OpenOnco · Breast · TNBC/HER2-low met 2L · T-DXd (DESTINY-Breast04 subset)
← Back to galleryFeedback on this case
Synthetic educational example. Do not self-treat: a qualified treating physician must verify the sources, patient data, contraindications, and final plan.
OpenOnco · Treatment Plan
Treatment plan — Invasive breast cancer
PLAN-BREAST-TNBC-2L-HER2LOW-001-V1 · v1 · 2026-08-17
Patient
BREAST-TNBC-2L-HER2LOW-001 · Algorithm: ALGO-BREAST-TNBC-2L
DiagnosisInvasive breast cancer
MOH / ICD-10C50
ICD-O-38500/3; C50.9
StageIV
Histologyinvasive_ductal_carcinoma_NST

Clinical significance of mutations (ESCAT)

Tumor-board context — the engine does not use these tiers to rank tracks
✅ Covered biomarkers (matched in KB)
BiomarkerVariantESCATEvidenceClinical significanceDrugsSources
ESCAT: clinical review pendingBIO-HER2-LOWIHC 1+ OR IHC 2+/ISH-negative (HER2-low by ASCO/CAP 2023 criteria)IA
Standard care
  • SRC-DESTINY-BREAST04-MODI-2022: Level A (Supports, Sensitivity/Response)
  • SRC-NCCN-BREAST-2025: Level Category 1 (Supports, Sensitivity/Response)
  • SRC-ESMO-BREAST-METASTATIC-2024: Level A (Supports, Sensitivity/Response)
Trastuzumab deruxtecan (T-DXd, DS-8201) is FDA-approved (Aug 2022) for unresectable or metastatic HER2-low (IHC 1+ or 2+/ISH-) breast cancer following prior chemotherapy. DESTINY-Breast04 (Modi et al. NEJM 2022): HR+/HER2-low — mPFS 10.1 vs 5.4 mo (HR 0.49, p<0.001); mOS 23.9 vs 17.5 mo (HR 0.64, p=0.003). HR-/HER2-low (TNBC subgroup) — mOS 18.2 vs 8.3 mo. DESTINY-Breast06 (Curigliano et al. NEJM 2024) extended indication to HER2-low and HER2-ultralow (IHC 0 with incomplete staining) HR+/HER2- endocrine-pretreated patients — mPFS 13.2 vs 8.1 mo (HR 0.62, p<0.001). T-DXd dose: 5.4 mg/kg IV q3w. Key safety: interstitial lung disease (ILD) / pneumonitis ~12% (grade ≥3 ~3%) — mandatory baseline CT and monitoring per NCCN/ESMO. HER2-low reclassification affects ~60% of previously HER2-negative metastatic breast cancer patients — large population impact.trastuzumab deruxtecan (T-DXd) 5.4 mg/kg IV q3w monotherapy (post-chemotherapy; DESTINY-Breast04)
trastuzumab deruxtecan (T-DXd) 5.4 mg/kg IV q3w monotherapy (post-endocrine HR+ disease; DESTINY-Breast06)
  • SRC-NCCN-BREAST-2025
  • SRC-ESMO-BREAST-METASTATIC-2024
  • SRC-DESTINY-BREAST04-MODI-2022
⚠️ Not included in plan
BiomarkerStatus
BIO-ERExcluded (negative)
BIO-PRExcluded (negative)

Primary current-line option

Standard plan
★ DEFAULT
Indication
IND-BREAST-TNBC-2L-T-DXD-HER2-LOW
Regimen
T-DXd monotherapy (HER2+ metastatic 2L+, also HER2-low metastatic)
Drugs + NSZU
  • Trastuzumab deruxtecan (T-DXd) (DRUG-TRASTUZUMAB-DERUXTECAN) 5.4 mg/kg IV · Day 1 of 21-day cycle, continuous until progression · IV ✓ NSZU covered
Supportive care
SUP-BONE-HEALTH-PROSTATE
Reason
Primary current-line option selected by ALGO-BREAST-TNBC-2L at step 3.

Other current-line alternatives (3 tracks)

Same treatment line; review when biomarker, access, contraindication, or patient-context assumptions change.
Standard plan
Indication
IND-BREAST-TNBC-2L-BRCA-OLAPARIB
Regimen
Olaparib monotherapy (BRCA-mutant HER2- breast: metastatic OR adjuvant high-risk early)
Drugs + NSZU
  • Olaparib (DRUG-OLAPARIB) 300 mg PO BID continuous · Until progression (metastatic) or 1 year (OlympiA adjuvant) · PO ⚠ NSZU — not for this indication
Supportive care
SUP-BONE-HEALTH-PROSTATE
Reason
Current-line alternative presented for HCP consideration
Standard plan
Indication
IND-BREAST-TNBC-2L-BRCA-TALAZOPARIB
Regimen
Olaparib monotherapy (BRCA-mutant HER2- breast: metastatic OR adjuvant high-risk early)
Drugs + NSZU
  • Olaparib (DRUG-OLAPARIB) 300 mg PO BID continuous · Until progression (metastatic) or 1 year (OlympiA adjuvant) · PO ⚠ NSZU — not for this indication
Supportive care
SUP-BONE-HEALTH-PROSTATE
Reason
Current-line alternative presented for HCP consideration
Standard plan
Indication
IND-BREAST-TNBC-2L-SACITUZUMAB
Regimen
Sacituzumab govitecan monotherapy (TNBC ≥2L; HR+/HER2- ≥3L)
Drugs + NSZU
  • Sacituzumab govitecan (DRUG-SACITUZUMAB-GOVITECAN) 10 mg/kg IV · Days 1, 8 of 21-day cycle, until progression · IV ✗ Not registered in UA
Supportive care
SUP-G-CSF-PRIMARY-PROPHYLAXIS-PROSTATE, SUP-BONE-HEALTH-PROSTATE
Reason
Current-line alternative presented for HCP consideration

Why this branch was chosen

Triggers from the patient profile that fired and drove the chosen branch.
Step 2 → branch 3
  • RF-BREAST-HER2-LOW-ACTIONABLE ★ winner: HER2-low breast cancer (IHC 1+ OR IHC 2+ with non-amplified ISH) — ~50-55% of HER2-non-positive breast cancers. T-DXd 2L+ approved in HR+ and TNBC HER2-low post-chemo (DESTINY-Breast04 — mPFS 9.9 vs 5.1 mo, OS 23.4 vs 16.8 mo). SRC-NCCN-BREAST-2025SRC-ESMO-BREAST-METASTATIC-2024SRC-DESTINY-BREAST04-MODI-2022

Pre-treatment investigations

Investigations before treatment start · critical / standard / desired · merged across tracks
IDNamePriorityCategoryWhere to orderNeeded for
TEST-CECT-CAPCECT chest/abdomen/pelvisCriticalimagingall tracks
TEST-ER-PR-IHCER + PR immunohistochemistry on tumorCriticalCSD Lab ✓ (code TBC)all tracks
TEST-HER2-IHC-FISHHER2 IHC + reflex FISH on tumorCriticalCSD Lab ✓ (code TBC)all tracks
TEST-GERMLINE-BRCA-PANELGermline BRCA1/2 + HRR panel sequencingStandardCSD Lab: M089all tracks

Red flags — PRO / CONTRA aggressive

PRO-AGGRESSIVE

Triggers that push toward the aggressive track
  • HER2-ultralow breast cancer (IHC > 0 < 1+; faint/incomplete membrane staining ≤10% of tumor cells) — a sub-tier between IHC 0 and IHC 1+ not part of standard ASCO/CAP scoring. DESTINY-Breast06 (Bardia 2024 ASCO plenary) extended T-DXd benefit beyond HER2-low to HER2-ultralow HR+ metastatic breast post-endocrine + CDK4/6i, chemo-naive in the metastatic setting (HER2-low cohort mPFS 13.2 vs 8.1 mo, HR 0.62; HER2-ultralow exploratory n=153 mPFS 13.2 vs 8.3 mo, HR 0.78). FDA label expansion anticipated 2026 — candidate RF until pivotal-trial Source SRC-DESTINY-BREAST06-BARDIA-2024 ingested.
    Candidate RF — DESTINY-Breast06 trial-Source not yet ingested (SRC-DESTINY-BREAST06-BARDIA-2024 flagged in BIO-HER2-ULTRALOW notes). Pathology re-scoring required: ASCO/CAP 2018 / 2023 guideline does not formally distinguish ultralow from…
    RF-BREAST-HER2-ULTRALOW-CANDIDATESRC-NCCN-BREAST-2025SRC-ESMO-BREAST-METASTATIC-2024
  • HBV/HCV/HIV serology + dental evaluation pre-bisphosphonate/denosumab + DPYD genotyping for capecitabine-containing regimens (EU practice).
    Cross-disease HBV reactivation handled by RF-UNIVERSAL-HBV-REACTIVATION- RISK. DPYD deficiency screening unique to fluoropyrimidine-containing regimens; severe / fatal toxicity in homozygous deficient patients — EU/EMA-recommended pre-test.
    RF-BREAST-INFECTION-SCREENINGSRC-NCCN-BREAST-2025SRC-ESMO-BREAST-EARLY-2024

CONTRA-AGGRESSIVE

Hard contraindications to escalation

Timeline

Treatment timeline — derived from regimen + monitoring schedule

Standard plan

Induction · T-DXd monotherapy (HER2+ metastatic 2L+, also HER2-low metastatic)
21-day cycles × Continuous until progression or unacceptable toxicity

Standard plan

Induction · Olaparib monotherapy (BRCA-mutant HER2- breast: metastatic OR adjuvant high-risk early)
28-day cycles × Adjuvant: 12; Metastatic: continuous until progression

Standard plan

Induction · Sacituzumab govitecan monotherapy (TNBC ≥2L; HR+/HER2- ≥3L)
21-day cycles × Continuous until progression

MDT brief

Discussion questions (1, 0 blocking)

MDT talk tree (1 steps)

#OwnerTopicAction
1molecular_geneticistBiomarker status What is the status of BRCA1/BRCA2 germline pathogenic variant (BIO-BRCA1-BRCA2-GERMLINE)? It is required by track(s): IND-BREAST-TNBC-2L-BRCA-OLAPARIB, IND-BREAST-TNBC-2L-BRCA-TALAZOPARIB. Expected value: pathogenic OR likely-pathogenic germline variant.

Skills (recommended) — for consideration (1)

  • Molecular geneticist / molecular oncologist recommended
    Indication references an actionable genomic biomarker — mutation / target / actionability interpretation needed.
    Owns: OQ-BIOMARKER-BRCA1-BRCA2-GERMLINE

Data quality

Usable with caveats. No critical default-track gap was found, but the MDT should review the listed caveats before final sign-off.
  • Biomarker coverage: 1/2 known (50%), 1 missing, 0 default-track gaps
  • Unevaluated RedFlags: RF-ACTIVE-AUTOIMMUNE-DISEASE-ICI-RISK, RF-ATM-CONFIRMED-CARRIER, RF-ATM-FAMILY-HISTORY-SUSPICION, RF-BARD1-CONFIRMED-CARRIER, RF-BARD1-FAMILY-HISTORY-SUSPICION, RF-BLM-CONFIRMED-CARRIER, RF-BRCA-CONFIRMED-CARRIER, RF-BRCA-HBOC-FAMILY-HISTORY-SUSPICION, RF-BREAST-AKT1-E17K-ACTIONABLE, RF-BREAST-AKT1-E17K-CAPIVASERTIB-CANDIDATE, RF-BREAST-BRCA-GERMLINE-ACTIONABLE, RF-BREAST-CDH1-LOBULAR-CANDIDATE, RF-BREAST-EARLY-STAGE, RF-BREAST-ESR1-MUT-ACTIONABLE, RF-BREAST-ESR1-Y537S-D538G-CANDIDATE, RF-BREAST-FRAILTY-AGE, RF-BREAST-HER2-AMP-ACTIONABLE, RF-BREAST-HER2-LOW-ACTIONABLE, RF-BREAST-HER2-ULTRALOW-CANDIDATE, RF-BREAST-HIGH-RISK-BIOLOGY, RF-BREAST-INFECTION-SCREENING, RF-BREAST-ORGAN-DYSFUNCTION, RF-BREAST-OVARIAN-HRD-ASSAY-DISTINCTION, RF-BREAST-PIK3CA-COALT-INAVOLISIB-CANDIDATE, RF-BREAST-PIK3CA-MUT-ACTIONABLE, RF-BREAST-STAGE-IV-METASTATIC, RF-BREAST-TNBC, RF-BREAST-TRANSFORMATION-PROGRESSION, RF-CASCADE-BRCA-FDR-POSITIVE, RF-CASCADE-LFS-FDR-POSITIVE, RF-CHEK2-CONFIRMED-CARRIER, RF-CHEK2-FAMILY-HISTORY-SUSPICION, RF-CHRONIC-SEVERE-OBESITY-BMI40-PREVENTION, RF-CHRONIC-T2DM-CANCER-RISK-PREVENTION, RF-COWDEN-CONFIRMED-CARRIER, RF-COWDEN-FAMILY-HISTORY-SUSPICION, RF-HDGC-CDH1-CONFIRMED-CARRIER, RF-IATROGENIC-COMBINED-HRT-PREVENTION, RF-IATROGENIC-IODINE131-SECONDARY-PREVENTION, RF-IATROGENIC-LONG-TERM-HRMNL-CONTRACEPTION-PREVENTION, RF-IATROGENIC-PRIOR-RADIATION-PREVENTION, RF-LI-FRAUMENI-CONFIRMED-CARRIER, RF-LI-FRAUMENI-FAMILY-HISTORY-SUSPICION, RF-LIFESTYLE-ALCOHOL-CANCER-PREVENTION, RF-LIFESTYLE-OBESITY-CANCER-PREVENTION, RF-LIFESTYLE-SEDENTARY-PREVENTION, RF-LIFESTYLE-SUGARY-BEVERAGES-PREVENTION, RF-NBN-CONFIRMED-CARRIER, RF-NF1-CONFIRMED-CARRIER, RF-NF1-FAMILY-HISTORY-SUSPICION, RF-OCC-IONIZING-RADIATION-PREVENTION, RF-OCC-SHIFTWORK-CIRCADIAN-PREVENTION, RF-PALB2-CONFIRMED-CARRIER, RF-PALB2-FAMILY-HISTORY-SUSPICION, RF-PAN-ATM-CHEK2-CDK12-PARPI-CANDIDATE, RF-PAN-BRCA-SOMATIC-PARPI-CANDIDATE, RF-PAN-PALB2-PARPI-CANDIDATE, RF-PEUTZ-JEGHERS-CONFIRMED-CARRIER, RF-PEUTZ-JEGHERS-FAMILY-HISTORY-SUSPICION, RF-RAD51C-D-CONFIRMED-CARRIER, RF-RAD51C-D-FAMILY-HISTORY-SUSPICION, RF-REPRODUCTIVE-BREAST-ENDOMETRIAL-PREVENTION, RF-REPRODUCTIVE-DES-IN-UTERO-EXPOSURE-PREVENTION, RF-REPRODUCTIVE-LATE-FIRST-PREGNANCY-PREVENTION, RF-REPRODUCTIVE-OCP-LONG-TERM
Missing biomarkerLabelMDT ownerDefault trackRequired byNext action
BIO-BRCA1-BRCA2-GERMLINEBRCA1/BRCA2 germline pathogenic variantmolecular_geneticistnoIND-BREAST-TNBC-2L-BRCA-OLAPARIB, IND-BREAST-TNBC-2L-BRCA-TALAZOPARIBVerify result, method, specimen, and report date before sign-off. Expected/constraint: pathogenic OR likely-pathogenic germline variant
Technical MDT skill metadata (1/16 activated in this plan)
All registered virtual specialists. ✓ — activated for this case; ○ — not activated (available for other clinical scenarios).
Specialistskill_idVersionLast reviewedSign-offsDomain
Cellular therapy specialist (CAR-T)cellular_therapy_specialistv0.1.02026-04-250cellular_therapy
Clinical pharmacistclinical_pharmacistv0.1.02026-04-250clinical_pharmacy
Hematologist / oncohematologisthematologistv0.1.02026-04-250hematology_oncology
Hematopathologist (lymphoma / leukemia / myeloma)hematopathologistv0.1.02026-04-250hematopathology
Infectious disease / hepatologyinfectious_disease_hepatologyv0.1.02026-04-250infectious_diseases
Medical oncologist (solid-tumor chemotherapist)medical_oncologistv0.1.02026-04-250solid_oncology
Molecular geneticist / molecular oncologistmolecular_geneticistv0.1.02026-04-250molecular_oncology
Palliative carepalliative_carev0.1.02026-04-250palliative_care
Pathologist (general)pathologistv0.1.02026-04-250pathology
Primary care / family physicianprimary_carev0.1.02026-04-250primary_care
Psycho-oncologistpsychologistv0.1.02026-04-250psychosocial
Radiation oncologistradiation_oncologistv0.1.02026-04-250radiation_oncology
Radiologistradiologistv0.1.02026-04-250diagnostic_imaging
Social worker / case managersocial_worker_case_managerv0.1.02026-04-250psychosocial
Surgical oncologistsurgical_oncologistv0.1.02026-04-250surgical_oncology
Transplant specialist (BMT)transplant_specialistv0.1.02026-04-250cellular_therapy

Sources cited

Experimental options (clinical trials)

Third plan track — open-enrollment trials from ClinicalTrials.gov. Render-time metadata; engine selection is not affected by this block (CHARTER §8.3). Last synced: 2026-08-17.
NCTTitlePhaseStatusSponsorUASignalsEligibility (excerpt)
NCT07102381A Phase 2 Neoadjuvant Study of Zanidatamab in Combination With Chemotherapy in Participants With HER2-positive Breast CancerPHASE2RECRUITINGJazz Pharmaceuticals
NCT06995118The Application of "HUAXI Hole 1" in Reverse-sequence Endoscopic Nipple-sparing Mastectomy With Direct-to-implant Breast ReconstructionNARECRUITINGDu ZhengguiSingle country
NCT05196087Non-Invasive Artificial Intelligence-Based Platform MonIToring Program (NIP IT!)N/ARECRUITINGUniversity Health Network, TorontoSingle country
NCT06268665Tart Cherry Juice as a Dietary Supplement for the Prevention of Paclitaxel-Induced NeuropathyPHASE2RECRUITINGUniversity of California, DavisSingle country
NCT05919108Neoadjuvant Neratinib in Stage I-III HER2-Mutated Lobular Breast CancersPHASE2RECRUITINGVanderbilt-Ingram Cancer CenterSmall N (<50) Single country
NCT07483307A Study of the Impact of Endocrine Therapy on Surgical Outcomes in People With Lobular Breast CancerPHASE2RECRUITINGMemorial Sloan Kettering Cancer CenterSingle country
NCT00477100Biospecimen and Medical Data Collection and Tumor Biopsy in Creating Research Tissue Registry in Patients With Inflammatory or Invasive Breast CancerN/ARECRUITINGM.D. Anderson Cancer CenterSingle country
NCT05059444ORACLE: Observation of ResiduAl Cancer With Liquid Biopsy EvaluationN/ARECRUITINGGuardant Health, Inc.
NCT06518837Tirzepatide for Weight Loss Intervention in Early-Stage Hormone Receptor Positive/HER2 Negative Breast CancerPHASE2RECRUITINGRutgers, The State University of New JerseySmall N (<50) Single country
NCT07067437Single-Fraction Very Accelerated Partial Breast Irradiation (sfVAPBI)NARECRUITINGNational Institute of Oncology, Hungary

Verify recruitment status directly with the trial site. ctgov data can lag behind current UA-site status.

Option availability in Ukraine

Per-track UA registration · NSZU · cost · access pathway. Render-time metadata; engine selection does not depend on these fields (CHARTER §8.3).
OptionUA registrationNSZUCost orientationAccess pathway
Standard plan
T-DXd monotherapy (HER2+ metastatic 2L+, also HER2-low metastatic) (REG-TDXD-METASTATIC)
✓ registered✓ covered₴-? — verify pathwayNSZU formulary
Standard plan
Olaparib monotherapy (BRCA-mutant HER2- breast: metastatic OR adjuvant high-risk early) (REG-OLAPARIB-BREAST)
✓ registered✓ covered₴-? — verify pathwayNSZU formulary
Standard plan
Olaparib monotherapy (BRCA-mutant HER2- breast: metastatic OR adjuvant high-risk early) (REG-OLAPARIB-BREAST)
✓ registered✓ covered₴-? — verify pathwayNSZU formulary
Standard plan
Sacituzumab govitecan monotherapy (TNBC ≥2L; HR+/HER2- ≥3L) (REG-SACITUZUMAB)
1/1 component drug(s) not registered in Ukraine +1
✗ not registered✗ out-of-pocket₴-? — verify pathwaynot recorded
Trial · NCT07102381
A Phase 2 Neoadjuvant Study of Zanidatamab in Combination With Chemotherapy in Participants With HER2-positive Breast Cancer
No UA site listed — international referral required
— unknown— unknown
self-pay: ₴0/course
Trial sponsor
Trial · NCT06995118
The Application of "HUAXI Hole 1" in Reverse-sequence Endoscopic Nipple-sparing Mastectomy With Direct-to-implant Breast Reconstruction
No UA site listed — international referral required
— unknown— unknown
self-pay: ₴0/course
Trial sponsor
Trial · NCT05196087
Non-Invasive Artificial Intelligence-Based Platform MonIToring Program (NIP IT!)
No UA site listed — international referral required
— unknown— unknown
self-pay: ₴0/course
Trial sponsor
Trial · NCT06268665
Tart Cherry Juice as a Dietary Supplement for the Prevention of Paclitaxel-Induced Neuropathy
No UA site listed — international referral required
— unknown— unknown
self-pay: ₴0/course
Trial sponsor
Trial · NCT05919108
Neoadjuvant Neratinib in Stage I-III HER2-Mutated Lobular Breast Cancers
No UA site listed — international referral required
— unknown— unknown
self-pay: ₴0/course
Trial sponsor
Trial · NCT07483307
A Study of the Impact of Endocrine Therapy on Surgical Outcomes in People With Lobular Breast Cancer
No UA site listed — international referral required
— unknown— unknown
self-pay: ₴0/course
Trial sponsor
Trial · NCT00477100
Biospecimen and Medical Data Collection and Tumor Biopsy in Creating Research Tissue Registry in Patients With Inflammatory or Invasive Breast Cancer
No UA site listed — international referral required
— unknown— unknown
self-pay: ₴0/course
Trial sponsor
Trial · NCT05059444
ORACLE: Observation of ResiduAl Cancer With Liquid Biopsy Evaluation
No UA site listed — international referral required
— unknown— unknown
self-pay: ₴0/course
Trial sponsor
Trial · NCT06518837
Tirzepatide for Weight Loss Intervention in Early-Stage Hormone Receptor Positive/HER2 Negative Breast Cancer
No UA site listed — international referral required
— unknown— unknown
self-pay: ₴0/course
Trial sponsor
Trial · NCT07067437
Single-Fraction Very Accelerated Partial Breast Irradiation (sfVAPBI)
No UA site listed — international referral required
— unknown— unknown
self-pay: ₴0/course
Trial sponsor

Cost information is orientation. Verify with a specific pharmacy / foundation / trial site. Status updated: 2026-08-17.