The main purpose of this study is to evaluate the effectiveness of technetium \[99mTc\]-H7ND injection in the diagnosis of peritoneal metastasis of gastrointestinal malignant tumor. Objective: To evaluate the safety of technetium \[99mTc\]-H7ND injection in the diagnosis of peritoneal metastasis of gastrointestinal malignant tumor. Objective: To explore the diagnostic threshold of technetium \[99mTc\]-H7ND injection for peritoneal metastasis of gastrointestinal malignant tumor.
Adults over 18 years of age (based on the time when the informed consent form was signed) can be male or female;
Subjects with gastrointestinal malignant tumor confirmed by histology/cytology;
Subjects to be surgically removed or explored;
The estimated survival time is ≥12 weeks;
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