M.F. De Boer

Differential expression of SOX17 and SOX2 in germ cells and stem cells has biological and clinical implications

Combined action of SOX and POU families of transcription factors plays major roles in embryonic development. In embryonic stem cells, the combination of SOX2 and POU5F1 (OCT3/4) is essential for maintaining the undifferentiated state by activating pluripotency‐linked genes, and inhibition of genes involved in differentiation. Besides embryonic stem cells, POU5F1 is also present in early germ cells, primordial germ cells, and gonocytes, where it has a role in suppression of apoptosis. Here we demonstrate that SOX2 is absent in germ cells of human fetal gonads, and as expected carcinoma in situ (CIS), ie the precursor lesion of testicular germ cell tumours of adolescents and adults (TGCTs), and seminoma. Based on genome‐wide expression profiling, SOX17 was found to be present, instead of SOX2, in early germ cells and their malignant counterparts, CIS and seminoma. Immunohistochemistry, western blot analysis, and quantitative RT‐PCR showed that SOX17 is a suitable marker to distinguish seminoma from embryonal carcinoma, confirmed in representative cell lines. Aberrant SOX2 expression can be present in Sertoli cells when associated with CIS, which can be misdiagnosed as embryonal carcinoma. In conclusion, this study demonstrates the absence of SOX2 in human embryonic and malignant germ cells, which express SOX17 in conjunction with POU5F1. This finding has both diagnostic and developmental biological implications. It allows the identification of seminoma‐like cells from embryonal carcinoma based on a positive marker and might be the explanation for the different function of POU5F1 in normal and malignant germ cells versus embryonic stem cells. Copyright

The association of psycho-social factors and survival in head and neck cancer

Objective:  Update a previous review examining associations between psycho‐social factors and survival in head and neck cancer patients.

Psychosocial consequences for partners of patients after total laryngectomy and for the relationship between patients and partners

OBJECTIVE This study explored the long-term impact of a Total Laryngectomy (TL) on the partner and on the relationship between laryngectomees and their partners. METHODS 151 laryngectomees and 144 partners completed questionnaires assessing the psychosocial impact of a TL on the partner (quality of life, anxiety and depression, loss of control, fear, hopelessness, post-traumatic growth, caregiving burden) and on the spousal relationship (change in the quality of the spousal relationship and openness to discussion of the illness in the family). RESULTS A considerable number of partners of laryngectomees experience a psychosocial impact of the consequences of the TL, specifically on their social life (35%) and on their sexual relationship (31%). Also, the tendency of other people to neglect their laryngectomized life companion, affects more than half of the partners negatively. Clinical levels of anxiety and depression were found in around 20% of the partners. The consequences of a TL has a negative change on the sexual functioning for more than 30% of both laryngectomees and partners, the communication for around one fifth of both laryngectomees and partners, and feelings of dependency of the partner for one third of the laryngectomees. CONCLUSIONS A TL has a considerable impact on the psychosocial life of partners of laryngectomees and on the spousal relationship. The findings of this explorative study sets the stage for structural screening on the need for support, not only for patients, but also for their partners. Sexuality and intimacy should be part of this screening.