My condolences, SCLC is rough. Sadly, it is different than large-cell, and the mutations are different.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8038650/

Durva is starting to show some benefit here.

https://www.cancernetwork.com/view/durvalumab-significantly-...

There is https://www.fda.gov/drugs/resources-information-approved-dru...