[Occupational head and neck cancer: Part II: Not-registered occupational diseases].

Substances such as cement dust, polycyclic aromatic carbonhydrates (PAC), diesel exhaust and lubricatant cooling may contribute to the formation of cancer, but are not yet recognized as to be causing occupational cancer. By decree, these diseases can be recognized for compensation when there is enough new evidence for causality. The knowledge about these conditions is crucial for judgement. The technical supervisory board of the Employer's Liability Insurance Association should be asked to report information about the working place concentration of the accused substances before a decision can be made, because life-style factors (alcohol, smoking, nutrition) may contribute also.