Complications of Chemoradiotherapy for Locally Advanced Non-Small-Cell Lung Cancer

June 1, 2007

Approximately one-third of patients with non-small cell lung cancer (NSCLC) present with locally advanced disease, the majority of whom are treated with concurrent chemotherapy and thoracic radiation therapy. Concurrent chemoradiation therapy is superior to sequential chemotherapy followed by thoracic radiation therapy or thoracic radiation therapy alone.

Click here to earn Continuing Medical Education Credit

 

Introduction

Approximately one-third of patients with non-small cell lung cancer (NSCLC) present with locally advanced disease, the majority of whom are treated with concurrent chemotherapy and thoracic radiation therapy. Concurrent chemoradiation therapy is superior to sequential chemotherapy followed by thoracic radiation therapy or thoracic radiation therapy alone.1-3 However, this improvement in survival is achieved at the expense of increased toxicity. As a significant proportion of patients treated with chemoradiation therapy develop acute and delayed complications, skillful management of these problems is essential. This article summarizes the diagnosis and management of unique complications associated with chemoradiation therapy for locally advanced NSCLC.

Acute Complications

Esophagitis

The incidence of acute severe esophagitis varies from 1.3% with radiation therapy alone to 14%-52% with concurrent chemoradiation therapy.4,5 The definition of moderate and severe esophagitis (grade 3 and 4) has been defined variously. The most current version of the National Cancer Institute-Common Toxicity Criteria (NCI-CTC) definition emphasizes the need for nutritional requirement and complications in the grading of esophagitis. Those who require a gastrostomy tube would be designated as having grade 3 esophagitis and those with complications such as perforation and stricture would be defined as having grade 4 esophagitis. Patients with grade 1 esophagitis are diagnosed incidentally when endoscopy is performed for other reasons. The reported incidence of severe esophagitis (grades 3 and 4) varies from 1% with standard once-daily radiation therapy to 52% with chemotherapy (cisplatin, gemcitabine [Gemzar]) and radiation therapy.5

Factors predisposing patients to develop severe esophagitis include radiation dose, fractionation (a twice-daily regimen poses a higher risk than a once-daily regimen), use of concurrent chemotherapy, and the volume of the esophagus receiving at least 55 Gy (Table 1). Advanced age (70 years or older) may increase the likelihood of severe esophagitis as well.

Click to enlarge

The Radiation Therapy Oncology Group (RTOG 9410) conducted a randomized study  comparing sequential chemotherapy (cisplatin and vinblastine) followed by standard radiation therapy with platinum-based chemotherapy administered concurrently with standard radiation therapy or hyperfractionated radiation therapy.6 In this study, elderly patients (70 years or older) had a higher incidence of esophagitis than did younger patients. This difference was noticed regardless of whether radiation therapy was administered once daily (42% vs 33%) or twice daily (60% vs 42%).

The symptoms of acute radiation-induced esophagitis usually begin in the second or third week of radiation therapy, when patients have received around 18-30 Gy. The symptoms often begin with difficulty in swallowing solids and sometimes progress to worsening dysphagia for liquids and painful swallowing (odynophagia) and persistent pain requiring narcotics or intravenous hydration. The severity of esophagitis reaches its peak at around 1 month in about one-fourth of patients and at around 2 months in one-third of patients.4 Although the severity of esophagitis is often well documented in prospective studies, the data on the duration of symptomatic esophagitis affecting quality of life are sparse. A few patients with acute severe esophagitis may develop esophageal stricture requiring dilatation several months after the completion of radiation therapy.

Treatment of acute esophagitis is entirely symptomatic. A bland diet that would not irritate the already inflamed esophagus is recommended. An oral suspension mixture consisting of a local anesthetic (lidocaine), surface-coating agent (diphenhydramine), and nystatin mixture taken before meals may offer some transient symptomatic relief for patients with mild to moderately severe esophagitis. At this phase, it is critical to provide dietary counseling to maintain adequate caloric and fluid intake. Patients with severe esophagitis may require intravenous fluids and placement of a gastrostomy/jejunostomy tube for enteral feeding. Parenteral nutrition should be avoided, if possible, in view of the associated risks (chiefly infection-related complications). Endoscopic evaluation may be necessary in some patients suspected of superadded fungal or viral infections.

Amifostine (Ethyol), an organic thiophosphate that is converted to its active metabolite by cellular alkaline phosphatase, has been evaluated as a possible treatment alternative for patients with radiation-induced esophagitis. The data on the ability of amifostine to prevent or ameliorate radiation-induced esophagitis are somewhat conflicting. Greek investigators reported  a significant decrease (41%) in the incidence of esophagitis with the use of amifostine along with concurrent chemoradiation therapy compared with chemoradiation therapy alone.7,8  Similar results have been reported in small studies  from the United States and Singapore.9,10 However, a larger US cooperative group phase III study (RTOG 9801) involving 243 patients treated with chemoradiation therapy reported no reduction in the development of severe esophagitis (as defined by the NCI-CTC and physician assessment) with the addition of amifostine.11 At this time, amifostine is not used regularly in the United States for the prevention of esophagitis in patients receiving concurrent chemoradiation therapy for locally advanced NSCLC.

Fatigue

Fatigue is a common problem in patients with cancer. In one study, fatigue was reported to be present in more than 75% of patients undergoing radiation therapy for lung cancer.12 Fatigue is related to the disease process itself; radiation therapy; chemotherapy; and other factors, including anemia and coexistent infections. Psychological stress and cytokine production have also been suggested as possible additional causes of fatigue in these patients. In the absence of extensive disease, radiation-related fatigue lasts a few weeks to months. Identifying and correcting reversible factors such as anemia and infection may ameliorate some of the symptoms. Unfortunately, there are no specific treatments for cancer-related fatigue. More awareness of cancer-related fatigue is absolutely necessary.

Skin Reactions

Skin reactions are common after radiation therapy. They range from erythema, dry desquamation to moist desquamation and frank ulcer to acute mild irritation to frank ulceration. Typical changes occur with higher doses of radiation (around 2,000 cGy).13 The Cancer Care Ontario’s supportive care group (SCCG) systematically reviewed the data from well over two dozen trials to find optimal strategies for prevention and treatment of skin reactions. In this review, washing with mild soap was the only method shown to be effective in preventing skin reactions. In the opinion of the SCCG experts, plain, unscented, lanolin-free hydrophobic ointment was thought to be helpful in preventing severe skin reactions.  Topical moisturizing creams, along with topical steroids, may relieve symptoms in patients with established skin reactions.

Cough

Cough, a common symptom in patients with lung cancer, is often a result of multiple factors, including the disease process, superimposed infections, and possibly inflammation of the tracheobronchial tree from radiation. Radiation pneumonitis (discussed later) develops much later in the course of treatment. Cough is managed symptomatically with either over-the-counter cough suppressants or prescription narcotics (hydromorphone, morphine).

Lhermitte's Sign

Lhermitte's sign, an infrequent sequela of radiation to the cervical spinal cord, presents as transient tingling along the spine upon neck flexion. Although this complication has been reported more commonly in patients with Hodgkin's lymphoma receiving mantle field radiation or in those receiving neck radiation, occasionally patients treated for locally advanced NSCLC report similar symptoms. After radiotherapy, some patients may complain of tingling and numbness in the back, shooting down the spine upon neck flexion. In an analysis of 40 patients who developed Lhermitte’s sign14 compared with those who did not, two factors emerged as strong predictors of eventual development of Lhermitte’s sign: the use of larger fractions (200 cGy) and total radiation exceeding 5,000 Gy to the cervical spinal cord.

Delayed Complications

Delayed complications from chemoradiation therapy typically occur a month to sometimes several years after definitive treatment. The most common delayed complication is radiation pneumonitis. Others include esophageal stricture; cardiac complications manifesting as pericardial effusion, constrictive pericarditis, or cardiomyopathy; and myelopathy.

Radiation Pneumonitis

Radiation pneumonitis (and its sequela of radiation fibrosis) is one of the devastating complications of thoracic radiation therapy. Widespread use of conformal radiation therapy has not completely eliminated the problem of radiation pneumonitis. It is critical for clinicians to understand the risk factors, clinical presentation, treatment, and prevention of radiation pneumonitis. Acute radiation pneumonitis refers to lung inflammation within 3 months of the initiation of radiation therapy. Radiation fibrosis typically occurs 6 months after radiation treatment.

The grading of severity of radiation pneumonitis differs from one cooperative group to another, with most differences noted in defining grades 2 and 3 (Table 2). The incidence of radiation pneumonitis (grade 2 or higher) varies from 15% with two-dimensional radiotherapy to anywhere between 2% and 31% with more modern conformal radiation treatment.15 The incidence of radiation pneumonitis varies depending on several components, including those related to radiation, the presence or absence of concurrent chemotherapy, and perhaps individualized factors related to cytokine production.

Click to enlarge

The most important predictor of radiation pneumonitis is the volume of lung radiated. The greater the volume of lung receiving more than 20 Gy, the higher the risk for developing radiation pneumonitis. The area of lung radiated may matter as well. Radiation to the lower lung field is associated with a greater risk of radiation pneumonitis.16,17 In an analysis conducted at our institution, the risk of radiation pneumonitis was higher when the inferior portion of the lung was radiated (44%) than when superior (16%) or middle regions (30%) of the lung were radiated.16

Several circulating factors have been studied to predict the eventual development of radiation pneumonitis, with the most extensively studied being transforming growth factor-beta (TGF-β). High levels of TGF-β in the blood have been correlated with higher rates of radiation pneumonitis.15 Other factors studied include interleukin-1 (IL-1), IL-6, surfactant, and platelet-derived growth factor (PDGF). However, none of these biomarkers is used in the clinic to predict the development of radiation pneumonitis. Moreover, these characteristics have a good one-to-one correlation in single-variable models; the sensitivity, specificity, and positive predictive values are usually low. A combination of dosimetric and clinical characteristics or dosimetric and biologic factors such as TGF-β1 levels has been shown15 to predict the development of radiation pneumonitis in retrospective studies. Prospective validation of these models is necessary to confirm these provocative findings.

The treatment of acute radiation pneumonitis includes appropriate use of bronchodilators and corticosteroids. Patients with significant and progressive hypoxia will require mechanical ventilation. There is no role for antibiotics in the treatment of radiation pneumonitis, unless there is a concern for superadded infection. Corticosteroids should be tapered gradually.

Lung fibrosis is a sequela of radiation pneumonitis. Not surprisingly, the same risk factors that predispose patients to radiation pneumonitis are associated with the development of radiation-induced lung fibrosis.

Esophageal Stricture

Radiation-induced esophageal stricture is an uncommon but devastating complication of radiation therapy for locally advanced NSCLC. In a recent study from Duke University, among 254 patients with unresectable NSCLC treated with combined-modality therapy, 10 developed symptomatic esophageal stricture.18 In this study, the location (defined endoscopically and radiologically) and the extent of the esophageal stricture corresponded to the 60 Gy isodose line. The authors suggested that limiting the length of the esophagus receiving > 60 Gy of radiation may decrease the severity of radiation-induced esophageal strictures.  It is likely that high-dose/accelerated thoracic radiation, use of brachytherapy in addition to external-beam radiation therapy, and the use of concurrent chemotherapy along with radiation therapy may increase the risk of esophageal stricture. The addition of bevacizumab (Avastin), an inhibitor of vascular endothelial growth factor (VEGF), in combination with chemotherapy and radiation therapy in patients with limited SCLC has resulted in tracheoesophageal fistula in two patients and suspected tracheoesophageal fistula in another patient.19 Symptomatic esophageal stricture requires repeated dilatation, stents, or placement of a gastrostomy tube.

Cardiac Complications

Radiation-induced cardiac damage could result in radiation pericarditis, radiation cardiomyopathy, and premature or accelerated coronary artery disease.20,21  In addition, the heart can be affected indirectly by lung fibrosis and thoracic duct fibrosis, leading to chylothorax. Most data on long-term cardiac complications following chest radiation therapy have been obtained from patients treated successfully for breast cancer or Hodgkin’s lymphoma.

Pericarditis is the most common cardiac complication secondary to thoracic radiation therapy. Early-onset acute pericarditis, an uncommon complication, occurs occasionally during radiation therapy for a large tumor contiguous to the heart. The more common delayed pericarditis typically occurs 4 months to several years after radiotherapy. This form of pericardial inflammation presents as acute pericarditis or as chronic pericardial effusion with some degree of tamponade; it is estimated that approximately 20% of cases may result in chronic or constrictive pericarditis.21 Radiation-induced symptomatic cardiomyopathy is an uncommon problem, particularly when anthracyclines are not used in the treatment of cancer. Conduction abnormalities and valvular fibrosis are rare complications of chest radiation therapy.

Myelopathy

Occurring 6 weeks to 6 months after radiation therapy, early to delayed myelopathy is a transient complication that involves the cervical or thoracic spinal cord. This complication has been reported to occur in 3% of patients receiving at least 30 Gy of radiation (for the treatment of Hodgkin’s lymphoma involving the mantle field) and in up to 8% of patients receiving at least 50 Gy of radiation.22 Transient demyelination resulting from radiation injury to oligodendrocytes is thought to be the main pathogenetic mechanism. Patients often present with Lhermitte’s sign, as previously discussed. Imaging studies are usually unremarkable. Progressive myelopathy is an uncommon complication, seen in less than 1% of patients when exposure of the spinal cord to radiation is kept within the “safe” range (less than 45 Gy in 22 to 25 fractions).22

 CME Post-Test and Evaluation 

Continuing Medical Education Information

Complications of Chemoradiotherapy for Locally Advanced Non-Small-Cell Lung Cancer


Activity Release Date: June 1, 2007
Activity Expiration Date: June 1, 2008

 

About the Activity
This activity is based on a brief article developed as part of the E-Update Series and posted on the Web. The series is geared to oncologists and addresses new treatments of cancer or modifications thereof.

This activity has been developed and approved under the direction of Beam Institute.

Activity Learning Objectives
After reading this article, participants should be able to:

(a)   Review an assortment of acute and delayed complications associated with chemoradiotherapy for advanced non-small cell lung cancer (NSCLC).

(b)  Explore the symptoms and treatment of acute radiation-induced esophagitis.

(c)   Discuss various factors that may predict the development of radiation pneumonitis in patients undergoing thoracic radiotherapy.

(d)   Summarize the possible cardiac and myelopathic complications linked to radiotherapy involving the cervical or thoracic spine.

Target Audience
This activity targets physicians in the fields of oncology and hematology.

Accreditation
This activity has been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education through the joint sponsorship of Beam Institute and The Oncology Group. Beam Institute is accredited by the ACCME to provide continuing medical education for physicians

Continuing Education CreditAMA PRA Category 1 Credit™
The Beam Institute designates this educational activity for a maximum of 2 AMA PRA Category 1 Credit(s)™. Physicians should only claim credit commensurate with the extent of their participation in the activity.

Compliance Statement
This activity is an independent educational activity under the direction of Beam Institute. The activity was planned and implemented in accordance with the Essential Areas and policies of the ACCME, the Ethical Opinions/Guidelines of the AMA, the FDA, the OIG, and the PhRMA Code on Interactions with Healthcare Professionals, thus assuring the highest degree of independence, fair balance, scientific rigor, and objectivity.

However, Beam Institute, the Grantor, and CMPMedica shall in no way be liable for the currency of information or for any errors, omissions, or inaccuracies in the activity. Discussions concerning drugs, dosages, and procedures may reflect the clinical experience of the author(s) or may be derived from the professional literature or other sources and may suggest uses that are investigational in nature and not approved labeling or indications. Activity participants are encouraged to refer to primary references or full prescribing information resources. The opinions and recommendations presented herein are those of the author(s) and do not necessarily reflect the views of the provider or producer.

Financial Disclosures
Dr. Govindan receives research support from BMS, Eli Lilly, Genentech, Pfizer, and Sanofi-Aventis and serves on the speakers' bureau for Eli Lilly and Genentech.

Copyright
Copyright owned by Beam Institute, a division of CME LLC. Copyright 2007, CME LLC. All rights reserved.

Contact Information
We would like to hear your comments regarding this or other activities provided by Beam Institute. In addition, suggestions for future activities are welcome. Contact us at:

Address:
Director of Continuing Education
Beam Institute
11 West 19th Street, 3rd Floor
New York, NY 10011-4280

Phone: 888-618-5781
Fax: 212-600-3050
e-mail:beaminstitute@cmp.com

Disclosures:

The author(s) have no significant financial interest or other relationship with the manufacturers of any products or providers of any service mentioned in this article.

References:

References

1. Dillman RO, Herndon J, Seagren SL, Eaton WL, Green MR: Improved survival in stage III non-small-cell lung cancer: seven-year follow-up of Cancer and Leukemia Group B (CALGB) 8433 trial. J Natl Cancer Inst 1996;88:1210-1215.

2. Sause WT, Scott C, Taylor S, et al: Radiation Therapy Oncology Group (RTOG) 88-08 and Eastern Cooperative Oncology Group (ECOG) 4588: preliminary results of a phase III trial in regionally advanced, unresectable non-small-cell lung cancer. J Natl Cancer Inst 1995;87:198-205.

3. Curran WJ, Scott C, Langer C, et al: Phase III comparison of sequential vs concurrent chemoradiation for patients with unresected stage III non-small cell lung cancer (NSCLC): Initial report of Radiation Therapy Oncology Group (RTOG) 9410. Proc Am Soc Clin Oncol 2000;19:1891a.

4. Werner-Wasik M: Treatment-related esophagitis. Semin Oncol 2005;32:S60-S66.

5. Vokes EE, Herndon JE, Crawford J, et al: Randomized phase II study of cisplatin with gemcitabine or paclitaxel or vinorelbine as induction chemotherapy followed by concomitant chemoradiotherapy for stage IIIB non-small-cell lung cancer: cancer and leukemia group B study 9431. J Clin Oncol 2002;20:4191-4198.

6. Curran W, Scott C, Langer C, et al: Long-term benefit is observed in a phase III comparison of sequential vs concurrent chemo-radiation for patients with unresectable NSCLC: RTOG 9410. Proc Am Soc Clin Oncol 2003;22:621a.

7. Antonadou D: Radiotherapy or chemotherapy followed by radiotherapy with or without amifostine in locally advanced lung cancer. Semin Radiat Oncol 2002;12:50-58.

8. Antonadou D, Coliarakis N, Synodinou M, et al: Randomized phase III trial of radiation treatment +/- amifostine in patients with advanced-stage lung cancer. Int J Radiat Oncol Biol Phys 2001;51:915-922.

9. Komaki R, Lee JS, Kaplan B, et al: Randomized phase III study of chemoradiation with or without amifostine for patients with favorable performance status inoperable stage II-III non-small cell lung cancer: preliminary results. Semin Radiat Oncol 2002;12:46-49.

10. Leong SS, Tan EH, Fong KW, et al: Randomized double-blind trial of combined modality treatment with or without amifostine in unresectable stage III non-small-cell lung cancer. J Clin Oncol 2003;21:1767-1774.

11. Movsas B, Scott C, Langer C, et al: Randomized trial of amifostine in locally advanced non-small-cell lung cancer patients receiving chemotherapy and hyperfractionated radiation: radiation therapy oncology group trial 98-01. J Clin Oncol 2005;23:2145-2154.

12. Hickok JT, Morrow GR, McDonald S, Bellg AJ: Frequency and correlates of fatigue in lung cancer patients receiving radiation therapy: implications for management. J Pain Symptom Manage 1996;11:370-377.

13. Bolderston A, Lloyd NS, Wong RK, Holden L. Robb-Blenderman L; Supportive Care Guidelines Group of Cancer Care Ontario Program in Evidence-Based Care: The prevention and management of acute skin reactions related to radiation therapy: a systematic review and practice guideline. Support Care Cancer 2006;14:802-817.

14. Abbatucci JS, Delozier T, Quint R, Roussel A, Brune D: Radiation myelopathy of the cervical spinal cord: time, dose and volume factors. Int J Radiat Oncol Biol Phys 1978;4:239-248.

15. Kong FM, Ten Haken R, Eisbruch A, Lawrence TS: Non-small cell lung cancer therapy-related pulmonary toxicity: an update on radiation pneumonitis and fibrosis. Semin Oncol 2005;32:S42-S54.

16. Hope AJ, Lindsay PE, El Naqa I, et al: Modeling radiation pneumonitis risk with clinical, dosimetric, and spatial parameters. Int J Radiat Oncol Biol Phys 2006;65:112-124.

17. Yorke ED, Jackson A, Rosenzweig KE, et al: Dose-volume factors contributing to the incidence of radiation pneumonitis in non-small-cell lung cancer patients treated with three-dimensional conformal radiation therapy. Int J Radiat Oncol Biol Phys 2002;54:329-339.

18. Marks LB, Zeng J, Light K, et al: 116: Radiation-induced esophageal stricture following therapy for lung cancer: its clinical course and analysis comparing stricture length with isodose levels. Int J Radiat Oncol Biol Phys 2006;66:S66-S67.

19. Available at: www.fda.gov/medwatch/safety/2007/Avastin_DHCP_TEF_Final_April2007.pdf. Accessed May 30, 2007.

20. Schultz-Hector S, Trott KR: Radiation-induced cardiovascular diseases: is the epidemiologic evidence compatible with the radiobiologic data? Int J Radiat Oncol Biol Phys 2007;67:10-18.

21. Adams MJ, Hardenbergh PH, Constine LS, Lipschultz SE: Radiation-associated cardiovascular disease. Crit Rev Oncol Hematol 2003;45:55-75.

22. Fein DA, Marcus RB Jr, Parsons JT, Mendelhall WM, Million RR: Lhermitte’s sign: incidence and treatment variables influencing risk after irradiation of the cervical spinal cord. Int J Radiat Oncol Biol Phys 1993;27:1029-1033.