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Overview and Recommendations
Background
- •Gastric cancer recurrence after curative resection occurs in three patterns, locoregional (anastomotic site, tumor bed, regional nodes), distant metastatic (liver, extra-abdominal sites), or peritoneal, each with distinct management implications. The Dutch D1D2 trial established that D2 lymphadenectomy reduces local recurrence from 22% to 12% and regional recurrence from 19% to 13% compared with D1 dissection, though with higher operative mortality (10% vs 4%); gastric-cancer-related death at 15 years was 48% (D1) vs 37% (D2).
- •The paradigm for managing recurrent disease has shifted from palliative chemotherapy alone to biomarker-driven therapy, with mandatory retesting of HER2, PD-L1 combined positive score (CPS), and microsatellite instability (MSI) at the time of recurrence, as expression can change from the primary tumor. The landmark REGATTA trial demonstrated that gastrectomy does not improve survival in patients with a single non-curable factor (liver, peritoneum, para-aortic nodes), establishing that systemic therapy is the backbone for distant metastatic disease.
- •Peritoneal metastases carry the worst prognosis but have shown sensitivity to regional approaches. The DRAGON-01 trial of intraperitoneal plus intravenous paclitaxel with S-1 improved median overall survival (OS) to 19.4 months vs 13.9 months with intravenous alone (HR 0.67). The GASTRIPEC-I trial of cytoreductive surgery (CRS) with or without hyperthermic intraperitoneal chemotherapy (HIPEC) showed no OS benefit in the full cohort, but progression-free survival (PFS) was significantly longer with HIPEC (7.1 vs 3.5 months), and patients achieving complete cytoreduction had improved OS.
- •Oligometastatic disease, defined as ≤3 metastases confined to a single organ or a single extra-regional lymph node station, with peritoneal cancer index (PCI) ≤6 for peritoneal-limited disease, represents a distinct subset where metastasis-directed local therapy (SBRT, metastasectomy, or conversion surgery) may improve survival. The OMEC consensus stratifies by disease-free interval (DFI): for metachronous OMD with DFI >2 years, upfront local treatment is an option; for synchronous or DFI ≤2 years, systemic therapy is given first, followed by restaging for local therapy.
- •Prognosis remains poor, but sequential systemic therapy offers meaningful benefit. A meta-analysis of salvage chemotherapy demonstrated a 36% reduction in the risk of death (HR 0.64) with second-line therapy vs best supportive care. The GC-RiskAssigner seven-gene signature (CDH1, ELOVL5, EGFR, PIP5K1B, FGF1, CD44v8.10, TBCEL) identifies high-risk patients with median OS 10.2 months vs 80.9 months for low-risk patients in the MAGIC trial (HR 5.1). Circulating tumor DNA (ctDNA) is a powerful adjunct for early detection, with 80.65% of recurrences detectable within 90 days before radiographic progression.
Evaluation
- •Suspect recurrent gastric cancer when any of the following symptoms develop in a patient with prior curative-intent therapy: dysphagia to solid food or liquids, vomiting, abdominal pain, chest pain, regurgitation, unexpected weight loss, or progressive hoarseness. Asymptomatic patients with pStage II/III disease should undergo risk-adapted surveillance, with the NCCN guideline preferred for pStage III (ICER $983/QALY).
- •Order contrast-enhanced CT (CECT) of the chest, abdomen, and pelvis as the initial imaging modality. The CT-derived extracellular volume fraction (CT-ECV) ≥56.9% predicts postoperative recurrence in pStage II-III disease (sensitivity 82.1%, specificity 61.9%). CT-based radiomic models (e.g., Radiomics-Clinical Integrated Risk Stratification, RSA) predict early recurrence (within 2 years) with AUC 0.870-0.873 in external validation.
- •If CECT is negative or equivocal, obtain 68Ga-FAPI PET/CT, which detects recurrence in additional patients (17.9% management change) and has pooled sensitivity 74% and specificity 89% for regional lymph node metastases. FAPI PET/CT parameters (total lesion FAP expression ≥188.88 SUVbw·cm³, FAPI-avid tumor volume ≥44.17 cm³) independently predict worse PFS and OS, respectively.
- •Perform re-biopsy of an accessible lesion to reassess HER2, PD-L1 CPS, and MSI status, as these can change between primary and recurrent disease. For patients with peritoneal metastases, diagnostic laparoscopy with PCI calculation is essential to confirm the extent of peritoneal disease and guide therapy (e.g., intraperitoneal chemotherapy vs systemic alone).
- •Assess ECOG performance status, disease-free interval (DFI) from initial therapy, number and sites of metastases, and serum albumin. For oligometastatic evaluation, confirm the definition: ≤3 metastases in a single organ or one extra-regional lymph node station; for peritoneal-limited, PCI ≤6. The OMEC consensus recommends systemic therapy first for synchronous OMD or metachronous OMD with DFI ≤2 years, then restaging; upfront local therapy is an option for metachronous OMD with DFI >2 years.
- •Obtain circulating tumor DNA (ctDNA) if available; ctDNA positivity within 90 days before radiographic recurrence has 80.65% sensitivity. Combining ctDNA with tumor markers (CEA, CA19-9, CA72-4, CA125, CA242) increases the overall positive rate to 94.9% and improves agreement with pathological response to 83.8%. Consider molecular profiling with GC-RiskAssigner signature, ATM expression, and CLDN18.2 expression for prognostic stratification and potential targeted therapy.
- •Rule out pseudoprogression or immune-related adverse events if the patient is on immunotherapy. For patients with peritoneal carcinomatosis, assess for symptomatic ascites, bowel obstruction, and nutritional status. A PCI >6 generally excludes patients from regional therapy trials and suggests polymetastatic disease.
Management
- •Initiate first-line systemic therapy for HER2-negative, PD-L1 CPS ≥5 disease with a platinum-fluoropyrimidine doublet plus an immune checkpoint inhibitor. Recommended regimen: oxaliplatin 130 mg/m² IV on day 1 plus capecitabine 1000 mg/m² orally twice daily on days 1-14 of a 21-day cycle, combined with nivolumab 360 mg IV every 3 weeks or pembrolizumab 200 mg IV every 3 weeks. Continue until progression or unacceptable toxicity.
- •For HER2-positive disease (IHC 3+ or 2+ with FISH amplification), add trastuzumab to the chemotherapy backbone: trastuzumab 8 mg/kg IV loading dose, then 6 mg/kg IV every 3 weeks. For patients with MSI-high or dMMR, consider pembrolizumab monotherapy as first-line (if PD-L1 CPS ≥1) or second-line after progression on chemotherapy.
- •For peritoneal metastases without obstruction, use intraperitoneal plus intravenous paclitaxel with S-1: paclitaxel 50 mg/m² IV plus 20 mg/m² IP on days 1 and 8, combined with S-1 80 mg/m² orally daily on days 1-14 of a 21-day cycle (DRAGON-01 regimen). This improved median OS to 19.4 months vs 13.9 months with IV alone (HR 0.67). For patients achieving complete cytoreduction at CRS, consider HIPEC with mitomycin C or cisplatin (doses per institutional protocol).
- •After progression on first-line platinum-based therapy, use second-line therapy. For patients with platinum-free interval <6 months, start paclitaxel 80 mg/m² IV weekly (days 1, 8, 15 of a 28-day cycle) plus ramucirumab 8 mg/kg IV every 2 weeks (RAINBOW regimen). Alternatively, irinotecan 150 mg/m² IV every 2 weeks is an option (WJOG 4007: median OS 9.5 vs 8.4 months, not significant). For those with longer platinum-free interval, platinum re-challenge may be considered.
- •In the third-line refractory setting, start regorafenib 160 mg orally once daily on days 1-21 of a 28-day cycle (INTEGRATE: PFS 2.6 vs 0.9 months, HR 0.40). Alternatively, apatinib 850 mg orally once daily continuously (median OS 4.83 vs 2.5 months). For patients with low ATM expression, olaparib plus paclitaxel (olaparib 300 mg BID continuously, paclitaxel 80 mg/m² weekly) achieved median OS 13.1 months vs 8.3 months (HR 0.56).
- •For oligometastatic disease (≤3 metastases in one organ, PCI≤6), consider metastasis-directed therapy after systemic therapy. For liver/lung oligometastases, stereotactic body radiotherapy (SBRT) 45-51 Gy in 3 fractions (e.g., 48 Gy in 3 fractions) is an option. For isolated para-aortic lymph node recurrence, SBRT 45-51 Gy in 3 fractions produced complete response in 5/7 patients with 3-year OS 43%. For solitary liver metastasis, metastasectomy yields median OS 34 months. For peritoneal oligometastasis (PCI≤6), cytoreductive surgery (CRS) with HIPEC can achieve 5-year survival 30-50% in expert centers.
- •Avoid gastrectomy for palliation in patients with distant metastases (REGATTA: no benefit, HR 1.09). For locoregional recurrence not amenable to local therapy, second-line chemotherapy prolongs survival (HR 0.64). Salvage surgery for recurrence after non-curative ESD carries limited benefit (median survival 5 months).
- •Monitor for adverse effects: with trastuzumab deruxtecan (T-DXd) for HER2-positive disease, any-grade ILD occurs in 9.6% (grade ≥3 in 2.8%, grade 5 in 1.2%), with median onset 2.9 months, require vigilant monitoring. With regorafenib, monitor for hypertension, hand-foot skin reaction, and diarrhea. With intraperitoneal chemotherapy, monitor for catheter-related infections and bowel obstruction.
- •Integrate palliative care early for symptom management (pain, nausea, obstruction, ascites). Refer to clinical trials for novel agents (e.g., CLDN18.2-targeted therapy, ADCs, bispecific antibodies). Discharge criteria for supportive care: when ECOG PS ≥3, progressive disease despite third-line therapy, or patient declines further treatment.
Board Review — High Yield
- •REGATTA trial, Gastrectomy does NOT improve survival in patients with a single non-curable factor (liver, peritoneum, para-aortic nodes); HR 1.09.
- •DRAGON-01 trial, Intraperitoneal paclitaxel + S-1 improves OS in peritoneal metastases (19.4 vs 13.9 months, HR 0.67).
- •GASTRIPEC-I trial, CRS±HIPEC: no OS benefit overall, but PFS longer with HIPEC and benefit in complete cytoreduction subgroup.
- •68Ga-FAPI PET/CT, Superior to CT for detecting recurrence; detection rate 95% for primary, 97% for distant mets.
- •Oligometastatic definition, ≤3 metastases in one organ, PCI≤6; metachronous with DFI>2 years may benefit from upfront local therapy.
- •Re-biopsy at recurrence, Mandatory, as HER2, PD-L1, MSI status can change from primary tumor.
- •ctDNA surveillance, 80.65% of recurrences detectable within 90 days before radiographic progression.
- •GC-RiskAssigner, Seven-gene signature (CDH1, ELOVL5, etc.) stratifies risk: high-risk median OS 10.2 months, low-risk 80.9 months (HR 5.1).
- •Avoid gastrectomy, REGATTA: no survival benefit; gastrectomy for palliation not indicated.
- •T-DXd ILD, Any-grade ILD in 9.6%; median onset 2.9 months; monitor closely.
Deep Dive — Evidence Details
Patterns of Recurrence
- ▸D2 lymphadenectomy reduces local and regional recurrence compared to D1.
- ▸Gastrectomy does not improve survival in metastatic disease (REGATTA).
Recurrence after curative therapy follows locoregional, distant metastatic, or peritoneal patterns. The Dutch D1D2 trial showed D2 lymphadenectomy reduces local recurrence from 22% to 12% and regional recurrence from 19% to 13% vs. D1, with spleen-preserving technique in high-volume centers [17]A1b. Locoregional recurrence is defined at anastomotic site, duodenal stump, tumor bed, or regional nodes. The ARTIST2 trial showed that in node-positive, D2-resected patients, adjuvant SOX (S-1 plus oxaliplatin) improves 3-year DFS to 74.3% vs. 64.8% with S-1 alone (P=0.042), while adding radiotherapy to SOX provides no additional benefit [2]A1b. Distant metastases include liver, extra-abdominal sites, and lymph nodes outside the radiation field. The REGATTA trial found that gastrectomy plus chemotherapy does not improve survival over chemotherapy alone in patients with a single non-curable factor (HR 1.09, 95% CI 0.78-1.52) [18]A1b. Peritoneal metastases are the most common distant pattern. The GASTRIPEC-I trial showed that CRS plus HIPEC did not improve OS (14.9 months in both arms) but prolonged PFS (7.1 vs. 3.5 months) [7]A1b. The PHOENIX-GC trial of intraperitoneal plus intravenous paclitaxel with S-1 showed a trend toward OS benefit (HR 0.72, 95% CI 0.49-1.04) [8]A1b. Pearl: The pattern of recurrence, locoregional, distant, or peritoneal, is not random; it is strongly influenced by the quality of initial surgery (D1 vs D2), nodal status, and tumor biology. Identifying the pattern with cross-sectional imaging and, when indicated, diagnostic laparoscopy is the essential first step before selecting any salvage therapy, because the management of locoregional failure (where surgery or radiotherapy may be considered) differs fundamentally from that of disseminated disease (where systemic therapy remains the backbone).
| Recurrence Type | D1 (n=380) | D2 (n=331) | Difference |
|---|---|---|---|
| Local recurrence | 22% (82) | 12% (40) | 10% absolute reduction |
| Regional recurrence | 19% (73) | 13% (43) | 6% absolute reduction |
| Gastric-cancer-related death | 48% (182) | 37% (123) | 11% absolute reduction |
Data from Songun I, et al. Lancet Oncol 2010 [17]A1b.
Workup of Suspected Recurrence
- ▸68Ga-FAPI PET/CT has high sensitivity for recurrent disease.
- ▸Re-biopsy is essential to reassess HER2, PD-L1, MSI.
Workup includes clinical assessment, biomarker surveillance, imaging, and biopsy. Eight symptoms should trigger investigation: dysphagia, vomiting, abdominal pain, chest pain, regurgitation, weight loss, hoarseness [25]A1b. For pStage II/III, risk-based surveillance is cost-effective (NCCN guideline for pStage III, ICER $983/QALY) [24]A1b. Contrast-enhanced CT (CECT) is standard. CT-derived biomarkers like extracellular volume fraction ≥56.9% predicts recurrence (sensitivity 82.1%, specificity 61.9%) [37]B3b. Radiomic models predict early recurrence with AUC 0.870-0.873 [27]B2b. 68Ga-FAPI PET/CT offers superior detection: pooled detection 95% for primary, 97% for distant metastases, sensitivity 74%, specificity 89% for regional nodes [26]B2a. It led to management change in 17.9% of patients [40]C4. ctDNA is positive in 80.65% within 90 days before radiographic recurrence [33]C4. Combining ctDNA with tumor markers increases positive rate to 94.9% [39]B3b. Tissue biopsy is recommended to reassess HER2, PD-L1 CPS, and MSI. Trastuzumab deruxtecan (T-DXd) is an option for HER2-positive recurrence; real-world data shows any-grade ILD in 9.6% (grade ≥3 in 2.8%, grade 5 in 1.2%), median onset 2.9 months [21]B3b. Pearl: When investigating suspected recurrence, a normal CT does not rule out disease; consider 68Ga-FAPI PET/CT for its superior sensitivity, and always obtain tissue for re-biopsy to guide biomarker-driven therapy, as HER2 and PD-L1 status can change between primary and recurrent disease.
| Modality | AUC / Detection Rate | Key Threshold | Clinical Utility |
|---|---|---|---|
| CT radiomics (RSA model) [27]B2b | AUC 0.870-0.873 (external) | Risk score dichotomized | Predicts early recurrence within 2 years |
| Multimodal RSA (CT + pathology) [28]B2b | AUC 0.903 (training), 0.884-0.889 (external) | Score ≥0.19 identifies chemotherapy benefit | Adds significant net reclassification improvement |
| 68Ga-FAPI PET/CT [40]C4 | Changed management in 17.9% | N/A | Detects additional recurrences, influences treatment |
| FAPI PET/CT (meta-analysis) [26]B2a | Sensitivity 74%, Specificity 89% (LN) | N/A | Superior to FDG for LN and distant metastases |
| [18F]FAPI-04 PET/CT [32]C4 | TLF AUC 0.80 for durable clinical benefit | TLF ≥188.88, FTV ≥44.17 cm³ | Independent predictor of PFS and OS |
| Deep learning (peritoneal recurrence) [29]B2b | AUC 0.843-0.857 | N/A | Predicts peritoneal recurrence; guides HIPEC decisions |
| Symptom | Consensus Agreement |
|---|---|
| Dysphagia to solid food | ≥75% |
| Dysphagia to liquids | ≥75% |
| Vomiting | ≥75% |
| Abdominal pain | ≥75% |
| Chest pain | ≥75% |
| Regurgitation of foods | ≥75% |
| Unexpected weight loss | ≥75% |
| Progressive hoarseness of voice | ≥75% |
Local-Regional Recurrence
- ▸Isolated locoregional recurrence is rare; most patients also have distant disease.
- ▸SBRT is an option for isolated para-aortic node recurrence.
Isolated locoregional recurrence is uncommon (4% of recurrences) [41]C4. Options include salvage surgery, endoscopic management, SBRT, and systemic therapy. After non-curative ESD, salvage surgery yields limited survival (median 5-7 months) [42]C4. For residual positive lateral margins after ESD, hybrid EMR-hot avulsion (EMR-HA) has recurrence rate 11.5% vs. 44% for hot avulsion and 36.6% for argon plasma coagulation [44]C4. SBRT (45-51 Gy in 3 fractions) for isolated para-aortic lymph node recurrence produced complete response in 5/7 patients, 3-year OS 43% [50]C4. For unresectable locoregional recurrence, second-line chemotherapy prolongs survival vs. BSC (HR 0.64, 95% CI 0.52-0.79) [1]B2a. Third-line docetaxel (75 mg/m² q3w) yields median OS 4.7 months, with grade 3-4 neutropenia in 58% [46]B2b. Prognostic factors for benefit from third-line therapy include ECOG 0-1, albumin ≥4 mg/dL, and PFS ≥2.7 months after second-line [49]D5. Pearl: For isolated locoregional recurrence, SBRT or salvage surgery can be considered, but outcomes are modest; the majority of patients eventually develop distant disease, so systemic therapy remains a cornerstone of management.
Distant Metastatic Disease
- ▸First-line therapy includes immunotherapy-chemotherapy for HER2-negative disease.
- ▸Intraperitoneal paclitaxel is effective for peritoneal metastases.
Treatment depends on biomarker status (HER2, MSI, PD-L1 CPS) and prior platinum exposure. First-line for HER2-negative disease: platinum-fluoropyrimidine doublet (e.g., oxaliplatin 130 mg/m² IV q3w + capecitabine 1000 mg/m² PO BID days 1-14) plus immune checkpoint inhibitor (nivolumab or pembrolizumab). A network meta-analysis showed immunotherapy-chemotherapy improves OS (HR 0.79, 95% CI 0.74-0.84) and PFS (HR 0.72, 0.68-0.77) [57]A1a. For HER2-positive, add trastuzumab. Second-line: weekly paclitaxel (80 mg/m² on days 1,8,15 q4w) or biweekly irinotecan (150 mg/m² on days 1,15 q4w) - WJOG4007 showed no significant difference (OS 9.5 vs 8.4 months, HR 1.13) [11]A1b. Paclitaxel plus ramucirumab is standard. Third-line: regorafenib (160 mg PO daily days 1-21 q28d) improved PFS vs. placebo (2.6 vs. 0.9 months, HR 0.40) [51]B2b. For peritoneal metastases, intraperitoneal plus IV paclitaxel with S-1 (DRAGON-01) improved OS (19.4 vs. 13.9 months, HR 0.67) [52]A1b. CRS ± HIPEC: GASTRIPEC-I showed no OS benefit but longer PFS with HIPEC [7]A1b. PIPAC is palliative for refractory cases. Gastrectomy in metastatic disease does not improve survival (REGATTA) [18]A1b. Pearl: For patients with distant metastatic gastric cancer, first-line therapy is guided by biomarker retesting (HER2, PD-L1, MSI); isolated peritoneal metastases are an indication for intraperitoneal paclitaxel (HR 0.67 for OS [52]A1b), while gastrectomy does not improve survival and should be avoided outside of clinical trials [18]A1b.
Oligometastatic Disease
- ▸OMD defined as ≤3 metastases in one organ or one extra-regional node station.
- ▸Local therapy plus systemic therapy improves OS over systemic alone.
Oligometastatic disease (OMD) is defined as ≤3 metastases in a single organ or one extra-regional lymph node station (OMEC consensus) [66]A1c[68]B2a. Peritoneal oligometastasis is considered with PCI ≤6 [81]D5. For metachronous OMD with DFI >2 years, upfront local treatment is an option; for synchronous or DFI ≤2 years, start with systemic therapy then restage. A Dutch cohort showed local treatment (SBRT or metastasectomy) plus systemic therapy improved OS (22.7 months) vs. systemic alone (8.5 months, HR 0.42) [65]A1b. SBRT for liver metastases: proton beam therapy reported 3-year OS 45.3%, local recurrence 6% [78]C4. Metastasectomy for solitary liver metastasis yields median OS 34 months [73]C4. Conversion surgery after induction chemotherapy (e.g., DOS regimen) improves survival (Neo-REGATTA) [75]C4. After resection of synchronous oligometastases, postoperative chemotherapy (S-1 or S-1 plus cisplatin) improved OS to 35.2 vs. 11.1 months (HR 3.56) [74]C4. For peritoneal oligometastasis (PCI ≤6), CRS + HIPEC can achieve 5-year survival 30-50% [81]D5. Pearl: The selection of oligometastatic patients for local therapy requires a strict definition (≤3 metastases in one organ), a disease-free interval >2 years for metachronous disease, and multidisciplinary evaluation to confirm disease stability after systemic therapy, only then does metastasis-directed treatment offer a survival advantage over systemic therapy alone.
| Modality | Typical Indication | Key Outcomes | Reference |
|---|---|---|---|
| Proton beam therapy | Liver oligometastases (≤3 lesions) | 3-yr OS 45.3%; no Grade ≥3 AEs | [78]C4 |
| Metastasectomy | Solitary liver metastasis, resectable lymph node | Median OS 21-34 mo; 5-yr OS 30% | [73]C4 |
| CRS + HIPEC | Peritoneal oligometastasis (PCI ≤6) | 5-yr OS 30-50% | [81]D5 |
Prognosis of Recurrent Disease
- ▸Second-line chemotherapy improves survival (HR 0.64).
- ▸GC-RiskAssigner signature stratifies prognosis (HR 5.1 for high vs. low risk).
Prognosis is poor; median survival measured in months. Second-line chemotherapy reduces risk of death by 36% (HR 0.64, 95% CI 0.52-0.79) vs. BSC [1]B2a. In second-line, oral vs. IV paclitaxel (DREAM trial) showed OS 9.7 vs. 8.9 months [85]A1b. Third-line: avelumab vs. physician's choice (JAVELIN Gastric 300) OS 4.6 vs. 5.0 months [4]A1b; everolimus vs. placebo (GRANITE-1) OS 5.4 vs. 4.3 months [89]B2b; apatinib improved OS from 2.5 to 4.83 months [91]B2b. Olaparib plus paclitaxel in selected population achieved OS 13.1 vs. 8.3 months (HR 0.56) [90]B2b. Prognostic factors: ECOG 0-1, DFI >12 months, single metastatic site, favorable gene signatures. The GC-RiskAssigner seven-gene signature identifies high-risk (median OS 10.2 months) vs. low-risk (80.9 months, HR 5.1) [3]A1b. First-degree family history of gastric cancer is associated with better OS (HR 0.47) [16]B3b. Low ATM protein expression predicts benefit from olaparib/paclitaxel (HR 0.35) [90]B2b. CLDN18.2 expression ≥70% has ORR 14% [92]B2b. A nomogram for early gastric cancer recurrence achieved concordance index 0.82 [87]C4. Pearl: The most powerful modifiable determinant of prognosis in recurrent disease is the delivery of second-line chemotherapy, which reduces the risk of death by 36% (HR 0.64, 95% CI 0.52-0.79) compared with best supportive care; however, long-term survival remains rare and is best predicted by performance status, disease-free interval, and molecular markers such as the GC-RiskAssigner signature and ATM status.
Related Pages
- ▸Refer to parent and child pages for comprehensive management.
Part of the Gastric Cancer family. Cross-cutting management is split across dedicated child pages: , Gastric Cancer Surgical Management , Gastric Cancer Radiation Management , , Gastric Cancer Palliative Care , Gastric Cancer Surveillance and Follow-up . Pearl: Use these links to hop between management modalities; the parent Gastric Cancer page carries diagnosis + staging that informs every decision here.
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