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Hyperfractionated RT May Benefit Patients with Locally Advanced Head and Neck Cancer

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Based on a recent study published in the May edition of the International Journal of Radiation Oncology • Biology • Physics (Red Journal), the official scientific journal of the American Society for Radiation Oncology (ASTRO), patients with locally advanced squamous cell carcinoma of the head and neck treated with hyperfractionated radiation therapy (HFX) noted improved local-regional control and over a five year lapse experienced improved overall survival with no spike in toxicity.

The study which is called, "Final Results of Local-Regional Control and Late Toxicity of RTOG 9003: A Randomized Trial of Altered Fractionation Radiation for Locally Advanced Head and Neck Cancer," includes several institutional randomized Phase III trial of fractionation in locally advanced head and neck cancer. The study, which is considered the largest fractionation study conducted at this point, assessed patients who were treated with standard fractionation (SFX) as opposed to those who received HFX, accelerated fractionation with a split (AFX-S) or accelerated fractionation-continuous (AFX-C).

Patients registered in the study were age 18 years or older and had previously untreated, locally advanced squamous cell cancers of the oral cavity, oropharynx or supraglottic larynx in stage III or IV or stage II-IV carcinoma of the base of the tongue or hypopharynx. Patients with a prior (within five years) or synchronous malignancy other than nonmelanoma skin cancer were exempted from the trial. The trail amassed a total of 1,076 patients from September 30, 1991 to August 1, 1997.

Patients were randomized to four different treatment strategies: SFX (2 Gy/fraction/day to 70 Gy in 35 fractions over seven weeks), HFX (1.2 Gy/fraction, twice daily, to 81.6 Gy over seven weeks), AFX-S (1.6 Gy/fraction, twice daily, to 67.2 Gy over six weeks, with a two-week break after 38.4 Gy) and AFX-C (total dose of 72 Gy delivered over six weeks in 1.8 Gy daily fractions and additional 1.5 Gy boost field in the afternoon during the last 12 days of treatment). All treatments were delivered five days a week, and twice-daily treatments had a minimum interfraction interval of six hours.

Local-regional failure was examined at two years, at five years and at last follow-up. As of October 1, 2012, the average follow-up was 14.1 years. Toxicity and disease recurrence evaluation was performed weekly while patients underwent RT; four months following treatment completion; every three months for one-and-a-half years; every four months between one-and-a-half and three years; every six months in years three to five; and then annually until death.

Toxicities that took place less than180 days from the beginning of radiation were classified as acute, and those occurring more than180 days following RT were considered late effects. At the time of this report's analysis in October 2012, 52.7 percent of patients (568) had experienced local-regional failure, with 97.4 percent (553) happening within the first five years.head-neck

Secondary primary cancers were reported for 18.6 percent of patients (200), with 50 percent (100) reported within the first three years, and 75 percent (150) reported within the first 5.5 years. After 5.5 years following treatment, the rates of secondary malignancies decreased to less than 1 percent per year. There were no notable differences in the rates of second malignancies among all four study treatment plans.

At five years, the occurrence of grade 3, 4 or 5 toxicity, any feeding tube use following 180 days or feeding tube use at one year did not differ considerably when the SFX arm was juxtaposed to the three experimental arms. Grade 3, 4 or 5 toxicity tended to be decreased for patients treated over seven weeks as opposed to those treated over six weeks (9.0 percent vs. 16.7 percent, respectively), and 4.8 percent of disease-free patients treated with HFX had feeding tubes compared to 13.0 percent of patients treated with AFX-C.

At five-years after treatment, patients in the HFX arm had the highest overall survival rates at 37.1 percent (HR 0.81, 95 percent CI), as opposed to 33.7 percent for the AFX-C arm, 29.3 percent for the SFX arm, and 29.0 percent for the AFX-S arm.

"This study, one of only a few large studies to have follow-up beyond five years, demonstrates that patients who have head and neck cancers and who are being treated with radiation therapy alone have improved local-regional control and no increase in late toxicity when radiation therapy is delivered twice a day in two smaller doses which we call hyperfractionation," said lead author of the study and professor of radiation oncology, otolaryngology and hematology/medical oncology at the Winship Cancer Institute of Emory University School of Medicine in Atlanta, Jonathan J. Beitler, MD, MBA, FASTRO.

"The decrease in the rate of new cancers was unexpected; however, the large database and the long follow-up provided us with a window into information that had not previously been available about the long-term patterns of head and neck tumors and is particularly heartening. The results suggest that twice-daily radiation may improve cure and limit late side effects for patients. Twice-daily radiation might be worth considering in place of concurrent chemoradiotherapy for those patients who are at low risk for distant metastases and those patients who cannot tolerate systemic therapy."


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