Objective: The objective of this study was to assess prospectively the clinical outcomes of low-dose prophylactic extended-field, intensity-modulated radiotherapy (IMRT) plus concurrent weekly cisplatin for patients with stage IB2-IIIB cervical cancer, positive pelvic lymph nodes (PLNs), and negative para-aortic lymph nodes (PALNs).
Methods: Thirty-two patients with stage IB2-IIIB cervical cancer with positive PLN and negative PALN were included prospectively. All lymph nodes were assessed with positron emission tomography. The PALN field, including lymphatics from the superior border of L1 to the L4-L5 interphase, was irradiated concurrently with pelvic IMRT with a prescribed dose of 40 Gy in 25 fractions. Chemotherapy consisted of cisplatin delivered weekly at a dose of 40 mg/m2. Using historical controls treated with pelvic radiotherapy, the survival curves were compared to assess the difference between the 2 treatment periods.
Results: Thirty-one patients completed the allocated extended-field IMRT, and all finished the planned pelvic IMRT and brachytherapy. Acute ≥ grade 3 gastrointestinal, genitourinary, and hematologic toxicities were seen in 2, 1, and 18 patients, respectively. During a median follow-up of 33 months, 5 patients developed out-field distant recurrences. One patient had a late grade 3 gastrointestinal complication, and 1 patient had genitourinary toxicity. The 3-year actuarial overall survival, disease-free survival, and distant metastasis–free survival for the study cohort and historic controls were 87% versus 62% (P = 0.02), 82% versus 54% (P = 0.02), and 79% versus 57% (P = 0.01), respectively.
Conclusions: Extended-field IMRT of 40 Gy to the PALN plus concurrent cisplatin can effectively eradicate subclinical disease at the PALN and improve the outcome for patients with PLN-positive stage IB2-IIIB cervical cancer.
*Department of Radiation Therapy and Oncology, China Medical University Hospital, and †College of Medicine, China Medical University, Taichung; ‡College of Medicine, Taipei Medical University, Taipei; and §Department of Obstetrics and Gynecology, China Medical University Hospital, Taichung, Taiwan.
Address correspondence and reprint requests to Shang-Wen Chen, MD, Department of Radiation Oncology, China Medical University Hospital, No. 2, Yuh-Der Rd, Taichung, Taiwan 404. E-mail: firstname.lastname@example.org.
Grant support was provided by the Taiwan Department of Health, Cancer Research Centers for Excellence (DOH101-TD-C-111-005), and International Research-Intensive Centers of Excellence in Taiwan (NSC101-2911-I-002-303).
The authors declare no conflicts of interest.
Received January 19, 2013
Accepted June 6, 2013