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Int J Radiat Oncol Biol Phys. 2014 Jul 15;89(4):880-7. doi: 10.1016/j.ijrobp.2014.04.007. Epub 2014 May 24.

Definitive primary therapy in patients presenting with oligometastatic non-small cell lung cancer.

Author information

1
Harvard Medical School, Boston, Massachusetts.
2
Dana-Farber Cancer Institute, Boston, Massachusetts.
3
Dana-Farber Cancer Institute, Boston, Massachusetts; Brigham and Women's Hospital, Boston, Massachusetts.
4
Dana-Farber Cancer Institute, Boston, Massachusetts; Brigham and Women's Hospital, Boston, Massachusetts. Electronic address: achen@lroc.harvard.edu.

Abstract

PURPOSE:

Although palliative chemotherapy is the standard of care for patients with diagnoses of stage IV non-small cell lung cancer (NSCLC), patients with a small metastatic burden, "oligometastatic" disease, may benefit from more aggressive local therapy.

METHODS AND MATERIALS:

We identified 186 patients (26% of stage IV patients) prospectively enrolled in our institutional database from 2002 to 2012 with oligometastatic disease, which we defined as 5 or fewer distant metastatic lesions at diagnosis. Univariate and multivariable Cox proportional hazards models were used to identify patient and disease factors associated with improved survival. Using propensity score methods, we investigated the effect of definitive local therapy to the primary tumor on overall survival.

RESULTS:

Median age at diagnosis was 61 years of age; 51% of patients were female; 12% had squamous histology; and 33% had N0-1 disease. On multivariable analysis, Eastern Cooperate Oncology Group performance status ≥ 2 (hazard ratio [HR], 2.43), nodal status, N2-3 (HR, 2.16), squamous pathology, and metastases to multiple organs (HR, 2.11) were associated with a greater hazard of death (all P<.01). The number of metastatic lesions and radiologic size of the primary tumor were not significantly associated with overall survival. Definitive local therapy to the primary tumor was associated with prolonged survival (HR, 0.65, P=.043).

CONCLUSIONS:

Definitive local therapy to the primary tumor appears to be associated with improved survival in patients with oligometastatic NSCLC. Select patient and tumor characteristics, including good performance status, nonsquamous histology, and limited nodal disease, may predict for improved survival in these patients.

PMID:
24867533
DOI:
10.1016/j.ijrobp.2014.04.007
[Indexed for MEDLINE]

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