Quantitative <sup>68</sup>Ga-DOTATATE PET/CT Parameters for the Prediction of Therapy Response in Patients with Progressive Metastatic Neuroendocrine Tumors Treated with <sup>177</sup>Lu-DOTATATE
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Bibliographic record
Abstract
The aim of this study was to determine whether quantitative PET parameters on baseline <sup>68</sup>Ga-DOTATATE PET/CT and interim PET (iPET) performed before the second cycle of therapy are predictive of the therapy response and progression-free survival (PFS). <b>Methods:</b> Ninety-one patients with well-differentiated neuroendocrine tumors (mean Ki-67 index, 8.3%) underwent <sup>68</sup>Ga-DOTATATE PET/CT to determine suitability for peptide receptor radionuclide therapy as part of a prospective multicenter study. The mean follow-up was 12.2 mo. Of the 91 patients, 36 had iPET. The tumor metrics evaluated were marker lesion–based measures (mean SUV<sub>max</sub> and ratio of the mean lesion SUV<sub>max</sub> to the SUV<sub>max</sub> in the liver or the SUV<sub>max</sub> in the spleen), segmented <sup>68</sup>Ga-DOTATATE tumor volumes (DTTVs), SUV<sub>max</sub> and SUV<sub>mean</sub> obtained with the liver and spleen as thresholds, and heterogeneity parameters (coefficient of variation, kurtosis, and skewness). The Wilcoxon rank sum test was used for the association between continuous variables and the therapy response, as determined by the clinical response. Univariable and multivariable Cox proportional hazards models were used for the association with PFS. <b>Results:</b> There were 71 responders and 20 nonresponders. When marker lesions were used, higher mean SUV<sub>max</sub> and ratio of the mean lesion SUV<sub>max</sub> to the SUV<sub>max</sub> in the liver were predictors of the therapy response (<i>P</i> = 0.018 and 0.024, respectively). For DTTV parameters, higher SUV<sub>max</sub> and SUV<sub>mean</sub> obtained with the liver as a threshold and lower kurtosis were predictors of a favorable response (<i>P</i> = 0.025, 0.0055, and 0.031, respectively). The latter also correlated with a longer PFS. The iPET DTTV SUV<sub>mean</sub> obtained with the liver as a threshold and the ratio of mean SUV<sub>max</sub> obtained from target lesions at iPET to baseline PET correlated with the therapy response (<i>P</i> = 0.024 and 0.048, respectively) but not PFS. From the multivariable analysis with adjustment for age, primary site, and Ki-67 index, the mean SUV<sub>max</sub> (<i>P</i> = 0.019), ratio of the mean lesion SUV<sub>max</sub> to the SUV<sub>max</sub> in the liver (<i>P</i> = 0.018), ratio of the mean lesion SUV<sub>max</sub> to the SUV<sub>max</sub> in the spleen (<i>P</i> = 0.041), DTTV SUV<sub>mean</sub> obtained with the liver (<i>P</i> = 0.0052), and skewness (<i>P</i> = 0.048) remained significant predictors of PFS. <b>Conclusion:</b> The degree of somatostatin receptor expression and tumor heterogeneity, as represented by several metrics in our analysis, were predictive of the therapy response or PFS. Changes in these parameters after the first cycle of peptide receptor radionuclide therapy did not correlate with clinical outcomes.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it