TABLE 2.
DSS rate (%)* |
|||||||
---|---|---|---|---|---|---|---|
Factor | Median OS, mo | Median DSS, mo | 1 y | 2 y | 3 y | 5 y | 10 y |
All salivary duct carcinoma (n = 228) | 79 | >120† | 91 | 82 | 78 | 64 | 56 |
Age at diagnosis, y | |||||||
≤50 (n = 33) | >120† | >120† | 100 | 94 | 94 | 86 | 78 |
51–60 (n = 45) | 58 | >120† | 95 | 85 | 77 | 54 | 54 |
61–70 (n = 65) | 50 | 59 | 85 | 79 | 72 | 49 | 35 |
>70 (n = 85) | 74 | >120† | 89 | 78 | 76 | 70 | 62 |
p < .001‡ | p = .01‡ | ||||||
Sex | |||||||
Male (n = 166) | 80 | >120† | 92 | 84 | 79 | 64 | 56 |
Female (n = 62) | 80 | >120† | 86 | 79 | 77 | 62 | 58 |
p = .90‡ | p = .77‡ | ||||||
Primary site | |||||||
Parotid only (n = 163) | 78 | >120† | 91 | 82 | 77 | 62 | 58 |
Submandibular only (n = 33) | 45 | 58 | 94 | 80 | 76 | 48 | 35 |
p = .57‡ | p = .20‡ | ||||||
Tumor grade | |||||||
Well or moderately differentiated (n = 29) | >120† | >120† | 89 | 89 | 89 | 89 | 71 |
Poorly or undifferentiated (n = 120) | 47 | 56 | 90 | 79 | 73 | 47 | 44 |
p value = .02‡ | p value = .02‡ | ||||||
Overall stage | |||||||
I or II (n = 78) | >120† | >120† | 96 | 91 | 90 | 84 | 76 |
III (n = 49) | 86 | >120† | 96 | 88 | 86 | 67 | 67 |
IV-A or IV-B (n = 85) | 40 | 46 | 90 | 76 | 69 | 45 | 40 |
IV-C (n = 13) | 15 | 17 | 54 | 46 | 35 | 12 | 0 |
p < .001‡ | p < .001‡ | ||||||
SEER historic stage | |||||||
Localized (n = 83) | >120† | >120† | 96 | 92 | 91 | 86 | 78 |
Regional (n = 98) | 51 | >120† | 93 | 84 | 76 | 54 | 51 |
Distant (n = 44) | 38 | 40 | 76 | 60 | 56 | 29 | 20 |
p < .001‡ | p < .001‡ | ||||||
Lymph node status | |||||||
Negative (n = 114) | >120† | >120† | 95 | 90 | 88 | 80 | 73 |
Positive (n = 111) | 44 | 48 | 87 | 74 | 68 | 44 | 38 |
p < .001‡ | p < .001‡ | ||||||
Tumor size | |||||||
≤2 cm (n = 85) | 84 | >120† | 94 | 90 | 86 | 66 | 55 |
>2–3 cm (n = 50) | 95 | >120† | 96 | 88 | 79 | 75 | 75 |
>3 cm (n = 58) | 43 | 46 | 83 | 64 | 64 | 47 | 42 |
p value = .03‡ | p value = .006‡ |
Abbreviations: OS, overall survival; DSS, disease-specific survival; SEER, Surveillance, Epidemiology, and End Results.
Absolute survival rates.
Median not reached at 10-year follow-up.
Based on log-rank test.