OS according to clinical stages IIB (n = 41), III (n = 36), and IVA and IVB combined (n = 12). Stages IIB versus III (P = .04); stages III versus IV (P < .001); stage IIB versus IV (P = .01); across all stages (P = .001). Analysis does not include 3 patients with stages IB/IIA disease and LCT.