Lurbinectedin With Berzosertib, an ATR Kinase Inhibitor in Small Cell Cancers and High-Grade Neuroendocrine Cancers

Participants meeting inclusion and exclusion criteria will receive lurbinectedin (on day 1) and berzosertib (on day 1 and 2) administered every 21 days (1 cycle), either in the in-patient or out-patient setting, until disease progression or development of intolerable side effects.

Participants meeting inclusion and exclusion criteria will receive lurbinectedin (on day 1) and berzosertib (on day 1 and 2) administered every 21 days (1 cycle), either in the in-patient or out-patient setting, until disease progression or development of intolerable side effects.