IGFBP‑4 expression is adversely associated with lung cancer prognosis
- Yang Xiao
- Shan Zhu
- Wen Yin
- Xiaofan Liu
- Yi Hu
Published online on: September 21, 2017
Insulin‑like growth factor binding protein‑4 (IGFBP‑4) was reported to be associated with prognosis in several types of cancer; however, to the best of our knowledge, whether it is correlated with lung cancer has yet to be reported. In the present study, 102 pairs of lung cancer tissues and surrounding non‑cancerous tissues (SNCTs) were collected. The IGFBP‑4 levels in tissues were detected with immunohistochemistry. The relevance of IGFBP‑4 to the survival of patients was assessed. The IGFBP‑4 gene was knocked down, and its function in the proliferation of lung cancer cells was measured. The percentage of lung cancer tissues with higher IGFBP‑4 expression than SNCTs (51.9%) was increased compared with the percentage with similar (11.76%) or lower (36.27%) IGFBP‑4 expression. Patients with higher IGFBP‑1 expression exhibited a shorter median survival time. IGFBP‑1 was associated with metastasis, lung cancer stages and malignancy, but not with age, sex or tumor size. Lung cancer cells with stably knocked down IGFBP‑4 showed an inhibitory proliferation rate. The present study identified that IGFBP‑4 was adversely associated with the prognosis of lung cancer patients. IGFBP‑4 knockdown prohibited lung cancer cell growth. The present study provides a potential marker for lung cancer diagnosis and a possible target for lung cancer therapy.