This is a clinical study evaluating the safety, tolerability, pharmacokinetics (PK), and preliminary efficacy of SXRN Injection in cancer patients with anorexia-cachexia. Phase Ia employs a single-arm, open-label, dose-escalation design. Phase Ib, an extension of the study, utilizes a design of combination therapy with standard anti-tumor therapy for cancers including but not limited to pancreatic cancer, non-small cell lung cancer (NSCLC), and colon cancer.