This seems like the sort of question to which the answer has to be "find a competent medical professional and ask them".
Yes, and make sure they take into account both what you are likely to contract and how much a weakened immune system affects how you will benefit from said vaccinations. Lymphoma in particular suggests that there's been a more or less reset of the immune system over the course of treatment... I have no idea if that makes a difference in effectiveness.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.