Based on the provided sources, there is no specific information available regarding whether lurbinectedin can pass into breast milk. The drug patent information [1] and the drug details on WebMD [2] do not mention anything about the presence of lurbinectedin in breast milk. Additionally, the drug information on DailyMed [3] does not provide any specific details about the excretion of lurbinectedin in breast milk.

It is important to note that the lack of information on the presence of lurbinectedin in breast milk does not necessarily mean that it is safe to use while breastfeeding. In general, it is recommended to consult with a healthcare professional or a lactation specialist before taking any medication while breastfeeding. They can provide personalized advice based on the specific situation and the potential risks and benefits of using lurbinectedin.

It is crucial to prioritize the health and safety of both the mother and the baby. If lurbinectedin is an essential medication for the mother, alternative feeding options or temporary cessation of breastfeeding may be considered. A healthcare professional can provide guidance on the best course of action based on the individual circumstances.

In conclusion, based on the available information, it is unclear whether lurbinectedin can pass into breast milk. It is important to consult with a healthcare professional before taking lurbinectedin or any other medication while breastfeeding to ensure the safety of both the mother and the baby.

Sources:
[1] Drug Patent Watch. Lurbinectedin Trademark Information. Retrieved from https://www.drugpatentwatch.com/p/tradename/LURBINECTEDIN
[2] WebMD. Lurbinectedin Intravenous: Uses, Side Effects, Interactions, Pictures, Warnings & Dosing. Retrieved from https://www.webmd.com/drugs/2/drug-179563/lurbinectedin-intravenous/details
[3] DailyMed. Lurbinectedin. Retrieved from https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=632bb50c-3bcb-4c85-9056-fc33410550ae