@Non-enhancing regionにおけるrCBVで再発GBMのunmethylationの予測が可能(American Journal of Neuroradiology 2021;42(5):853-86.)
- initial and recurrent (MGMT methylated, n = 13)
- initial and recurrent (MGMT unmethylated, n = 18)
- initial MGMT methylated and recurrent MGMT unmethylated, n = 9)
- におけるEnhancing region, Non-enhancing region (NER)でのnormalized ADC and normalized rCBVの3群比較
- MRI:first preoperative & second preoperative MRIをreview
- Normalized ADC and rCBV:pixel-based mapをunaffected contralateral deep white matterのevery rCBV/ADC valueで割ったもの。
- Enhancing region: ROIは全スライスのtumor enhancing portionに置き、macrovessels, cystic, hemorrhagic, necrotic portionsは避けてある。
- NER: T2WI hyperintensity non-enhancing region。
- Histogram analysisにてmean, 90th percentile, 95th percentile (nrCBV), mean, 5th percentile, 10th percentile (nADC)を計算。
- さらにnrCBVrecurrent/initial and nADCrecurrent/initialも計算。
[Results]
- IDH1 or 2 mutations, EGFR amplification; radiation dose, KPSに三群で有意差なし。
- Enhancing regionにおけるnADC, nrCBVに三群で有意差なし。
- NERでは、MU群ではmean, 90th, 95th percentiles of rCBVがMM群やUU群よりも有意に高い。
- initial tumorのNERにおけるCBVがmethylation status changeのbest predictorであり、cutoff value 2.594でMU vs. MMの感度77.78%, 特異度92.31%
[その他]
- MGMT gene promoter methylationのあるGBMはTMZ chemotherapy後の予後が良いことが知られている。
- MGMT geneはDNA repair proteinをencodeする。
- MGMT geneのepigenetic silencing by methylation of its promoterはTMZのcytotoxic effectと相関する。
- CCRT後のpseudoprogressionはMGMT methylated GBMによりcommon。
- reduced MGMT promoter methylation in recurrent GBM after TMZ treatment:therapeutic resistance獲得の一員と考えられている。
- In a recent study, the rCBV of the NER was a significant prognostic biomarker, independent of morphologic features in GBM. In addition, the volume transfer constant in the NER could be a potential prognostic imaging biomarker in GBM.
- An enhancing lesion with a low volume transfer constant and ve (volume of extravascular extracellular space) was more likely to progress because of its low permeability or leakiness of the BBB, in which the delivery of TMZ to viable tumor cells might be less effective during standard treatment.
@neoadjuvant FOLFIRINOX後の膵癌再発におけるCT・病理組織学的所見(European Radiology 2021;31:3616–26.)
- Extrapancreatic perineural invasion (EPNI) on baseline CT (HR 2.53)は早期再発の重要な予測因子
- Tumor regression grade (TRG)も早期再発 (HR 1.76),予後不良(HR1.05)の重要な予測因子
- EPNI positivityはR1 or R2 groupでR0 groupよりも多い傾向にあったが有意差はない。
- IVC invasionはR1 or R2 groupでR0 groupよりも有意に多いが早期再発の予測因子ではない。
- T stagingはEPNIと有意に相関する。
- EPNIは5 routes, 3-point scaleで評価
- 3-point scale: 1, normal; 2, streaky and strand-like structure in fat tissue and a fine reticular pattern; 3, irregular masses adjacent to the lesions. grade 2 and 3でEPNIと診断。
- 5 routes: Mochizuki et al. 2010 必読。
- plexus pancreaticus capitalis 1 and 2;
- anterior pathway along the GDA plexus and CHA plexus;
- from the left celiac ganglia to the body and tail via the plexus around the splenic artery;
- from the left celiac ganglia and the celiac plexus to the posterior region of the pancreas body
