Journal
JOURNAL OF CANCER
Volume 8, Issue 3, Pages 455-459Publisher
IVYSPRING INT PUBL
DOI: 10.7150/jca.17104
Keywords
Nasopharyngeal neoplasms; Prognosis; Recurrence; Mortality; Hazard function
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Funding
- National Science & Technology Pillar Program during the Twelfth Five-year Plan Period [2014BAI09B10]
- Science and Technology Project of Guangzhou City, China [14570006]
- Planned Science and Technology Project of Guangdong Province [2013B020400004]
- National Natural Science Foundation of China [81572658, 81572962]
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Background: The changes in the risk of disease failure over time in nasopharyngeal carcinoma (NPC) remains unknown. Methods: We analyzed 749 patients treated with intensity-modulated radiotherapy in a single center. The annual hazard rates of disease failure (recurrence or death from any cause) were estimated using the life-table method. Results: In total, 41 (5.5%), 22 (2.9%) and 129 (17.2%) patients developed local, regional and distant recurrences, respectively; 149 (19.9%) patients died. Of the 600 patients who were alive at the last follow-up, 496 (82.7%) had follow-up times longer than 6 years. The 6-year failure-free survival rate was 74.8%. Older age (> 50 years) and advanced stage (III-IVB) were independent risk factors for disease failure in multivariate analysis. The hazard curve for failure risk in the whole cohort showed a sharp peak at 2 years, changed to a gradually decreasing plateau between years 3 and 5 and then declined sharply. Subgroup analyses revealed similar hazard curves in both sexes. However, the patterns of hazard curve significantly differed between high-risk (> 50 years or stage III-IVB) and low-risk (<= 50 years or stage I-II) patients. Interpretation: The failure hazard rate in NPC didn't decline in a linear manner, but displayed a sharp peak at 2 years. The patterns of hazard function significantly differed between patients with different age and stage. Further studies are warranted to confirm our results.
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