All the samples we collect are taken when you are having samples taken anyway as part of your treatment.

In some cases, you will be asked for a little bit extra (a teaspoon of blood) and in others you will be asked to donate what is left over.

We collect blood, bone marrow (from people with leukaemia or bone cancer), spinal fluid (if a sample is being taken anyway) and small pieces of tumour.  You will never need an extra procedure.