• Age ≥ 18 years old

• Patients with one of the following indications:

• Locally advanced unresectable or metastatic PDAC with disease progression following, or intolerance to cytotoxic chemotherapy, unless patient was ineligible to receive such therapy

• Locally advanced unresectable or metastatic NSCLC without any actionable genomic alterations with disease progression following, or intolerance to chemotherapy and immunotherapy, unless patient was ineligible to receive such therapy, or locally advanced unresectable or metastatic NSCLC with an actionable genomic alteration with disease progression following, or intolerance to targeted therapy, unless patient was ineligible to receive such therapy

• Locally advanced unresectable or metastatic HR+/HER2- ductal or lobular BC with disease progression following, or intolerance to, at least 2 lines of therapy, unless patient was ineligible to receive such therapy

• Locally advanced unresectable or metastatic TNBC with disease progression following, or intolerance to, at least 2 lines of therapy, unless patient was ineligible to receive such therapy

• (Dose escalation part only) Locally advanced or metastatic unresectable CRC with disease progression following, or intolerance to cytotoxic chemotherapy, unless patient was ineligible to receive such therapy. Patients with known microsatellite instability-high (MSI-H) or mismatch repair deficient (dMMR) status must also have had disease progression following, or intolerance to immune checkpoint inhibitor therapy, unless patient was ineligible to receive such therapy

• Patients must have lesions showing 68Ga-NNS309 uptake