the present disclosure provides a novel antineoplastic extract obtained from deschampsia antarctica plant . active components of the antineoplastic extract are also disclosed and a method to prevent proliferation of cancerous or tumorous cells with the extract or with components thereof is disclosed . furthermore , a method to induce production of active ingredients in in vitro grown plants by submitting the plants to physical or chemical treatements before preparing the antineoplastic extract is disclosed . this disclosure provides compostions of tablets and pellets for treating patients with cancer or for prevention of occurence of cancerous diseases .