The present application mainly relates to a method for determining a prognosis for a subject diagnosed with high-grade serous ovarian cancer. The method comprises determining the prognosis based on activities of at least two cellular signaling pathways including a phosphatidylinositide 3-kinase (PI3K) pathway and a nuclear factor-kappa B (NFkB or NFκB) pathway in a sample of the subject. The present application also relates to a method for identifying a subject diagnosed with high-grade serous ovarian cancer that will be suitable for a PI3K pathway targeting therapy or an NFkB pathway targeting therapy. The method comprises identifying the subject based on activities of at least two cellular signaling pathways including a PI3K pathway and an NFkB pathway in a sample of the subject. The present application further relates to corresponding apparatuses, non-transitory storage media, computer programs and kits.