• Trastuzumab duocarmazine (T-Duo) significantly improved progression-free survival in patients with advanced HER2-positive metastatic breast cancer compared to physician's choice of treatment.
• The TULIP trial reported a median progression-free survival of 7 months in the T-Duo group versus 5 months in the physician's choice group (HR = 0.64, P = .002).
• While overall survival showed a positive trend with T-Duo (20 vs. 16 months), the difference was not statistically significant (P = .153).
• Ocular toxicity, including keratitis and conjunctivitis, was a notable side effect, leading to treatment discontinuation in a significant portion of patients.