The world is rarely black and white, but this argument is.

Tatu is right, Kwatts is wrong.

'A course of chemotherapy' is a specific, discrete cycle of treatment. 'Chemotherapy treatment' is simply a general description. Only the former can possibly be used in the context of the original article, unless it was written by an illiterate writer for illiterate readers.

Oh hold on, it was in The Sun, wasn't it?