“almost half the patients were cancer-free a year later.”

One of the things I learned going through my own treatment (prostate) was that everyone's cancer is different. Which makes sense if you think about the variability in malignant cell growth.

So something that cures half the patients and only requires an office or outpatient visit every few weeks (no surgery, no radiation) is astounding. This result will likely lead to further research using this approach.

More than half would be nice, but: these tests were run on "individuals with high-risk non-muscle-invasive bladder cancer whose cancer had previously resisted treatment." One could expect that it would be even more effective on patients whose cancers were not resistant to treatment.

That's one way of looking at the glass half empty.

If half of people get rid of cancer for 1 year that is still outstanding - ESPECIALLY if the majority of those remain cancer free for quite some time after.