Continuous hyperfractionated accelerated radiotherapy with/without mitomycin C in head and neck cancers.

BACKGROUND AND PURPOSE

Radiation therapy is often the primary treatment for advanced cases of head and neck cancers not considered suitable for radical surgery. In these cases locoregional tumour control rates are low and has warranted innovative treatment modifications, such as altered fractionation schedules and combination with chemotherapy.

PATIENTS AND METHODS

From October 1990 to December 1997, 239 patients with squamous cell cancers originating in the head and neck region were randomized to one of three treatment options. Standard therapy consisting of conventional fractionation with 70 Gy in 7 weeks in 35 fractions (CF). The second treatment option consisted of a continuous hyperfractionated accelerated radiotherapy delivering a total dose of 55.3 Gy in 33 fractions over 17 consecutive days (V-CHART). The third study arm had identical fractionation and dose as the above accelerated treatment, with the additional administration of 20 mg/m(2) mitomycin C (MMC) on day 5 of treatment (V-CHART+MMC).

RESULTS

Main toxicity resulted from accelerated fractionation in confluent mucositis (Grade 3-4 in 95%) requiring nasogastral tube feeding, analgetics and antiphlogistics in the majority of cases. Haematological toxicity Grade 3-4 was seen after MMC administration in 18%. MMC administration did not influence mucosal reaction. Overall duration of mucositis was not different in the three treatment groups. Loco-regional tumour control was 31% after CF, 32% after V-CHART and 48% after V-CHART+MMC, respectively (P<0.05). Overall crude survival was 24% after CF, 31% following V-CHART and 41% after V-CHART+MMC, respectively (P<0.05). Median follow up was 48 months (assessment performed in February 1999).

CONCLUSION

Following shortening overall treatment time from 7 weeks to 17 consecutive days and dose of radiotherapy from 70 to 55.3 Gy the results in the radiotherapy only treated patients are identical. A significant improvement regarding local tumour control and survival was seen following administration of MMC to the accelerated fractionated treatment.