There is no information available in the provided sources regarding whether lurbinectedin can pass through breast milk. The sources provide information about the drug, its patent status, and its FDA label, but do not mention anything about the drug's potential to pass through breast milk. It is important to consult with a healthcare provider before taking any medication while breastfeeding to ensure the safety of both the mother and the baby.

Sources:
[1] Drug Patent Watch. Lurbinectedin. https://www.drugpatentwatch.com/p/tradename/LURBINECTEDIN
[2] FDA. Zepzelca (lurbinectedin) injection, for intravenous use. https://www.accessdata.fda.gov/drugsatfda_docs/label/2020/213702s000lbl.pdf
[3] Zepzelca. Home page. https://www.zepzelca.com/