Trump claims Biden has stage 9 cancer:

[Ms. Toad]

20. I've said that in at least a half-dozen posts.

My point is that (1) most people don't know the difference between stages and grades, (2) most people don't know the range within stages (I to IV) or grades (0-3, 0-4, or - in the case of prostate cancer, 0-5 for individual grades which make up the Gleason score and grade groups - two grades added together, then placed into 5 grade groups. Grade group 5 consists of grade 4 (most prevalent cell grade)+5 (second most prevalent cell grade), 5+4 (the reverse, or 5+5) or (3) most people don't know that the grading for prostate cancer is unique.

Trump is a total idiot. But not knowing the intricacies of cancer staging and grading - especially in a cancer which is graded differently than other cancers - is not evidence that he is a total idiot. It is simply evidence that it is a confusing system.

Biden is stage IVB - distant metastasis, with - or without - nearby lymph node involvement.