can anyone work out what this exam question is asking?

[katelucas84]

Q1. a) Outline the different sources from which specimens may be obtained for the detection of primary and secondary malignant tumours. (40 marks) b) Discuss the morphological features seen in this type of diagnosis and how they relate to tumour aggressiveness. (60 marks)

Its an example question for biomedical science degree finals. Is sources referring to biopsies etc? or anatomically