Advances in Clinical and Experimental Medicine

Title abbreviation: Adv Clin Exp Med
JCR Impact Factor (IF) – 2.1
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Index Copernicus  – 161.11; MEiN – 140 pts

ISSN 1899–5276 (print)
ISSN 2451-2680 (online)
Periodicity – monthly

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Advances in Clinical and Experimental Medicine

2016, vol. 25, nr 3, May-June, p. 397–402

doi: 10.17219/acem/25928

Publication type: original article

Language: English

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PIK3CA Mutations in Resected Small Cell Lung Cancer

Na Han1,2,A,B,C,D, Qiao-Yuan Cheng3,B,C, Bo Chen4,C,E, Ju-Fen Cai1,2,E,F, Xiao-Jia Wang1,2,E,F, Cai-Jin Lou1,2,E,F, Jing Qin1,2,C,E, Wei-Wu Ye1,2,C,E, Lei Lei1,C,E, Hong-Yang Lu1,2,A,B,C,E,F

1 Zhejiang Key Laboratory of Diagnosis & Treatment Technology for Thoracic Oncology (Lung and Esophagus), Zhejiang Cancer Hospital, Hangzhou, People’s Republic of China

2 Department of Medical Oncology, Zhejiang Cancer Hospital, Hangzhou, People’s Republic of China

3 Zhejiang Institute for Food and Drug Control, Zhejiang Cancer Hospital, Hangzhou, People’s Republic of China

4 Department of Pathology, Zhejiang Cancer Hospital, Zhejiang Cancer Hospital, Hangzhou, People’s Republic of China

Abstract

Background. Despite advances in chemotherapy and radiotherapy in recent decades, the prognosis for small cell lung cancer (SCLC) patients is still poor. Targeted therapies in SCLC must be applied systemically to target not only the primary tumor but also metastases. The phosphatidylinositol 3-kinase (PI3K)/AKT pathways play a key regulatory function in the survival, proliferation, energy metabolism and cellular architecture advantages of malignant cells. The phosphatidylinositol 3-kinase catalytic α (PIK3CA) gene, which encodes the p110α catalytic subunit, plays a key role in the activation of AKT downstream signaling and mammary tumor progression. More than 75% of PIK3CA mutations are clustered in the helical (exon 9) and catalytic domains (exon 20). There have been very few studies reporting the PIK3CA mutations status of patients with SCLC who have undergone surgical treatment in mainland China.
Objectives. The aim of the study was to investigate the PIK3CA mutation in SCLC.
Material and Methods. Reverse transcription polymerase chain reaction (RT-PCR) and direct sequencing technology was used to detect the PIK3CA mutation in 14 cases of retrospectively collected SCLC patients who underwent surgical treatment at Zhejiang Cancer Hospital, Hangzhou, PRC, between 2002 and 2010.
Results. The research revealed no mutations in exons 9 and 20 of the PIK3CA gene. A nucleotide alteration of A1634C (E545A) of exon 9 turned out to be a pseudogene-positive, because the mutation disappeared when near-duplicate detection was employed.
Conclusion. The incidence of PIK3CA mutation is low in SCLC patients, and the pseudogene-positive alteration of A1634C is prone to occur in exon 9 of PIK3CA mutations in human cancers.

Key words

PIK3CA, gene mutation, SCLC

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