Lurbinectedin is a medication used to treat certain types of cancer, including small cell lung cancer and metastatic solid tumors. While it is a relatively new drug, it has shown promising results in clinical trials [2]. However, it is not the only medication available for these types of cancer. There are several alternative medications that may be used depending on the specific type and stage of cancer.

For small cell lung cancer, other chemotherapy drugs such as cisplatin and etoposide are commonly used [3]. Immunotherapy drugs such as atezolizumab and durvalumab may also be used in combination with chemotherapy for certain patients [3].

For metastatic solid tumors, treatment options depend on the type of cancer. Chemotherapy drugs such as doxorubicin and gemcitabine may be used for certain types of cancer [3]. Targeted therapy drugs such as bevacizumab and cetuximab may also be used for certain types of cancer [3].

It is important to note that the specific treatment plan for an individual patient will depend on several factors, including the type and stage of cancer, the patient's overall health, and other individual factors. Therefore, it is important to consult with a healthcare professional to determine the best treatment plan for each individual patient.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LURBINECTEDIN
[2] https://www.cancer.gov/about-cancer/treatment/drugs/lurbinectedin
[3] https://reference.medscape.com/drug/zepzelca-lurbinectedin-4000075