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Evaluating the Addition of the Immunotherapy Drug Atezolizumab to Standard Chemotherapy Treatment for Advanced or Metastatic Neuroendocrine Carcinomas That Originate Outside the Lung
NotableRecruitment resumed after suspensionTrial sites expanded: 255 → 261 locationsShow 1 more changeShow less
Trial sites expanded: 255 → 261 locations
MinorRe-verified, no change to tracked fieldsv375
StoppedRecruitment suspendedSponsor's reason: End of Initial Phase of Multi-phase protocolSite details revised at 255 of 255 sitesv374Show 1 more changeShow less
Minor8 versionsRe-verified since Apr 1, 2026, no change to tracked fieldsv345-v352
MinorStudy sites: 242 to 243v344
MinorStudy sites: 240 to 242v343
Minor7 versionsRe-verified since Mar 19, 2026, no change to tracked fieldsv336-v342
MinorStudy Status, Contacts/Locationsv335
Minor5 versionsRe-verified since Mar 10, 2026, no change to tracked fieldsv330-v334
Stopped: an ongoing trial was terminated, suspended or withdrawn.
Notable: the trial’s plan changed such as a big move in its timeline or size, a new primary endpoint, sponsor or phase, or recruiting opened or resumed.
Minor: routine progress and housekeeping, such as sites added or enrollment closed.
This phase II/III trial compares the effect of immunotherapy with atezolizumab in combination with standard chemotherapy with a platinum drug (cisplatin or carboplatin) and etoposide versus standard therapy alone for the treatment of poorly differentiated extrapulmonary (originated outside the lung) neuroendocrine cancer that may have spread from where it first started to nearby tissue, lymph nodes, or distant parts of the body (advanced) or that has spread from where it first started (primary site) to other places in the body (metastatic). The other aim of this trial is to compare using atezolizumab just at the beginning of treatment versus continuing it beyond the initial treatment. Immunotherapy with monoclonal antibodies, such as atezolizumab, may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. Cisplatin and carboplatin are in a class of medications known as platinum-containing compounds that work by killing, stopping or slowing the growth of cancer cells. Etoposide is in a class of medications known as podophyllotoxin derivatives. It blocks a certain enzyme needed for cell division and DNA repair, and it may kill cancer cells. Giving atezolizumab in combination with a platinum drug (cisplatin or carboplatin) and etoposide may work better in treating patients with poorly differentiated extrapulmonary neuroendocrine cancer compared to standard therapy with a platinum drug (cisplatin or carboplatin) and etoposide alone.