Newer Second-Round Therapies Save Lives

By Nina Mutone, MD, MDalert.com contributor.
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According to data from the International Association for the Study of Lung Cancer (IASLC) Lung Cancer Staging Project, the 5-year survival rates after complete surgical resection are 73% for stage IA, 58% for stage IB, 46% for stage IIA, 36% for stage IIB, and 24% for stage IIIA.3 The majority of cases of recurrent lung cancer are characterized by distant metastases with locoregional recurrence; other cases may have distant metastases alone (oligometastases) or locoregional recurrence alone.4

The overall incidence of locoregional or advanced-stage recurrent lung cancer is approximately 33%, with a median time of 11.5 months to recurrence.5 Factors that independently predict outcome after surgical resection of early-stage NSCLC include sex, staging, vascular endothelial growth factor score, and percent nuclear cyclin D1 expression.6 In patients with advanced, unresectable disease, recurrence is usual, with a median survival time of 8 to 11 months.7

Extracellular S100 proteins have been shown to exert regulatory effects on inflammatory cells, neurons, astrocytes, microglia, and endothelial and epithelial cells.21 Dysregulated expression of multiple members of the S100 protein family is a common feature of human cancers. Due to the regulatory effects of the S100 protein family, each type of cancer will have a unique S100 protein profile or signature. (See Figure 1.)

Figure 1. Structure of the S100B protein.


Signs of Recurrence

The signs of a recurrence depend on its location. Signs of local recurrences include cough, hemoptysis, dyspnea, wheezing, and pneumonia. Signs caused by distant metastases are related to the involved organs. (See Figure 2.) Nonspecific signs of recurrence may include fatigue, malaise, and weight loss. Signs in recurrent disease are often complicated by poor Eastern Cooperative Oncology Group (ECOG) performance status or compromised organ function resulting from surgical excision or advanced age.8

The approach to second-round care is often multidisciplinary, typically involving specialists in thoracic medicine, surgery, and radiation oncology; interventional radiology; pathology; and pulmonology. Specialist nurses may also provide care.

The early initiation of palliative care has been shown to have important benefits in patients with recurrent NSCLC. A randomized trial by Temel et al. demonstrated that patients receiving early palliative care had higher quality-of-life scores, had a more positive outlook, underwent less aggressive end-of-life care, and enjoyed longer median survival times compared with those receiving standard care alone.9 Multidisciplinary care models may facilitate the integration of palliative care into routine clinical care.10


Figure 2. Lung cancer metastasis to the brain.


Management of Recurrence

Traditional chemotherapy (cytotoxic). The traditional standard of care for recurrent disease involving distant metastases with or without locoregional recurrence is systemic chemotherapy based on recommended agents for unresectable advanced primary disease. For the past 10 to 15 years, adjuvant agents have been considered standard therapy for recurrent NSCLC.8

Most trials have evaluated cisplatin-containing doublets. Both taxanes and folate antimetabolites have been found to improve survival in patients with distant recurrences compared with supportive care alone.11 Local administration has been used successfully in patients who have oligometastases isolated to the brain or adrenal glands, with stereotactic radiotherapy a well-accepted standard for those who have limited brain metastases.12 Locoregional recurrent disease, defined as disease limited to the ipsilateral hemithorax and mediastinum excluding pulmonary lesions, is treated surgically in selected patients or with concurrent chemoradiotherapy.4


Modern chemotherapy (biologic).
The approaches to advanced lung cancer have changed with the advent of newer targeted therapies.13 (See Figure 3.) The discovery of the epidermal growth factor receptor (EGFR) mutation and anaplastic lymphoma kinase (ALK) fusion in adenocarcinoma-type NSCLC heralded the development of novel agents targeting these molecules. This progress has been enabled by the recognition that different molecular characteristics drive tumor biology and clinical responsiveness 14 and is reflected in the updated National Comprehensive Cancer Network (NCCN) guidelines.15

Figure 3. A model of the epidermal growth factor receptor.

Second-Round Prognosis

Survival. The location of recurrences, as well as the nature of the primary medical approach, affect the prognosis of patients with recurrent disease.4 ECOG performance status, length of the disease-free interval, presence of signs, and location of the recurrence have been identified as factors independently predicting survival after recurrence.5 A retrospective study of patients with distant metastases alone found that adenocarcinoma histology, a disease-free interval of 1 year or longer, and the use of local agents predicted post-recurrence survival.16

More recently, no adjuvant chemotherapy for the primary lung cancer and wild-type EGFR were associated with decreased post-recurrence survival.8 Early studies found post-recurrence survival rates of 15% to 20%, with a median survival time of 8 to 13 months. In contrast, Saisho et al. described a post-recurrence 2-year survival rate of 45.8%, with a median survival time of 17.7 months. Observed differences in post-recurrence survival may reflect the evolution of care toward newer agents, including EGFR-tyrosine kinase inhibitors (TKIs).8


Quality of life.
The goals in recurrent NSCLC are directed toward improving both survival and quality of life. Patient considerations regarding dosing, administration, and tolerability affect decisions regarding pharmacologic choices.7,17 Advanced age and medical comorbidities are commonly associated with recurrence and present unique quality-of-life considerations. Adverse events have been shown to have a significant negative influence on quality of life,18 emphasizing the need for the continued development of precision agents with favorable profiles for both efficacy and tolerability.

Influence of Accountable Care Organization Models
In Patients for whom First Line has Failed

New models of healthcare delivery may influence the delivery of second-round care to patients for whom first-round care has failed. Global payment systems for second-line chemotherapy, radiotherapy, and surgery will encourage outcomes-based research to identify strategies that offer the greatest benefit on survival and quality of life at the lowest cost. The multidisciplinary approach to recurrent NSCLC is in alignment with data collection and care coordination goals inherent to the performance-based medicine and accountable care models.19

The technological evolution toward molecular biological approaches is associated with increased costs, a point of focus for accountable care organizations (ACOs). Although coordinated care and shared decision making are theorized to lead to improves quality of care at lower cost, outcomes evidence specific to lung cancer is lacking. Preliminary reports of the oncology patient-centered medical home describe improvements in several operational and clinical variables in a community oncology system.20 Further research to develop analytic measures specifically for NSCLC – reflecting advances in genomics, personalized diagnosis, and novel protocols – will be needed to further elucidate the role of the ACO model in both primary and recurrent NSCLC.

References

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