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Original paper

External beam radiation and high-dose-rate brachytherapy for elderly patients with gastroesophageal junction adenocarcinoma

Wei Zhang, Qifeng Wang, Tao Li, Jiahua Lv, Huiming Liu, Xitang Jia, Bo Liu, Yu Fan, Yi Wang, Junchao Wang, Lei Wu, Jinyi Lang

J Contemp Brachytherapy 2017; 9, 4: 330-337
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Purpose

Tumors of the lower esophagus and the proximal stomach are usually classified as gastroesophageal junction adenocarcinomas (GEJAC). These carcinomas are the most rapidly increasing type of tumor in many Western countries, and represent an aggressive disease with a poor prognosis [1,2]. In China, esophageal cancer (EC) occurs in 50.3% (161.3/320.8) of patients aged 60-74, and in 19.6% (62.9/320.8) of patients over 75 years of age [3]. A radiation therapy oncology group study (RTOG 8501) demonstrated a survival benefit of the addition of platinum-based chemotherapy to radiation compared to radiation alone for patients with nonsurgical EC [4,5]. RTOG 8501 only included about 23.1% (28/121) of elderly patients (≥ 70 years). Thus, the management of elderly patients with GEJAC remains a therapeutic challenge, and the most relevant treatment modalities are still being debated. Although survival improvement has been observed over the past decade, GEJAC treatment continues to be significantly influenced by age [6]. The nonsurgical management of patients with GEJAC, including the use of laser coagulation or self-expanding metallic stents with radiation, has been considered for decades to only be a palliative modality. Despite progress in surgical practice, esophagostomy is associated with significant morbidity and mortality, and 75 is often considered the age limit for this type of surgery [7]. External beam radiation therapy (EBRT) was an important treatment strategy for elderly patients. However, a few published results indicate that EBRT combined with brachytherapy in elderly patients with EC. Recently, californium-252 (252Cf) begin a clinical practice [8]. NBT is a form of high linear energy transfer (HDR-LET) radiotherapy that has been proven to be effective for treating intracavitary cancers of the cervix when used in combination with EBRT [9,10]. However, for elderly patients with GEJAC or those who have refused an operation, there have yet to be any studies on the safety and usefulness of NBT in their treatment. We performed a retrospective cohort study of 96 patients older than 69 years who were diagnosed with locally advanced GEJAC and treated with radiation therapy. The main objective was to assess the overall survival (OS) and local control rates after EBRT plus NBT for elderly GEJAC patients. We also evaluated the impact of age on treatment tolerance, prognostic factors, and patterns of failure.

Material and methods

Patients

From January 2002 until November 2012, a total of 96 consecutive patients older than 69 years with localized, advanced GEJAC were referred to our department at the Changzhi Cancer Hospital for radiotherapy and 252Cf NBT. The reasons were as follows: 20 patients were medically inoperable (5 patients were diabetic, 13 had chronic obstructive pulmonary disease, and 2 had a prior or concurrent malignancy); 9 patients refused surgery; 7 patients were too old (75 years or older; 19 of the 47 had T4 lesions); and 41 patients had unresectable lesions. All of the 96 patients were treated with EBRT combined with brachytherapy. Patients with good performance status (at least able to care for themselves) and adequate hepatic, renal, and hematologic functions were selected for curative treatment. All of the patients had adenocarcinomas. The patients’ 6th American Joint Committee on Cancer (AJCC) stages were diagnosed as stages II to III by barium examination, endoscopy, endoscopic ultrasonography, or tumor histology. All of the patients gave their informed consent before treatment, which was in accordance with the Declaration of Helsinki, and were also approved by the Ethics Committee of Changzhi Cancer Hospital. The demographic data and tumor characteristics of each group are shown in Table 1.

Radiotherapy

Megavoltage radiation therapy units were used with a minimum source-to-axis distance of 100 cm. The radiation field extended at least 3 cm superior and inferior to the tumor, with a lateral margin of at least 2 cm. The field included the lesser curvature and bottom of the stomach if the tumor was type III [11]. The boost radiation field was the same length. Multi-field techniques were used to limit the maximum dose to the spinal cord to ≤ 45 Gy. The radiation treatments were delivered 5 days/week at 2 Gy/fraction. The initial anterior-posterior parallel-oppos­ed fields received 30 Gy, and the off-cord fields received 20-30 Gy, for a total dose of 40-54 Gy in 20-27 fractions, over 4-5.5 weeks. NBT with a 1-balloon applicator (Figure 1) was used in conjunction with the 252Cf LZH-1000 remote after-loading system (Linden Science and Technology Co., Shenzhen, China). The physical characteristics of the 252Cf neutron, the characteristics of the applicator, and the process of NBT were described in detail by Liu et al. [12,13]. The dose was prescribed to the reference point, which was located at 10 mm from the center point of the source capsule in the transverse direction. The number of treatment fractions of NBT was between 3 and 5 depending on the tumor regression condition at each treatment. The dose was prescribed to the reference point, located at 10 mm in the transverse direction from the center point of the source capsule. The total radiation dose (to the reference point) given to each patient varied between 12-20 Gy-eq in 3 to 5 fractions with 3-5 Gy-eq per fraction per week. There were 4-5 fractions administered to the adenocarcinoma patients. The treatment for each patient was, therefore, completed in 3-5 weeks. The total dose to the mucosa was estimated at 8-9 Gy-eq per fraction for adenocarcinoma. Before each NBT treatment, a different amount of X-ray contrast agent was injected into the water balloon to evaluate the tumor regression condition and to decide the additional number of treatments (or fractions) needed to complete the treatment. Figure 1 shows an X-ray image taken while the applicator and the source were both inserted into a patient’s esophagus. In Figure 1, the water balloon can clearly be seen as it is filled with an X-ray contrast agent. The dose was prescribed to the reference point, which was located 10 mm from the center point of the source capsule in the transverse direction. The total radiation dose (to the reference point) given to each patient varied between 8 and 25 Gy-eq in 2 to 5 fractions, with 3-5 Gy-eq per fraction per week.

Chemotherapy

Whether the patient underwent chemotherapy, we chose the treatment regimens according to the patients’ age, Karnofsky score (KPS), tumor types, and treatment objective. Normally, patients with KPS ≥ 80 (37/37), stage III (34/37), and type III (20/37) GEJAC would undergo chemotherapy. Chemotherapy consisted of 3 cycles of a regimen with CDDP (20 mg/m2/d in 2 h infusion) and 5FU (500 mg/m2/d in continuous infusion) from days l to 4. The cycles were administered on days 1 and 29. MMC was given alone in a bolus injection on day 1 per week at 4 mg/m2. The cycles were administered on days 1, 8, 15, and 22.

Toxicity assessment and follow-up

The patients were examined weekly during the course of the EBRT. Weekly blood tests were obtained, and any admission for treatment-related complications was recorded. All adverse events were graded according to the National Cancer Institute’s Common Terminology Criteria for Adverse Events (CTCAE), version 3.0 [14]. The patients usually underwent follow-up examinations every 3-4 months after the completion of treatment. Tumor response and nodal disease were evaluated with repeated computed tomography (CT) scans, barium swallow studies, and endoscopy.

Statistical analysis

The objectives of the study were to evaluate overall acute toxicity and local-regional control rates. Death from esophageal cancer was considered a treatment failure in the survival analysis. Survival was calculated from the date of consultation until death or the last follow-up evaluation. The pattern of failure (local and/or regional vs. distant) was defined as the first site of failure. The time to first failure, time to any local failure, and time to any distant metastases were calculated from the date of consultation. Local and regional recurrence included the primary tumor and regional lymph nodes. Overall survival and local-regional control were estimated using the Kaplan-Meier method. Pearson’s χ2 test was used to assess measures of association in the frequency data. A value of p < 0.05 was considered statistically significant.

Results

Patient characteristics and treatments

The ages of the GEJAC patients who were treated with radiation therapy (NBT and EBRT) ranged from 70 to 84 years (median, 75 years). Among the 96 cases, 49 were aged 70-74 and 47 were aged ≥ 75 years. The cancer stages were categorized according to the 6th Edition of the AJCC Cancer Staging Manual, with 25 patients categorized as stage II and 71 categorized as stage III. The pathologic differentiation grades (PDG) were adenocarcinoma without pathological differentiation 64 (66.6%), and well, medium, and poor PDG were 2, 16, and 14, respectively. The detailed patient data and log-rank test are provided in Table 1.

Prognostic factors for overall survival and local-regional control

The duration of follow-up ranged from 6 to 106 months (median, 30.4 months). The median survival time for the 96 patients was 15.3 months, and the 1-, 2-, 3-, and 5-year rates for OS were 62.5%, 33.7%, 20.1%, and 7.9%, respectively. The 1-, 2-, 3-, and 5-year rates for local-regional control (LRC) were 78.7%, 57.9%, 41.8%, and 26.4%, respectively. We used the following factors for the univariate analysis of survival rates and the local control rate: sex, age, KPS, tumor type, tumor length, tumor T stage, nodal stage, clinical stage, chemotherapy, and radiation dose. Among them, age was found to have relevance to OS (p = 0.006). Age was the only factor that significantly related to LRC (p = 0.0005). In the univariate analysis, the 3-year OS (LRC) was 31.9% (62.9%) for patients aged 70-74 years and 16.1% (19.5%) for patients aged ≥ 75 years (p = 0.006 and p = 0.0005, respectively; Figures 2A and B). A total of 37 patients underwent concurrent chemotherapy. Otherwise, chemotherapy combined with NBT + EBRT did not lead to a significant improvement of the OS than the RT alone.

Patterns of failure

At the time of the analysis (May 2013), 13 patients were alive and free of disease, and 5 were alive with disease evolution. Distant metastases occurred in 16 patients (16.7%). The median time to developing distant metastases was 8.9 months. The main sites of distant metastases were the lung (n = 5), liver (n = 1), brain (n = 1), and bones (n = 2). In 7 patients, metastases developed in more than 1 organ. Additionally, 18 patients died of mixed causes, including pneumonia, cerebral hemorrhage, and heart infarction. Local-regional recurrence occurred in 42 (42/96, 43.8%) patients, with 32/42 (76.2%) occurrences outside the radiation fields and 10/42 (23.8%) occurrences inside the radiation fields. Patients ≥ 75 years (27/96, 28.1%) had increased LRC significantly more than those in the 70-74 years group (15/96, 15.6%, p = 0.008). For out-field LRC, patients ≥ 75 years (22/96, 22.9%) had increased LRC significantly more than those in the 70-74 years group (10/96, 10.4%, p = 0.006). Additionally, 7/42 had primary tumor recurrences. None of those patients underwent salvage surgery.

Treatment toxicity

All 96 patients completed the planned NBT and EBRT treatments. In terms of acute toxicity (graded according to the National Cancer Institute’s Common Terminology Criteria for Adverse Events, version 3.0), no perforations were observed during this treatment period. In total, 73 (76.0%) patients developed Grade 2 hematologic toxicity. Dysphagia was relieved after the second or third NBT treatment in 49% of the patients, and a temporary feeding tube was not required in most of the patients. Grade ≥ 2 esophagitis, expressed by clinical odynophagia, was observed in 46 cases (47.9%), and was managed with the early introduction of H2 blockers and surface anesthesia at the initiation of NBT. In total, 4 (4.1%) patients had Grade ≥ 2 irradiation dermatitis. From the time of treatment completion to the development of local-regional recurrence or death, 5 (5.2%) and 7 (7.3%) patients experienced fistulas and massive bleeding, respectively. As shown in Table 2, the incidence of severe, late complications was not related to older age. In total, 69.8% of the patients resumed normal swallowing, while 6.3% had some residual dysphagia (non-malignant stenosis) requiring intermittent dilatation. As shown in Table 3, patients who received both radiotherapy (NBT + EBRT) and chemotherapy did not have a significant increase in acute and late toxicities compared to radiotherapy alone.

Discussion

To our knowledge, this is the first reported clinical experience using NBT and EBRT for elderly patients with GEJAC. The safety and efficacy of this comprehensive treatment appear promising. We also found that, firstly, NBT + EBRT is safe and beneficial in terms of local control in the radical treatment of elderly patients with GEJAC, and secondly, the OS rate was significantly increased and the late complication rate was significantly decreased in patients aged 70-74 years compared to patients aged ≥ 75 years. No severe acute complications were reported during the treatment time. In the current study, the results in terms of OS and progression-free survival (PFS) are consistent with those published in the literature, notably in the largest cohort of 109 elderly patients treated with exclusive adjuvant radiochemotherapy (RCT) with a median OS and PFS of 15.2 and 8.3 months, respectively [15,16,17]. Rochigneux reported that age is an important prognostic factor for elderly patients undergoing treatment [16]. In our study, the best results in terms of OS were obtained for patients aged 70-74 years, and age was the only prognostic factor for OS and LRC. We believe that there are at least 2 factors that made the 252Cf-based NBT more effective for local tumors than chemotherapy regimens, particularly in the treatment of locally advanced GEJAC. The first factor is related to the high-LET nature of fission neutrons, which made them much more effective (compared to the low-LET X-ray) in killing the hypoxic tumor cells in the locally advanced cancers. The second factor is related to the fact that water is an effective neutron attenuator that can be conveniently injected into the source applicator during treatment to reduce the neutron dose to the nearby normal tissue. Because there is a significant difference in the elasticity of normal tissue and tumor tissue, the proper injection of water into the source applicator can effectively push away the nearby normal tissue, while keeping the tumor tissue close to the source. Then the water is an neutron ray protector. We estimate that 1 cm of water can reduce neutron dose by approximately 15%. Concerning RCT tolerance, Tougeron reported that age ≥ 75 years was associated with worse creatinine clearance (p < 0.01) and greater chemotherapy dose reduction at treatment onset due to age (p < 0.01), but this had no influence on the total CRT dose or OS [18]. In the current study, the incidence of late severe complications was significantly related to the factors of higher total dose and brachytherapy dose. In addition to the dose factors, the patients’ age also significantly increased the incidence of relevant, late complications. While the normally expected side effects (shown in Table 2) seem to be quite acceptable, the number of deaths (n = 20 or 10.5%) resulting from fistula, hematemesis, and hemoptysis was high. This may be linked to the late effect of radiation damage, as fatal esophagitis of fistula cases were also observed in the RTOG 92-07 trial where the 192Ir-based HDR boost dose of 15 Gy in 3 weekly fractions was deemed to be too high [19]. However, they could also have been caused by local recurrences of the cancer. From Table 4, with increased age, the severe acute and late treatment-related toxicities were not significantly increased [20,21,22,23]. Further CT review is needed to compare the pretreatment tumor length, the esophageal tumor wall thickness, and the association of tumor with surrounding normal structures with subsequent fistula formation. Compared to published data, our population was more homogeneous regarding age, pathological type, and tumor location as we chose an inferior limit at 70 years instead of 65. Furthermore, patients were selected for PS or comorbidity, similar to the study of Anderson et al., in which only patients with Karnofsky index > 70% were included. Consequently, our population can be considered as representative of routine clinical practice. The major limitation of our study was that the retrospective analysis might have been based on incomplete medical records. Other limitations were that the study was conducted in a single institution, the sample size was small, and there was a lack of predefined factors determining treatment decisions, which were based only on evaluations by the referral doctor and members of a multidisciplinary team. The aim of the study was to retrospectively identify the parameters to be associated with the key therapeutic decisions.

Conclusions

Our results suggest that elderly patients with GEJAC could benefit from NBT + EBRT without major toxicities. Its outcome is close to younger patient outcomes published in the literature. This emphasizes the fact that curative treatments for GEJAC should not be rejected based only on a patient’s age.

Acknowledgments

The authors gratefully thank Professor C.-K. Chris Wang for assistance.

Disclosure

Authors report no conflict of interest.

Funding

This work was supported by the Sichuan Province’s selected excellent projects for foundation from the science and technology projects in 2016.

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