Metastatic Non-Familial Adenocarcinoma Maintenance Therapy With DZ-002: Heptamine Carboxymethine Dye Conjugate

The goal of this clinical trial is to learn if drug DZ-002 works to treat adults with metastatic pancreatic adenocarcinoma. It will also learn about the safety of drug DZ-002. The main questions it aims to answer are: * To determine the appropriate dose of DZ-002; and * To assess the safety and efficacy of DZ-002. Participants will receive one of three different doses of the study drug through an IV over a 4-hour period on Days 1, 8, 15, and 22 of a 4-week period, or cycle. During the study, participants will have regular visits to the study clinic and multiple tests for safety and research purposes, including blood tests, along with other tests and scans. Participants will receive the study drug weekly in 4-week (28-day cycles) until there are side effects that cannot be tolerated, there is disease-worsening, or the researchers decide to stop. A post-treatment visit and a 30-day post-treatment follow up visit will be conducted after the last dose of study drug. Risks of DZ-002 include nausea, vomiting, diarrhea, chills, low levels of red blood cells, low levels of platelets, fatigue, skin rash, low blood pressure, and feeling unwell.