Granulocyte Colony-stimulating Factor Producing Oropharyngeal Squamous Cell Carcinoma.

CASE REPORT We report on the case of a 47-year old woman with granulocyte colony-stimulating factor (G-CSF)-producing relapsed oropharyngeal squamous cell cancer. Palliative immunotherapy with nivolumab was started. Absolute neutrophilic count increased during the course of immunotherapy and correlated with tumour progression. Under chemotherapy with weekly paclitaxel, dramatic tumour regression and decreasing absolute neutrophilic count were noted. G-CSF concentration in serum increased from 4.77 to 9.61 pg/ml during the final phase of tumour progression. Immunohistochemical staining of the initial biopsies showed that some of the tumour cells as well as infiltrating cells stained positively for G-CSF, and some of the tumour cells even stained positively for the G-CSF receptor. CONCLUSION Leukaemoid reaction in malignant disease with increased neutrophilic granulocytes has been shown to correlate with dismal prognosis in other tumours. The role of G-CSF in progression and prognosis of head and neck squamous cell carcinomas is still unclear but in patients with these tumours there seems also to be a correlation between elevated G-CSF and poor prognosis. Further systematic evaluation of G-CSF secretion in this tumour entity should clarify the role and potential treatment possibilities for these tumours