Table 5.

Stage-specific median overall survival (OS) in months according to the 6th and 7th editions of the American Joint Committee on Cancer (AJCC) staging system. Median OS is not presented for 6th edition stages III (n = 7) and IV (n = 4). Differences in OS between the four main stage groups of the 6th and 7th editions were highly statistically significant (log-rank P = 0.002 and P < 0.001, respectively), as well as when sub-stages were considered (both P < 0.001)

	6th edition AJCC			7th edition AJCC
	n	Median OS	95% CI	n	Median OS	95% CI
0	11	80	26–135	11	80	26–135
I	109	48	26–70	35	65	33–97
Ia	36	65	33–98	–	–	–
Ib	73	41	32–49	–	–	–
II	175	33	25–41	133	46	30–61
IIa	100	48	35–61	–	–	–
IIb	75	21	18–24	–	–	–
III	–	–	–	78	27	22–32
IIIa	–	–	–	20	40	25–55
IIIb	–	–	–	58	26	19–34
IV	–	–	–	49	24	19–28
IVa	–	–	–	41	26	17–35
IVb	–	–	–	8	17	3–31

Results for the main stage groupings are shown in bold.

95% CI, 95% confidence interval.