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Oral Oncol. 2016 Feb;53:67-73. doi: 10.1016/j.oraloncology.2015.11.015. Epub 2015 Dec 7.

Long-term patterns of relapse and survival following definitive intensity-modulated radiotherapy for non-endemic nasopharyngeal carcinoma.

Author information

1
Department of Radiation Oncology, Memorial Sloan-Kettering Cancer Center, New York, NY, USA.
2
Department of Radiation Oncology, Memorial Sloan-Kettering Cancer Center, New York, NY, USA. Electronic address: leen2@mskcc.org.

Abstract

BACKGROUND:

We report treatment outcomes for a large non-endemic cohort of patients with nasopharyngeal carcinoma treated with intensity-modulated radiotherapy (IMRT) and chemotherapy.

METHODS:

We identified 177 consecutive patients with newly diagnosed, non-metastatic nasopharyngeal cancer treated with definitive IMRT between 1998 and 2011. Endpoints included local, regional, distant control, and overall survival.

RESULTS:

Median follow-up was 52months. The 3-/5-year actuarial rates of local control, regional control, distant control, and overall survival were 92%/83%, 93%/91%, 86%/83%, and 87%/74%, respectively. The median time to local recurrence was 30months; the annual hazard of local recurrence did not diminish until the 6th year of follow-up.

CONCLUSIONS:

Overall, we observed excellent rates of disease control and survival consistent with initially reported results from our institution. Attaining locoregional control in patients with extensive primary tumors remains a significant clinical challenge. With mature follow-up we observed that more than half of observed local relapses occurred after 2years, a pattern distinct from that of carcinomas arising from other head and neck sites. These findings raise the possibility that patients with NPC may benefit from close follow-up during post-treatment years 3-5.

KEYWORDS:

Clinical outcomes; IMRT; Nasopharyngeal carcinoma; Radiotherapy

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