing evaluation after 6 cycles of chemotherapy.
Expert Consensus of the 2021 CSCO Lymphoma ¹⁸F-FDG PET/CT Imaging Guidelines
(1) Baseline Evaluation
Recommended Timing: Prior to the initiation of treatment.
(2) Interim Evaluation
Recommended Timing:
- Hodgkin Lymphoma (HL): After 2 cycles of chemotherapy
- Non-Hodgkin Lymphoma (NHL): After 4 cycles of chemotherapy
Optimal PET/CT Examination Window: 1–2 days before the next scheduled chemotherapy cycle.
(3) Post-Treatment Evaluation
Recommended Timing:
- Chemotherapy: 6–8 weeks after treatment completion
- Radiotherapy: 8–12 weeks after treatment completion
Rationale: To minimize confounding inflammatory responses induced by therapy.
The PET/CT Center of Gansu Wuwei Academy of Medical Sciences Tumor Hospital has introduced the GE Discovery 710 Super Iterative PET/CT system—the most advanced 256-ring LBS crystal PET/128-slice spiral CT in China. As the fourth PET/CT unit in Gansu Province and the only one installed in a prefecture-level hospital statewide, this cutting-edge device represents GE Healthcare's flagship super-iterative technology, setting a new benchmark in global medical imaging. Compared to conventional PET/CT systems, it offers significantly enhanced sensitivity and specificity.
Featuring an unprecedented 1.8mm spatial resolution, the system dramatically improves detection capabilities for microlesions while substantially reducing whole-body scan duration and radiation exposure for patients—all without compromising diagnostic accuracy. Recognized as the pinnacle of modern medical imaging technology, this platform has redefined diagnostic excellence.
The Center houses a state-of-the-art radiopharmaceutical laboratory equipped with a medical cyclotron system capable of producing diverse disease-specific tracers, including ¹¹C, ¹³N, and ¹⁸F. The synthesized radiotracers achieve purity levels exceeding national standards and attaining world-class quality, ensuring optimal diagnostic precision for patients. With the capability to perform both ¹¹C and ¹⁸F imaging studies, our PET/CT Center stands as the only facility in Gansu Province offering dual-tracer molecular imaging services.
Consultation Hotline: Director Li Ke (13689357660)
Medical Service Address: PET/CT Center, Heavy Ion Therapy Campus, Gansu Wuwei Academy of Medical Sciences