<qa>  How many x 6 mL are taken at each occasion?Blood samples are drawn before the first treatment and 2-3 months after finishing treatment. Apart from plasma and serum samples which will be used for later analysis of potential biomarkers such as IL 6 and D-serine, additional blood is collected for genomic DNA analysis. A total of 4 x 6 mL are taken at each occasion. Blood samples are stored at the regional biobank. 