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In oncology, the identification of targets that correlate with a type of cancer has led to a profound change in the notion of "tumor markers". Technological advances, in particular the development of high-throughput sequencing, have led to the emergence of a new generation of molecular biomarkers for tumors. Despite their limited utility for screening and diagnosis, conventional tumor markers remain interesting for evaluation of prognoses, the choice and optimization of treatments, as well as for monitoring the effectiveness of those treatments. In this article, we revisit the conventional serum markers that are enjoying a 'come back' thanks to the development of high-performance scores based on biological, cytological, clinical, or radiological criteria.

Ovarian yolk sac tumour (OYST) is a very rare malignancy arising most often in young women. Preoperative clinical, biological (alpha-foetoprotein) and radiological findings should help to establish the diagnosis of OYST, in order to propose adequate surgical treatment. The aim of surgery is to remove the primary tumour, to obtain an accurate histological diagnosis and to assess the disease extent. In young women, fertility-sparing surgery should be performed, in order to preserve the possibility of pregnancy later on. Chemotherapy has substantially modified the prognosis of these tumours, and practically all patients will be cured. The overall 5-year survival rate is 94% when patients are treated with BEP chemotherapy. Depending on the clinical situation, two to four cycles of the BEP regimen should be administered after surgery. Identification of prognostic factors may help to propose risk-adapted treatment in order to increase the cure rate in patients with a poor prognosis and to decrease toxicity in patients with a low risk of relapse. Fertility preservation represents a major objective in women treated for OYSTs.

Ovarian yolk sac tumour (OYST) is a very rare malignancy arising most often in young women. Preoperative clinical, biological (alpha-foetoprotein) and radiological findings should help to establish the diagnosis of OYST, in order to propose adequate surgical treatment. The aim of surgery is to remove the primary tumour, to obtain an accurate histological diagnosis and to assess the disease extent. In young women, fertility-sparing surgery should be performed, in order to preserve the possibility of pregnancy later on. Chemotherapy has substantially modified the prognosis of these tumours, and practically all patients will be cured. The overall 5-year survival rate is 94% when patients are treated with BEP chemotherapy. Depending on the clinical situation, two to four cycles of the BEP regimen should be administered after surgery. Identification of prognostic factors may help to propose risk-adapted treatment in order to increase the cure rate in patients with a poor prognosis and to decrease toxicity in patients with a low risk of relapse. Fertility preservation represents a major objective in women treated for OYSTs.