Gastric & gastro-oesophageal junction cancer
A cancer with three new targets in five years: Claudin 18.2, FGFR2b, and HER2 with new ADCs, plus immunotherapy in first line.
Gastric and gastro-oesophageal junction adenocarcinoma causes about one million new cases and 660,000 deaths a year, concentrated in East Asia, Eastern Europe, and Latin America, where Helicobacter pylori infection, salt, and smoking drive incidence. Japan and Korea screen endoscopically and cure most cases early; elsewhere two-thirds present with advanced disease and five-year survival is under 30%. Biology splits by the Lauren classification (intestinal vs diffuse) and the TCGA classes (EBV-positive, MSI, genomically stable, chromosomally unstable), and clinically by three actionable biomarkers: HER2 (~15-20%), PD-L1 (CPS ≥5 in ~60%), and Claudin 18.2 (~38% at the approval threshold), with FGFR2b, MSI, and EBV as further strata.
Localised disease is treated with gastrectomy and D2 lymphadenectomy plus perioperative chemotherapy: FLOT in the West, adjuvant S-1 or CAPOX in Asia. MATTERHORN (2025) added durvalumab to FLOT, the first perioperative immunotherapy with an overall survival benefit (3-year OS 68.6%). Advanced disease is stratified at diagnosis: HER2-positive tumours get trastuzumab + chemotherapy + pembrolizumab (KEYNOTE-811) or, after HERIZON-GEA-01, zanidatamab + chemotherapy ± tislelizumab; HER2-negative, PD-L1 CPS ≥5 tumours get nivolumab or pembrolizumab with chemotherapy (CheckMate 649 5-year OS 16% vs 6%); CLDN18.2-positive tumours get zolbetuximab + chemotherapy (SPOTLIGHT/GLOW). Second line: T-DXd for HER2-positive disease (DESTINY-Gastric04, OS 14.7 vs 11.4 months), ramucirumab + paclitaxel otherwise, and from 2026 the CLDN18.2 ADC sonesitatug vedotin (CLARITY-Gastric 01). Third line: trifluridine/tipiracil.
The frontier is Claudin 18.2 (ADCs, CAR-T satri-cel approved in China, bispecifics), biomarker overlap and combination quadruplets, peritoneal-directed therapy for the commonest site of relapse, FGFR2b after the mixed FORTITUDE-101 result, and ctDNA-guided perioperative strategies. Diffuse-type and genomically stable tumours remain the least treatable subgroup.
State of the art today
- Biomarker-stratified first line with four possible add-ons.
- First solid-tumour CAR-T approval (China).
- Three first-line biomarkers (HER2, PD-L1, CLDN18.2) each with a phase 3-proven add-on to chemotherapy; testing all three at diagnosis is standard.
- Zanidatamab beat trastuzumab head-to-head first line (HERIZON-GEA-01, 2026), the first HER2 advance in first line since ToGA.
- T-DXd has phase 3 proof in second-line HER2-positive disease (DESTINY-Gastric04).
- Claudin 18.2 is the first target with an antibody, an ADC with OS benefit (CLARITY-Gastric 01, 2026), and an approved CAR-T (satri-cel, China).
Show survival figures (2)
Averages across everyone diagnosed, often years ago. Your stage, subtype, age, fitness and the treatment you receive matter more than the average, and the numbers are improving quickly.
- Perioperative durvalumab + FLOT (MATTERHORN) is the first immunotherapy to improve survival in resectable gastric cancer (FDA November 2025).
- Five-year survivors exist with chemo-immunotherapy in PD-L1-rich disease (16% vs 6%, CheckMate 649).
Show survival figures (1)
Averages across everyone diagnosed, often years ago. Your stage, subtype, age, fitness and the treatment you receive matter more than the average, and the numbers are improving quickly.
- ~1 million cases and ~660,000 deaths per year; fifth most common cancer and fifth leading cause of cancer death; 5-year survival >60% in Korea and Japan (screening) vs <30% in most of the West.
Where the cases are
Site: Stomach. World: 968,784 new cases, 660,175 deaths.
| # | Country | New cases | Deaths | Incidence ASR |
|---|---|---|---|---|
| 1 | China | 358,672 | 260,372 | |
| 2 | Japan | 126,724 | 43,807 | |
| 3 | India | 64,611 | 57,727 | |
| 4 | Russian Federation | 38,883 | 27,306 | |
| 5 | Korea, Republic of | 29,267 | 8,517 | |
| 6 | United States of America | 25,554 | 10,976 | |
| 7 | Brazil | 23,021 | 18,138 | |
| 8 | Iran, Islamic Republic of | 17,191 | 13,845 | |
| 9 | Viet Nam | 16,277 | 13,264 | |
| 10 | Germany | 14,088 | 8,729 |
Perioperative FLOT ± durvalumab; D2 gastrectomy.
Chemotherapy + PD-1 ± trastuzumab ± zolbetuximab by biomarker.
T-DXd (HER2+), zanidatamab, CLDN18.2 CAR-T/ADC in trials.
H. pylori eradication reduces incidence; endoscopic screening programmes in Japan and Korea (biennial from age 40-50) detect most cancers at a curable stage. No population screening in the West. Prophylactic total gastrectomy for germline CDH1 carriers.
Endoscopic submucosal dissection for well-differentiated mucosal tumours ≤2 cm without ulceration (expanded criteria in Japan); otherwise gastrectomy.
Perioperative FLOT + durvalumab (MATTERHORN: OS HR 0.78, pCR 19%) with D2 gastrectomy; FOLFOX/CAPOX perioperatively for patients unfit for docetaxel.
D2 gastrectomy then adjuvant S-1 (ACTS-GC) or CAPOX (CLASSIC) for 6-12 months; neoadjuvant approaches increasingly adopted.
Trastuzumab + fluoropyrimidine/platinum + pembrolizumab (KEYNOTE-811, PD-L1 CPS ≥1); zanidatamab + chemotherapy ± tislelizumab after HERIZON-GEA-01 (PFS 12.4 vs 8.1 months; sBLA 2026).
Nivolumab (CheckMate 649) or pembrolizumab (KEYNOTE-859) or tislelizumab (RATIONALE-305) with FOLFOX or CAPOX; add zolbetuximab if CLDN18.2-positive (sequencing/combination under study).
Zolbetuximab + mFOLFOX6 or CAPOX (SPOTLIGHT/GLOW). PD-L1 CPS ≥5 double-positives: either add-on; combination trials ongoing.
FOLFOX or CAPOX chemotherapy alone; MSI-high tumours get PD-1 blockade regardless of CPS.
Trastuzumab deruxtecan 6.4 mg/kg (DESTINY-Gastric04, OS 14.7 vs 11.4 months) if HER2 persists on re-biopsy or ctDNA.
Ramucirumab + paclitaxel (RAINBOW, OS 9.6 vs 7.4 months); CLDN18.2-positive: sonesitatug vedotin after CLARITY-Gastric 01 (2026) or satri-cel CAR-T (China).
Trifluridine/tipiracil (TAGS, OS 5.7 vs 3.6 months); irinotecan; clinical trials (FGFR2b, CLDN18.2 bispecifics, T-cell engagers).
Systemic therapy; intraperitoneal paclitaxel, HIPEC, and PIPAC in trials; palliative gastrectomy not recommended (REGATTA).
Subtypes & biomarkers
top- Intestinal type (Lauren; H. pylori-associated, HER2-enriched)
- Diffuse / signet-ring type (CDH1, peritoneal spread, poor prognosis)
- TCGA : EBV-positive (~9%, PD-L1 high, IO-responsive)
- TCGA : MSI-high (~20% localised, ~5% advanced)
- TCGA : genomically stable (diffuse, RHOA/CLDN18-ARHGAP fusions)
- TCGA : chromosomal instability (HER2, EGFR, MET amplification)
- HER2-positive (~15-20%)
- CLDN18.2-positive ≥75% (~38%)
- FGFR2b-overexpressing (~30% any; ~16% at ≥10% 2+/3+)
- Hereditary diffuse gastric cancer (germline CDH1)
- GEJ tumours by Siewert type
- HER2
- PD-L1 CPS
- CLDN18.2
- MSI
- FGFR2b
- EBV
- HER2 IHC/ISH (all advanced cases)
- PD-L1 CPS (22C3 or 28-8)
- CLDN18.2 IHC (VENTANA 43-14A; ≥75% 2+/3+)
- MSI/dMMR
- EBV (EBER in situ hybridisation)
- FGFR2b IHC (trials)
- Germline CDH1 in diffuse type or family history
- Staging laparoscopy with peritoneal cytology
- ctDNA (trials)
Target prevalence in this cancer
| Target / alteration | Prevalence | Measure | Source |
|---|---|---|---|
| FAP | >85% | Stromal FAP | Wikipedia |
| CEACAM5 | 50-60% | IHC, any expression | Wikipedia |
| Claudin 18.2 SPOTLIGHT/GLOW screening | 35-40% | IHC 2+/3+ in >=75% of cells (zolbetuximab definition) | Wikipedia |
| WRN helicase (MSI-high cancers) | 20% | MSI-H | |
| HER2 ToGA screening | 15-20% | IHC 3+ or 2+/ISH+ | Wikipedia |
| FGFR2 FORTITUDE-101 selected IHC 2+/3+ | 3-8% | FGFR2b overexpression/amplification | cBioPortal (TCGA) |
| MET | 2-5% | Amplification | cBioPortal (TCGA) |
How common each drug target or alteration is in this cancer. Population-level and approximate; see the target page for detail. Full matrix.
- 1881Billroth performs the first successful gastrectomy for cancer
- 1965Lauren describes intestinal and diffuse types
- 1983Helicobacter pylori identified (Marshall and Warren)
Later classified as a class I carcinogen (1994); eradication shown to reduce gastric cancer incidence.
- 1990Japan and Korea institute endoscopic screening programmes
Shift to early-stage diagnosis and 5-year survival >60%.
- 2006MAGIC: perioperative chemotherapy improves survival (ECF)
- 2010ToGA: trastuzumab in HER2+ gastric cancer
- 2010ToGA: trastuzumab, the first targeted therapy in gastric cancer
- 2014TCGA molecular classification; RAINBOW establishes ramucirumab + paclitaxel
- 2017Nivolumab third line (ATTRACTION-2); pembrolizumab for MSI-high tumours
- 2019FLOT4: docetaxel quadruplet becomes perioperative standard; trifluridine/tipiracil third line (TAGS)
- 2021Nivolumab + chemotherapy first line
- 2021CheckMate 649: nivolumab + chemotherapy first line; KEYNOTE-811 adds pembrolizumab to trastuzumab; T-DXd approved (DESTINY-Gastric01)
- 2023SPOTLIGHT and GLOW: Claudin 18.2 validated; KEYNOTE-859
- 2024Zolbetuximab: first CLDN18.2 drug
- 2024Zolbetuximab approved (Japan March, US October); zanidatamab approved in biliary cancer
- 2025Satri-cel CAR-T approved in China
- 2025MATTERHORN: perioperative durvalumab approved; DESTINY-Gastric04 phase 3; satri-cel CAR-T approved in China; FORTITUDE-101 mixed; CheckMate 649 five-year data
- 2026HERIZON-GEA-01: zanidatamab beats trastuzumab; CLARITY-Gastric 01: first CLDN18.2 ADC with OS benefit
Open problems
- Peritoneal metastasis.
- Heterogeneous CLDN18.2/HER2 expression.
- Screening only in Japan/Korea.
- Peritoneal metastasis is the dominant relapse pattern and is poorly imaged, poorly penetrated by drugs, and excluded from most trials.
- Diffuse-type and genomically stable tumours lack targets and respond poorly to chemotherapy and immunotherapy.
- Biomarker overlap (CLDN18.2 with PD-L1) has no randomised guidance on combination versus sequence.
- HER2 and CLDN18.2 expression are heterogeneous and can be lost at progression; re-biopsy or ctDNA before second-line targeting is not standard.
- No Western screening strategy; most patients present with advanced disease.
- FGFR2b benefit is uncertain after FORTITUDE-101; the control arm lacked immunotherapy.
- Perioperative immunotherapy benefit by PD-L1 or MSI status, and whether chemotherapy can be omitted in MSI-high disease, are unresolved.
Trials
topRecruiting now (live from ClinicalTrials.gov)
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Landmark trials in OnCo
Expert centres
topCentres linked to this cancer in OnCo
- via this cancer
- via this cancer
- via Trastuzumab deruxtecan
- via this cancer
- Johns Hopkins Hospital / Sidney Kimmel Comprehensive Cancer CenterBaltimore, USNewsweek oncology #10NCI comprehensivevia Pembrolizumab, Microsatellite instability (MSI-H) / mismatch repair deficiency (dMMR)
- via this cancer, Trastuzumab deruxtecan
- via FAPI PET
- via Robotic & minimally invasive surgery
- via this cancer
- via HIPEC / PIPAC (intraperitoneal chemotherapy)
- via Disitamab vedotin
- via this cancer
- National Cancer Center Hospital EastKashiwa, Chiba, JPvia this cancer, MRD / molecular residual disease testing, Trastuzumab deruxtecan, Nivolumab
- via this cancer, MRD / molecular residual disease testing, Cytotoxic chemotherapy
- First Affiliated Hospital of Sun Yat-sen UniversityGuangzhou, CNvia this cancer, Robotic & minimally invasive surgery, HIPEC / PIPAC (intraperitoneal chemotherapy)
- Peking University Cancer HospitalBeijing, CNvia this cancer, Satricabtagene autoleucel, Disitamab vedotin
- A.C. Camargo Cancer CenterSão Paulo, BRvia Robotic & minimally invasive surgery, Germline (hereditary) testing
- via Robotic & minimally invasive surgery, HIPEC / PIPAC (intraperitoneal chemotherapy)
- European Society of Surgical OncologyBrussels, BEvia Robotic & minimally invasive surgery, HIPEC / PIPAC (intraperitoneal chemotherapy)
- Fundación Arturo López PérezSantiago, CLvia this cancer, Robotic & minimally invasive surgery
- German Hodgkin Study GroupCologne, DEvia Nivolumab, Cytotoxic chemotherapy
- Hospital Universitario 12 de OctubreMadrid, ESvia MRD / molecular residual disease testing, Durvalumab
- via this cancer, MRD / molecular residual disease testing
- Institut Jules BordetBrussels, BEvia Pembrolizumab, Trastuzumab
- via this cancer, Germline (hereditary) testing
- IRCCS Ospedale San RaffaeleMilan, ITvia Robotic & minimally invasive surgery, Trastuzumab
- Istituto di Candiolo IRCCS – FPOCandiolo, ITvia this cancer, Trastuzumab
- Keio University HospitalTokyo, JPvia this cancer, Robotic & minimally invasive surgery
- Kyoto University HospitalKyoto, JPvia this cancer, Nivolumab
- Kyushu University HospitalFukuoka, JPvia this cancer, Robotic & minimally invasive surgery
- via this cancer, Robotic & minimally invasive surgery
- NSABP FoundationPittsburgh, PA, USvia Trastuzumab, Chemoprevention & risk-reducing surgery
- Osaka International Cancer InstituteOsaka, JPvia this cancer, Robotic & minimally invasive surgery
- Peking Union Medical College HospitalBeijing, CNvia Robotic & minimally invasive surgery, Germline (hereditary) testing
- Shizuoka Cancer CenterNagaizumi, Shizuoka, JPvia this cancer, Germline (hereditary) testing
- Society of Surgical OncologyRosemont, IL, USvia Robotic & minimally invasive surgery, HIPEC / PIPAC (intraperitoneal chemotherapy)
- Tohoku University HospitalSendai, JPvia this cancer, Germline (hereditary) testing
- Zhongshan Hospital, Fudan UniversityShanghai, CNvia this cancer, Robotic & minimally invasive surgery
- via Nivolumab
- Aichi Cancer CenterNagoya, JPvia this cancer
- All India Institute of Medical Sciences, New DelhiNew Delhi, INvia FAPI PET
- Alliance for Clinical Trials in OncologyChicago, IL, USvia Pembrolizumab
- American Society of HematologyWashington, DC, USvia MRD / molecular residual disease testing
- Apollo Hospitals (Apollo Cancer Centres)Chennai, INvia Robotic & minimally invasive surgery
- via Robotic & minimally invasive surgery
- Breast Cancer TrialsNewcastle, NSW, AUvia Trastuzumab
- Breast International Group (BIG)Brussels, BEvia Trastuzumab
- Butaro Cancer Center of ExcellenceButaro, RWvia Cytotoxic chemotherapy
- via MRD / molecular residual disease testing
- via this cancer
- via MRD / molecular residual disease testing
- Cancer Research UK Manchester InstituteManchester, GBvia MRD / molecular residual disease testing
- Central Drugs Standard Control OrganizationNew Delhi, INvia Trastuzumab
- via Robotic & minimally invasive surgery
- Chang Gung Memorial HospitalTaoyuan, TWvia Robotic & minimally invasive surgery
- Children's Cancer and Leukaemia GroupLeicester, GBvia MRD / molecular residual disease testing
- via MRD / molecular residual disease testing
- Children's Hospital of PhiladelphiaPhiladelphia, PA, USvia Germline (hereditary) testing
- Chinese PLA General HospitalBeijing, CNvia Robotic & minimally invasive surgery
- Chinese Society of Clinical OncologyBeijing, CNvia this cancer
- Chris O'Brien LifehouseSydney, AUvia Robotic & minimally invasive surgery
- Cleveland Clinic Abu DhabiAbu Dhabi, AEvia Robotic & minimally invasive surgery
- via Nivolumab
- Edinburgh Cancer Centre / CRUK Scotland CentreEdinburgh, GBvia Germline (hereditary) testing
- European Association of Nuclear MedicineVienna, ATvia FAPI PET
- European Hematology AssociationThe Hague, NLvia MRD / molecular residual disease testing
- FDA Oncology Center of ExcellenceSilver Spring, MD, USvia MRD / molecular residual disease testing
- via Germline (hereditary) testing
- GEICAM Spanish Breast Cancer GroupMadrid, ESvia Cytotoxic chemotherapy
- via Trastuzumab
- German Breast Group (GBG)Neu-Isenburg, DEvia Durvalumab
- German Lymphoma AllianceHomburg, DEvia Cytotoxic chemotherapy
- GIMEMARome, ITvia MRD / molecular residual disease testing
- GOG FoundationPhiladelphia, PA, USvia Pembrolizumab
- via Germline (hereditary) testing
- Groote Schuur Hospital / University of Cape TownCape Town, ZAvia Germline (hereditary) testing
- via Robotic & minimally invasive surgery
- Hadassah Medical CenterJerusalem, ILvia Germline (hereditary) testing
- via Germline (hereditary) testing
- Henan Cancer HospitalZhengzhou, CNvia this cancer
- Hospital de Clínicas de Porto AlegrePorto Alegre, BRvia Germline (hereditary) testing
- via Trastuzumab
- Hospital Universitari i Politècnic La FeValencia, ESvia Germline (hereditary) testing
- HOVONRotterdam, NLvia MRD / molecular residual disease testing
- Hunan Cancer HospitalChangsha, CNvia this cancer
- via Germline (hereditary) testing
- via Germline (hereditary) testing
- Indiana University Melvin and Bren Simon Comprehensive Cancer CenterIndianapolis, IN, USNCI comprehensivevia Cytotoxic chemotherapy
- Instituto Alexander FlemingBuenos Aires, ARvia Trastuzumab
- via this cancer
- Instituto Nacional de Cancerología (Mexico)Mexico City, MXvia this cancer
- via this cancer
- IRCCS Humanitas Research HospitalRozzano (Milan), ITvia Durvalumab
- via Robotic & minimally invasive surgery
- via Nivolumab
- Istituto Oncologico Veneto IRCCSPadua, ITvia Trastuzumab
- via MRD / molecular residual disease testing
- Japan Clinical Oncology Group (JCOG)Tokyo, JPvia this cancer
- via Germline (hereditary) testing
- King Hussein Cancer CenterAmman, JOvia Germline (hereditary) testing
- Korean Cancer Study GroupSeoul, KRvia this cancer
- Korle Bu Teaching HospitalAccra, GHvia Germline (hereditary) testing
- Lagos University Teaching HospitalLagos, NGvia Germline (hereditary) testing
- via Nivolumab
- via Pembrolizumab
- MovemberMelbourne, AUvia Germline (hereditary) testing
- via Chemoprevention & risk-reducing surgery
- National Cancer Center KoreaGoyang, KRvia this cancer
- via Disitamab vedotin
- Nordic Lymphoma GroupStockholm, SEvia Cytotoxic chemotherapy
- via this cancer
- via Trastuzumab deruxtecan
- via FAPI PET
- QIMR Berghofer Medical Research InstituteBrisbane, AUvia Germline (hereditary) testing
- Queen Mary Hospital / University of Hong KongHong Kong, HKvia Robotic & minimally invasive surgery
- Rajiv Gandhi Cancer Institute and Research CentreNew Delhi, INvia Robotic & minimally invasive surgery
- Ramathibodi Hospital, Mahidol UniversityBangkok, THvia Germline (hereditary) testing
- Ruijin Hospital, Shanghai Jiao Tong UniversityShanghai, CNvia this cancer
- via Robotic & minimally invasive surgery
- Seoul St. Mary's HospitalSeoul, KRvia Robotic & minimally invasive surgery
- Shaare Zedek Medical CenterJerusalem, ILvia Germline (hereditary) testing
- Shanghai Chest HospitalShanghai, CNvia Robotic & minimally invasive surgery
- Shanghai Pulmonary HospitalShanghai, CNvia Robotic & minimally invasive surgery
- Siriraj Hospital, Mahidol UniversityBangkok, THvia Robotic & minimally invasive surgery
- via Germline (hereditary) testing
- Society of Gynecologic OncologyChicago, IL, USvia Robotic & minimally invasive surgery
- SOLTI Cancer Research GroupBarcelona, ESvia Trastuzumab
- SWOG Cancer Research NetworkPortland, OR, USvia Nivolumab
- via MRD / molecular residual disease testing
- via MRD / molecular residual disease testing
- Taipei Veterans General HospitalTaipei, TWvia this cancer
- The Hospital for Sick Children (SickKids)Toronto, ON, CAvia Germline (hereditary) testing
- via Robotic & minimally invasive surgery
- via FAPI PET
- via Trastuzumab
- Uganda Cancer InstituteKampala, UGvia Cytotoxic chemotherapy
- UNICANCERParis, FRvia HIPEC / PIPAC (intraperitoneal chemotherapy)
- University Hospital Düsseldorf / CIO DüsseldorfDüsseldorf, DEvia FAPI PET
- via Cytotoxic chemotherapy
- via Chemoprevention & risk-reducing surgery
- via this cancer
- University of Malaya Medical CentreKuala Lumpur, MYvia Germline (hereditary) testing
- via Cytotoxic chemotherapy
- via this cancer
- via Nivolumab
- West Japan Oncology GroupOsaka, JPvia this cancer
Questions to ask
topQuestions to ask your oncologist about Gastric & gastro-oesophageal junction cancer
Newly diagnosed
- What is my exact diagnosis, stage, and grade, and which tests established them?Why: Everything else follows from an accurate stage and subtype.
- Which biomarkers have been tested on my tumour (for example HER2, PD-L1 CPS, CLDN18.2, MSI, FGFR2b), and what were the results?Why: These results decide eligibility for targeted therapy, immunotherapy, and trials.
- Which subtype is my cancer, and does that change the recommended treatment?Why: Recognised subtypes for this cancer include Intestinal type, Diffuse / signet-ring type, TCGA: EBV-positive.
- Is germline (inherited) genetic testing recommended for me or my family?Why: Inherited variants can change treatment and matter for relatives.
Localised
- For my situation (localised), which of the standard options do you recommend and why?Why: Guideline options include: Perioperative FLOT ± durvalumab; D2 gastrectomy.
- Am I a candidate for Durvalumab, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Advanced first line
- For my situation (advanced first line), which of the standard options do you recommend and why?Why: Guideline options include: Chemotherapy + PD-1 ± trastuzumab ± zolbetuximab by biomarker.
- Am I a candidate for Nivolumab, Pembrolizumab, Trastuzumab, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Later lines
- For my situation (later lines), which of the standard options do you recommend and why?Why: Guideline options include: T-DXd (HER2+), zanidatamab, CLDN18.2 CAR-T/ADC in trials.
- Am I a candidate for Trastuzumab deruxtecan, Zanidatamab, Satricabtagene autoleucel or related drugs, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Prevention and screening
- For my situation (prevention and screening), which of the standard options do you recommend and why?Why: Guideline options include: H. pylori eradication reduces incidence; endoscopic screening programmes in Japan and Korea (biennial from age 40-50) detect most cancers at a curable stage. No population screening in the West. Prophylactic total gastrectomy for germline CDH1 carriers.
Early (T1a) disease
- For my situation (early (t1a) disease), which of the standard options do you recommend and why?Why: Guideline options include: Endoscopic submucosal dissection for well-differentiated mucosal tumours ≤2 cm without ulceration (expanded criteria in Japan); otherwise gastrectomy.
Resectable stage II-III (Western)
- For my situation (resectable stage ii-iii (western)), which of the standard options do you recommend and why?Why: Guideline options include: Perioperative FLOT + durvalumab (MATTERHORN: OS HR 0.78, pCR 19%) with D2 gastrectomy; FOLFOX/CAPOX perioperatively for patients unfit for docetaxel.
- Am I a candidate for FLOT (5-FU, leucovorin, oxaliplatin, docetaxel), Durvalumab, CAPOX (capecitabine, oxaliplatin), and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of MATTERHORN apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Resectable stage II-III (Asian practice)
- For my situation (resectable stage ii-iii (asian practice)), which of the standard options do you recommend and why?Why: Guideline options include: D2 gastrectomy then adjuvant S-1 (ACTS-GC) or CAPOX (CLASSIC) for 6-12 months; neoadjuvant approaches increasingly adopted.
- Am I a candidate for CAPOX (capecitabine, oxaliplatin), and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Advanced, HER2-positive, first line
- For my situation (advanced, her2-positive, first line), which of the standard options do you recommend and why?Why: Guideline options include: Trastuzumab + fluoropyrimidine/platinum + pembrolizumab (KEYNOTE-811, PD-L1 CPS ≥1); zanidatamab + chemotherapy ± tislelizumab after HERIZON-GEA-01 (PFS 12.4 vs 8.1 months; sBLA 2026).
- Am I a candidate for Trastuzumab, Zanidatamab, Pembrolizumab or related drugs, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of ToGA and HERIZON-GEA-01 apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Advanced, HER2-negative, PD-L1 CPS ≥5 (or ≥1), first line
- For my situation (advanced, her2-negative, pd-l1 cps ≥5 (or ≥1), first line), which of the standard options do you recommend and why?Why: Guideline options include: Nivolumab (CheckMate 649) or pembrolizumab (KEYNOTE-859) or tislelizumab (RATIONALE-305) with FOLFOX or CAPOX; add zolbetuximab if CLDN18.2-positive (sequencing/combination under study).
- Am I a candidate for Nivolumab, Pembrolizumab, Tislelizumab or related drugs, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of CheckMate 649 and KEYNOTE-859 apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Advanced, CLDN18.2-positive (≥75%), HER2-negative, first line
- For my situation (advanced, cldn18.2-positive (≥75%), her2-negative, first line), which of the standard options do you recommend and why?Why: Guideline options include: Zolbetuximab + mFOLFOX6 or CAPOX (SPOTLIGHT/GLOW). PD-L1 CPS ≥5 double-positives: either add-on; combination trials ongoing.
- Am I a candidate for Zolbetuximab, FOLFOX (5-FU, leucovorin, oxaliplatin), CAPOX (capecitabine, oxaliplatin), and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of SPOTLIGHT & GLOW apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Advanced, HER2-negative, PD-L1 CPS <1 and CLDN18.2-negative
- For my situation (advanced, her2-negative, pd-l1 cps <1 and cldn18.2-negative), which of the standard options do you recommend and why?Why: Guideline options include: FOLFOX or CAPOX chemotherapy alone; MSI-high tumours get PD-1 blockade regardless of CPS.
- Am I a candidate for FOLFOX (5-FU, leucovorin, oxaliplatin), CAPOX (capecitabine, oxaliplatin), and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Second line, HER2-positive
- For my situation (second line, her2-positive), which of the standard options do you recommend and why?Why: Guideline options include: Trastuzumab deruxtecan 6.4 mg/kg (DESTINY-Gastric04, OS 14.7 vs 11.4 months) if HER2 persists on re-biopsy or ctDNA.
- Am I a candidate for Trastuzumab deruxtecan, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of DESTINY-Gastric04 apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Second line, HER2-negative
- For my situation (second line, her2-negative), which of the standard options do you recommend and why?Why: Guideline options include: Ramucirumab + paclitaxel (RAINBOW, OS 9.6 vs 7.4 months); CLDN18.2-positive: sonesitatug vedotin after CLARITY-Gastric 01 (2026) or satri-cel CAR-T (China).
- Am I a candidate for Ramucirumab, Paclitaxel / nab-paclitaxel, Sonesitatug vedotin or related drugs, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of RAINBOW and CLARITY-Gastric 01 apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Third line and beyond
- For my situation (third line and beyond), which of the standard options do you recommend and why?Why: Guideline options include: Trifluridine/tipiracil (TAGS, OS 5.7 vs 3.6 months); irinotecan; clinical trials (FGFR2b, CLDN18.2 bispecifics, T-cell engagers).
- Am I a candidate for Trifluridine/tipiracil, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Peritoneal metastases
- For my situation (peritoneal metastases), which of the standard options do you recommend and why?Why: Guideline options include: Systemic therapy; intraperitoneal paclitaxel, HIPEC, and PIPAC in trials; palliative gastrectomy not recommended (REGATTA).
Any stage
- Are there clinical trials I could join, for example of Sonesitatug vedotin, Satricabtagene autoleucel, Disitamab vedotin, Zanidatamab?Why: Trials are how the next standard of care is set; asking early keeps options open.
- Would a second opinion at a high-volume centre change anything, and can you help arrange it?Why: Rare or high-stakes decisions benefit from a centre that treats many similar patients.
- What supportive care (symptom control, nutrition, exercise, mental health, financial help) is available from the start?Why: Supportive care improves quality of life and helps patients complete treatment.
- I read that “Peritoneal metastasis”. How does that affect my plan?Why: Open problems are where trials and second opinions matter most.
- I read that “Heterogeneous CLDN18.2/HER2 expression”. How does that affect my plan?Why: Open problems are where trials and second opinions matter most.
Print this page for your appointment (your browser's print command). These prompts are for discussion; your clinical team knows your case.
Direct links plus the targets, companies, and technologies of this cancer's products.
technologies
33targets
12drugs
24companies
20institutions
39pathways
7terms
25trials
13pairings
2ideas
34collections
2people
17bottlenecks
10key papers
3Patients with newly diagnosed advanced stomach cancer should now have Claudin 18.2 tested alongside HER2, PD-L1 and mismatch repair, because roughly a third will be eligible for zolbetuximab, which adds about three months of median survival. The main practical problem is nausea and vomiting during infusions, which needs aggressive prophylaxis. How to sequence or combine it with immunotherapy in PD-L1-positive tumours is unresolved.
Patients with newly diagnosed advanced stomach or oesophageal adenocarcinoma whose tumour is HER2-negative and PD-L1 positive (CPS 5 or more, or at least 1 in some regions) should receive chemotherapy with nivolumab (or pembrolizumab, from KEYNOTE-859), which adds about three months of median survival and doubles the chance of being alive at three years. The benefit in PD-L1-negative tumours is doubtful, and these patients may be better served by chemotherapy alone or by trials.
Maintaining a healthy weight is now established cancer prevention for over a dozen cancer types. For clinicians and policymakers, obesity belongs alongside tobacco and alcohol in prevention strategy. Whether intentional weight loss in adulthood reverses risk is still being studied, including in trials of GLP-1 drugs.
Latest papers
topQuery for this cancer: (TITLE:"Gastric & gastro-oesophageal junction cancer" OR ABSTRACT:"Gastric & gastro-oesophageal junction cancer") AND (treatment OR therapy OR trial OR survival OR diagnosis). Results are unfiltered search hits about Gastric & gastro-oesophageal junction cancer, not a curated reading list.
Pages like this
not linked directly; found by shared links- CancerOesophageal cancer
Shares Siewert classification (GEJ tumours), David Cunningham, Haruhiko Fukuda, Henan Cancer Hospital and the tags gi, spike.
- CancerColorectal cancer
Shares Feng Wang, David Cunningham, Tae-You Kim, Structured mentorship so district general surgeons perform common cancer operations safely and the tags gi, spike.
- CancerPancreatic ductal adenocarcinoma
Shares CARsgen Therapeutics, Rapid diagnostic centres for people with vague but worrying symptoms, Automatic palliative care referral triggered by diagnosis, not by decline, Dedicated cohorts for patients with performance status 2 in first-line trials and the tags gi, spike.
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Shares University of Hawai'i Cancer Center, First Affiliated Hospital of Sun Yat-sen University, Taipei Veterans General Hospital, Eliminate infection-caused cancers: HPV, hepatitis B and C, H. pylori and EBV and the tags gi, spike.
- CancerBiliary tract cancer (cholangiocarcinoma)
Shares Fundación Arturo López Pérez, Endoscopy (EGD, EUS, ERCP), Zhongshan Hospital, Fudan University, Sonesitatug vedotin and the tags gi, spike.
- CancerNon-small-cell lung cancer
Shares Haruhiko Fukuda, Henan Cancer Hospital, University of Hawai'i Cancer Center, Automatic palliative care referral triggered by diagnosis, not by decline and the tag spike.
- CancerOvarian cancer
Shares Cancer neuroscience: cutting the nerve supply, HIPEC (hyperthermic intraperitoneal chemotherapy), Intraperitoneal (IP) chemotherapy, Peritoneal metastasis and the tag spike.
- CancerHead and neck squamous cell carcinoma
Shares An Epstein-Barr virus vaccine to prevent nasopharyngeal cancer and lymphomas, Epstein-Barr virus (EBV) in cancer, Eliminate infection-caused cancers: HPV, hepatitis B and C, H. pylori and EBV, Shizuoka Cancer Center and the tag spike.