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4 treatment settings, 1 with more than one named option. Each section lays out the options the standard of care names, what each is for, the trials behind them with their recorded results, the side effects and cautions on record, and questions to ask. Built from the cancer page's standard-of-care rows; nothing here is advice for your case.
Trastuzumab deruxtecan ahead of chemotherapy for HER2-low or ultralow disease (DESTINY-Breast06).
Trastuzumab deruxtecan (Enhertu) is the most successful ADC ever. It redefined HER2 by working in tumours with only tiny amounts of the protein, and in 2026 moved into early-stage breast cancer.
PFS HR 0.62.
| Side effect | Any grade | Grade 3+ |
|---|---|---|
| Neutropenia · DESTINY-Breast03/04; all-grade rates ≥20% per label | - | 18% |
| Nausea · DESTINY-Breast03/04; all-grade rates ≥20% per label | - | 7% |
| Anaemia · DESTINY-Breast03/04; all-grade rates ≥20% per label | - | 7% |
| Fatigue · DESTINY-Breast03/04; all-grade rates ≥20% per label | - | 6% |
Rates from the label or pivotal trial as recorded on the product page; each grade 3+ figure links to its source.
Add these to your appointment list, or take the full question set for this cancer.
Trastuzumab deruxtecan for HER2-low disease of either hormone receptor status (DESTINY-Breast04).
Trastuzumab deruxtecan (Enhertu) is the most successful ADC ever. It redefined HER2 by working in tumours with only tiny amounts of the protein, and in 2026 moved into early-stage breast cancer.
OS HR 0.64.
| Side effect | Any grade | Grade 3+ |
|---|---|---|
| Neutropenia · DESTINY-Breast03/04; all-grade rates ≥20% per label | - | 18% |
| Nausea · DESTINY-Breast03/04; all-grade rates ≥20% per label | - | 7% |
| Anaemia · DESTINY-Breast03/04; all-grade rates ≥20% per label | - | 7% |
| Fatigue · DESTINY-Breast03/04; all-grade rates ≥20% per label | - | 6% |
Rates from the label or pivotal trial as recorded on the product page; each grade 3+ figure links to its source.
Add these to your appointment list, or take the full question set for this cancer.
TROP2 antibody-drug conjugates first (ASCENT, TROPION-Breast02), trastuzumab deruxtecan as a later option.
The first TROP2-targeted ADC. It delivers a strong chemotherapy directly to breast and bladder cancer cells and is now a first-line option in triple-negative breast cancer.
Datopotamab deruxtecan (Datroway) is the second TROP2 ADC and shares Enhertu's payload. In 2026 it became a first-line option for triple-negative breast cancer patients who cannot receive immunotherapy.
Trastuzumab deruxtecan (Enhertu) is the most successful ADC ever. It redefined HER2 by working in tumours with only tiny amounts of the protein, and in 2026 moved into early-stage breast cancer.
OS 12.1 vs 6.7 months, HR 0.48.
OS 23.7 vs 18.7 months; PFS also improved.
| Side effect | Any grade | Grade 3+ |
|---|---|---|
| Neutropenia (grade 3 or higher) · ASCENT, sacituzumab arm; 33 percent with chemotherapy | - | 51% |
| Neutropenia · ASCENT, Trodelvy arm, n=258 | 78% | 49% |
| Diarrhoea · ASCENT, Trodelvy arm, n=258 | 59% | 11% |
| Diarrhoea (grade 3 or higher) · ASCENT; below 1 percent with chemotherapy | - | 10% |
Rates from the label or pivotal trial as recorded on the product page; each grade 3+ figure links to its source.
| Side effect | Any grade | Grade 3+ |
|---|---|---|
| Stomatitis · TROPION-Breast01, n=360 | 59% | 7% |
| Fatigue · TROPION-Breast01, n=360 | 44% | 4.2% |
| Nausea · TROPION-Breast01, n=360 | 56% | 1.4% |
| Keratitis · TROPION-Breast01, n=360 | 24% | 1.1% |
Rates from the label or pivotal trial as recorded on the product page; each grade 3+ figure links to its source.
| Side effect | Any grade | Grade 3+ |
|---|---|---|
| Neutropenia · DESTINY-Breast03/04; all-grade rates ≥20% per label | - | 18% |
| Nausea · DESTINY-Breast03/04; all-grade rates ≥20% per label | - | 7% |
| Anaemia · DESTINY-Breast03/04; all-grade rates ≥20% per label | - | 7% |
| Fatigue · DESTINY-Breast03/04; all-grade rates ≥20% per label | - | 6% |
Rates from the label or pivotal trial as recorded on the product page; each grade 3+ figure links to its source.
Add these to your appointment list, or take the full question set for this cancer.
Baseline and interval CT, prompt corticosteroids and permanent discontinuation for grade 2 or higher interstitial lung disease.
A CT scan is a fast 3D X-ray that shows the size and shape of tumours and whether they have spread.
No trial record is attached to this row yet. The trials tab lists what is recruiting and the landmark trials for this cancer.
Add these to your appointment list, or take the full question set for this cancer.