Lurbinectedin is a medication used to treat certain types of cancer. However, it is not clear whether it can be passed through breast milk. The FDA has not provided information on whether or not lurbinectedin can be passed through breast milk [2]. The manufacturer's website for lurbinectedin, Zepzelca, does not mention whether the drug can be passed through breast milk either [3]. Further research is necessary to determine whether or not lurbinectedin can be passed through breast milk. It is important for nursing mothers to consult with their healthcare provider before taking any medications to ensure the safety of their infant [1].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LURBINECTEDIN
[2] https://www.accessdata.fda.gov/drugsatfda_docs/label/2020/213702s000lbl.pdf
[3] https://www.zepzelca.com/faq/