A human IgG1 monoclonal antibody targeting the inflammatory cytokine interleukin-1 alpha (IL1a) with potential antineoplastic, anti-cachectic and anti-angiogenic activities. Anti-IL1a monoclonal antibody MABp1 targets and binds to IL1a and prevents IL1a activity. This prevents IL1a-mediated tumorigenesis and angiogenesis. In addition, MABp1 abrogates IL1a-mediated cachexia. IL1a, an inflammatory mediator expressed on monocytes, platelets and overexpressed by certain tumors, plays a key role in the promotion of tumor cell growth, metastasis and invasion. In addition, IL1a stimulates metabolic activity in the central nervous system.