PROACC-1A PHASE 2, RANDOMIZED, DOUBLE-BLIND, PLACEBO-CONTROLLED STUDY TO INVESTIGATE THE EFFICACY, SAFETY AND TOLERABILITY OF PONSEGROMAB IN PATIENTS WITH CANCER, CACHEXIA, AND ELEVATED CONCENTRATIONS OF GDF-15, FOLLOWED BY AN OPTIONAL OPEN-LABEL TREATMENT PERIOD (PROACC -1)

A 12 week double blind study to evaluate the efficacy, safety and tolerability of ponsegromab compared to placebo in patients with cancer, cachexia, and elevated GDF 15. During the initial 12-week treatment period (Part A), a total of 3 doses of ponsegromab or placebo will be administered 4 weeks apart subcutaneously. Each dose contains two injections. Part B is an optional open-label treatment period consisting of ponsegromab administered every 4 weeks subcutaneously for up to one year. Part B does not include placebo. Assessments include: * Body weight measurements * Measure the impact of ponsegromab compared to placebo on physical activity. * Measure the impact of ponsegromab compared to placebo on appetite, fatigue, nausea, vomiting and physical function questionnaires. * Blood samples to evaluate safety and additional endpoints including the amount of study drug in the blood and the effects of the study drug on levels of GDF15 * Up to 3 additional blood samples (two samples during Part A and one sample during Part B, if relevant) in a subset of participants as part of a substudy for more comprehensive assessment of the amount of study drug in the blood and of the effects of the study drug on levels of GDF-15.