Abstract: The invention relates to a bioactive fraction of Petiveria alliacea having an antitumour activity, and to the use of same for producing medicaments for treating cancer. The invention also relates to a pharmaceutical combination for treating, comprising the bioactive fraction of Petiveria alliacea and at least one immunostimulant that can produce the phenotypic and/or functional maturation of the dendritic cells. The invention further relates to sequential administration of the bioactive fraction of Petiveria alliacea or the composition containing same and immunostimulant agent.