Tree to distinguish sera from LSCC patients (n = 22) from non-cancer control sera (n = 40) using all eight antigen sets (h, s, q, a, l, n, x, m). Antigen variables selected by CART analyses are presented and labeled with the first letter designating the reactive antigen set, the second letter (g or m) designating the reactive isotype IgG or IgM, and the following number designating the antigen molecular mass in kDa. The fraction of cases correctly identified over the total number of cases is included for each terminal node.