Primary and secondary liver cancers are still a major medical and social problem due to the often late diagnosis and poor prognosis. Therefore meaningful biomarkers for better diagnosis, therapy stratification, and monitoring are highly needed. Beyond conventional clinical and tumor markers, immunogenic cell death (ICD) markers are promising new candidates. They comprise an inhomogeneous group of molecules that are released from apoptotic or necrotic cells. In blood, these danger-associated molecular patterns (DAMPs) such as the high-mobility group box 1 protein (HMGB1) are able to exert activating and suppressive effects on the immunity system and promote tumor growth and invasiveness.Here, we review the pathophysiology of primary and secondary liver cancer, the current therapeutic approaches, and the role of immunogenic cell death markers for the development and progression of cancer disease. Further, we report on their relevance as serum biomarkers for the diagnosis, estimation of prognosis, as well as the prediction and monitoring of response to cytotoxic therapy in cancer patients.
Key Facts• Primary and secondary liver cancers are still a major medical and social problem because they often are diagnosed late and have a poor prognosis.• Meaningful biomarkers for better diagnosis, therapy stratification, and monitoring are highly needed.Beyond conventional clinical and tumor markers, immunogenic cell death (ICD) markers are promising new candidates.• ICD markers comprise an inhomogeneous group of molecules that are released from apoptotic or necrotic cells. In blood, these danger-associated molecular patterns (DAMPs) such as the high-mobility group box 1 protein (HMGB1), calreticulin, AFP, as well as nucleosomes are able to exert activating and suppressive effects on the immunity system and promote tumor growth and invasiveness.• In the case of HMGB1, these immunologic effects are mediated by diverse toll-like receptors and the receptor of advanced glycation end products (RAGE).• While circulating, HMGB1 and nucleosomes exert pro-immunogenic effects that may be enhanced when they are present in blood in form of HMGB1-nucleosome complexes; soluble RAGE and serum DNAse act as anti-immunogenic -by binding to HMGB1 as decoy receptor and by degrading nucleosomal DNA, respectively.• In cancer patients, serum levels of HMGB1 and nucleosomes are found to be elevated and further increased already 24 h after cytotoxic therapies are applied. The extent of HMGB1 and nucleosome increase correlates with poor patient prognosis and poor response to locoregional therapies in patients with liver malignancies and in patients with diverse cancers during systemic therapies. • In contrast, serum levels of sRAGE are decreased in cancer patients and further decline 24 h after therapeutic intervention. Low sRAGE levels correlate with poor prognosis and therapy response in diverse settings.• Inclusion of ICD markers into large, prospective anticancer therapy trials is needed to validate these promising findings and to define b...