I agree with where you are coming from in terms of taking with a grain of salt for now but, the article clearly states that, "more than 90% of different cancers have MUC1 on their cells, which indicates the potential for this vaccine." 90% is a lot more than the few cancers you mentioned.
It's still a ways off (six years according to the article) and the clinical trials do not include melanoma but it still sounds very promising if it's all true.
