Enhertu (trastuzumab deruxtecan) [product monograph]. HC.

Approved indications from this document for cancer drugs containing at least one biomarker.

Indication	Statements
ENHERTU (trastuzumab deruxtecan for injection) as monotherapy is indicated for the treatment of adult patients with unresectable or metastatic human epidermal growth factor receptor 2 (HER2)-positive breast cancer who have received at least one prior anti-HER2-based regimen either in the metastatic setting, or in the neoadjuvant or adjuvant setting and developed disease recurrence during or within 6 months of completing neoadjuvant or adjuvant therapy.	2
ENHERTU (trastuzumab deruxtecan for injection) as monotherapy is indicated for the treatment of adult patients with unresectable or metastatic HER2-positive breast cancer who have received prior treatment with trastuzumab emtansine (T-DM1).	1
ENHERTU (trastuzumab deruxtecan) as monotherapy is indicated for the treatment of adult patients with unresectable or metastatic HER2-low (IHC 1+ or IHC 2+/ISH-) breast cancer who have received at least one prior line of chemotherapy in the metastatic setting or developed disease recurrence during or within 6 months of completing adjuvant chemotherapy.
ENHERTU (trastuzumab deruxtecan) as monotherapy is indicated for the treatment of adult patients with unresectable, locally advanced or metastatic HER2-positive gastric or gastroesophageal junction (GEJ) adenocarcinoma who have received a prior trastuzumab-based regimen.	1

Precision oncology relationships for therapeutic response derived from this document.

Type	Biomarker(s)	Cancer type	Therapy(ies)
Sensitivity (+)	HER2-positive	Invasive Breast Carcinoma	Trastuzumab deruxtecan
Sensitivity (+)	HER2-low	Invasive Breast Carcinoma	Trastuzumab deruxtecan
Sensitivity (+)	HER2-positive	Invasive Breast Carcinoma	Trastuzumab deruxtecan
Sensitivity (+)	HER2-positive	Adenocarcinoma of the Gastroesophageal Junction	Trastuzumab deruxtecan