Should it be flowers?
We recently had a co-worker who had to take a leave of absence due to cancer treatments. We initially were going to send flowers, but another co-worker who is a cancer survivor said that flowers could be associated with death, and can sometimes be taken the wrong way.
We instead sent fresh fruit, natural juices that were to help with energy and strength, and gift cards for food delivery.
When she completed her treatment and was cleared to come back to work, she said all the gifts came in handy and were greatly appreciated.