Abstract
ALK fusion genes are diverse. Approximately 30 different ALK fusion protein partners have been described previously, and some of these fusion proteins have been reported to be effective against ALK-tyrosine kinase inhibitor (TKI). ALK rearrangements often occur at a common breakpoint in exon 20 of the genome. SLC8A1-ALK, a novel fusion protein partner, comes from exon 2 of the SLC8A1 gene rearranged with exon 20 of the ALK gene. Here, we reported a patient with advanced lung adenocarcinoma harboring a SLC8A1-ALK fusion who benefited from first-line treatment with alectinib. After 2 months of taking alectinib, the targeted lung lesions and intrahepatic metastases regressed significantly. To date, the patient has achieved nearly 1 year of progression-free survival while taking the drug. Given the diversity of ALK fusion genes and the different efficacy of ALK-TKIs, we believe that this case report has an important clinical reference.
1 Introduction
The anaplastic lymphoma kinase (ALK) gene is located on the short arm of chromosome 2 (2p23), and it is a member of the insulin receptor superfamily that encodes the ALK protein. ALK gene rearrangement is a driver mutation underlying the development of non-small-cell lung cancer (NSCLC) that has been identified in 5–6% of cases [1]. ALK rearrangements are more prevalent in Asian populations of female nonsmokers [2]. Although the incidence of ALK rearrangement is low, 60% of patients respond well to ALK-tyrosine kinase inhibitors (TKIs). The most common ALK fusion partner in NSCLC is EMAP-like 4 (EML4)-ALK (88.9%). ALK fusion with some rare genes has also been reported [3,4]. Although ALK fusion genes have a high response rate to ALK-TKIs in patients with NSCLC, some patients with rare ALK fusions have been reported to be non-responders to ALK-TKIs [5]. Zhu and He .[6] reported a case of a nonsmoking male with lung adenocarcinoma who was found to be SLC8A1-ALK fusion gene positive and developed resistance to treatment with crizotinib for 9 months. Given the differences in patient response to targeted ALK inhibitors for the treatment of lung adenocarcinoma, the genomic heterogeneity of ALK rearrangements has received considerable attention in recent years. So, the exploration of novel forms of ALK fusion and their association with tumor sensitivity to drugs remains essential. Here, we described a patient with advanced lung adenocarcinoma with a rare ALK gene fusion, SLC8A1-ALK, which was sensitive to alectinib.
2 Case report
A 41-year-old Chinese female nonsmoker presented to our hospital with hoarseness that had persisted for 2 months. The chest computed tomography (CT) scan showed a 5.3 cm × 5.1 cm mass in the left upper lobe with metastases to the left pulmonary artery, bilateral intrapulmonary, mediastinal, and bilateral cervical lymph nodes, liver, and multiple bones. The patient underwent fibreoptic bronchoscopy and received a pathological diagnosis of stage IVB adenocarcinoma. The immunohistochemical analysis revealed positive expression for CK7, thyroid transcription factor 1 (TTF-1), and negative expression of P63, CK(5/6), indicating an adenocarcinoma origin of the lung tumor. Besides, there was a positive staining for ALK-V and a negative staining for ROS-1 expression (Figure 1). The patient’s tumor tissues were subjected to next-generation sequencing at the DNA level based on 61 genetic panels on biopsy specimens (Nova-Seq 6000, Illumina Corporation), which revealed a rare ALK rearrangement, SLC8A1-ALK (allele frequency = 10.39%) (Figure 2a and b). Treatment with alectinib (600 mg twice daily) was initiated in February 2021. After 2 months of this therapy, CT scans were repeated, and the images showed that the lesions had obviously decreased in size to 1.9 cm × 1.7 cm (Figure 3). The tumor invasion of the left pulmonary artery and the intrahepatic metastatic lesions were also reduced. The patient was considered to have achieved partial remission (PR) according to the Response Evaluation Criteria in Solid Tumours 1.1. Patient maintains PR efficacy for 1 year after taking the drug. To date, the patient continues to take alectinib and no serious adverse effects have been observed.

Histological findings (40× magnification). (a) Hematoxylin and eosin-stained biopsy specimen reveals adenocarcinoma; (b) immunohistochemical analysis showing ALK-positive staining; (c) keratin 7 (CK7)-positive staining; and (d) thyroid transcription factor-1 (TTF-1)-positive staining. Scale bars represent 50 μm.

(a) Sequencing reads of ALK and SLC8A1 are shown by the Integrative Genomics Viewer. SLC8A1 and ALK both located on chromosome 2, the two genes translocation leading to a new fusion oncogene SLC8A1-ALK. (b) Schematic structure of the genomic DNA sequence shows fusion points for the SLC8A1-ALK fusion gene. Exon 2 of the SLC8A1 gene rearranged with exon 20 of the ALK gene.

Lung adenocarcinoma shown by radiologic. Dynamic imaging of CT scan of patients treated with alectinib showing target lesions, mass invasion of the left pulmonary artery and response of liver metastases at baseline, 2 and 4 months of treatment.
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Informed consent: Informed consent has been obtained from all individuals included in this study.
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Ethical approval: The research related to human use has been complied with all the relevant national regulations and institutional policies and in accordance with the tenets of the Declaration of Helsinki and has been approved by the Ethics Committee of West China Hospital.
3 Discussion
Approximately 30 different ALK fusion protein partners have been described, and SLC8A1 is a rare partner for ALK. So far, Zhu and He. [6] reported a case of a nonsmoking male with lung adenocarcinoma who was found to be SLC8A1-ALK fusion gene positive by second-generation gene sequencing. This patient was selected for crizotinib as a first-line treatment option and achieved a progression-free survival (PFS) of 9 months. Following the development of resistance to crizotinib, treatment with alectinib was initiated. It can be boldly speculated that not only does the ALK fusion pattern affect the response to ALK-TKI treatment, but the same ALK fusion pattern may respond very differently to different types of ALK-TKI therapy. Of course, this requires more clinical data to discover and summarize the patterns.
Both alectinib and crizotinib were recommended as category 1 agents for first-line therapy in patients with ALK-positive NSCLC in the National Comprehensive Cancer Network (NCCN) guidelines, version 5. 2018 (7), but alectinib is preferred [7]. Alectinib is a highly selective ALK inhibitor that inhibits the activation of ALK fusion proteins and thus acts as an anti-tumor agent. The treatment with alectinib showed a survival benefit in terms of both the median PFS rate and safety compared with crizotinib in three randomized phase III studies [8]. It has also been previously reported in the literature that crizotinib is highly effective for treating typical or atypical ALK gene fusion positive for advanced NSCLC; however, few cases of observed efficacy with aletinib have been reported. We administered aletinib to the patient and so far have achieved 1 year of sustained remission. Compared with the report by Zhu and He., this suggests that PFS with first-line treatment with aletinib may be superior to crizotinib in patients with SLC8A1-ALK fusion lung adenocarcinoma.
The most common form of mutation in the ALK gene is gene translocation with another partner gene, which results in a fusion oncogene. ALK rearrangement produces ALK tyrosine kinase, which activates downstream signaling pathways and the underexpression of the SLC8A1 gene, which leads to the dysregulation of calcium-dependent signaling pathways that promote cell proliferation and migration and inhibit cell death [8,9]. In the current case, exon 2 of the SLC8A1 gene rearranged with exon 20 of the ALK gene to form a new fusion gene, SLC8A1-ALK. Novel ALK fusion proteins promote cell proliferation by activating the RAS-MAPK and JAK-STAT downstream signaling pathways through dimerization [10]. Based on the results of available studies, the SLC8A1-ALK fusion is considered to be tumorigenic. Our patient with this newly identified SLC8A1-ALK fusion benefited from alectinib treatment. We summarized the clinical characteristics of patients with NSCLC harboring rare ALK fusions in Table 1.
The clinical characteristics of patients with NSCLC harboring rare ALK fusions
Article | Age/gender | Smoking status | Histologic type | ALK fusion gene | Rebiopsy specimen | Technique | ALK-TKIs | Response |
---|---|---|---|---|---|---|---|---|
Hao Lin, et al., 2018 | 56/M | Never | AC | EML6-ALK, FBXO11-ALK | Lung | NGS | Crizotinib | PR |
Carlos Pagan, et al., 2018 | 73/M | Former | AC | SLMAP-ALK | Lung | NGS | Crizotinib | PR |
Jing Luo, et al., 2019 | 44/M | Former | AC | EML4-ALK, PRKCB-ALK | Lung | NGS | Crizotinib | PR |
Tingting Feng, et al., 2019 | 49/F | Never | AC | TNIP2-ALK | Lung | NGS | Crizotinib | PR |
Bao-Dong Qin, et al., 2019 | 29/M | Former | AC | EML4-ALK, BCL11A-ALK | Bronchial | NGS | Crizotinib | PR |
Chunhua Zhou, et al., 2019 | 43/M | Former | AC | STRN-ALK | Liver | NGS | Gefitinib, crizotinib | PR |
Jiang-Ming Zhong, et al., 2020 | 60/M | Unknown | AC | EML4-ALK, BIRC6-ALK | Lung | NGS | Alectinib | PR |
Hua-fei Chen, et al., 2020 | 52/M | Unknown | AC | SOS1-ALK | Lung | NGS | Crizotinib | PR |
Xingyu Zhu and He, 2021 | 62/M | Never | AC | SLC8A1-ALK | Lung | NGS | Crizotinib, alectinib | PR |
Hao Zeng, et al., 2021 | 70/M | Never | AC | KIF5B-ALK | Lung | NGS | Crizotinib, alectinib | PR |
Present patient | 41/F | Never | AC | SLC8A1-ALK | Lung | NGS | Alectinib | PR |
AC = adenocarcinoma; F = female; M = male; ALK-TKIs = ALK-tyrosine kinase inhibitors; NGS = next-generation sequencing; PR = partial response.
4 Conclusion
The significance of this case report is to report not only a novel SLC8A1-ALK fusion in a lung adenocarcinoma patient but also the follow-up of this patient’s treatment with aletinib. It can provide a useful reference for the treatment of patients with ALK driver-positive lung adenocarcinoma.
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Funding information: This work was supported by the National Science Foundation of China (82072598, 81870034, 82070019, 91859203, 81871890), the Science and Technology Program of Sichuan, China (2020YFS0572, 2020ZYD009), and Central Guide Place-Free Exploration Project, Sichuan Provincial Department of Science and Technology (2020ZYD005).
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Conflict of interest: Authors state no conflict of interest.
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Data availability statement: The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
References
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© 2022 Ling Deng et al., published by De Gruyter
This work is licensed under the Creative Commons Attribution 4.0 International License.
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- Relationship between blood clots and COVID-19 vaccines: A literature review
- Analysis of genetic characteristics of 436 children with dysplasia and detailed analysis of rare karyotype
- Bioinformatics network analyses of growth differentiation factor 11
- NR4A1 inhibits the epithelial–mesenchymal transition of hepatic stellate cells: Involvement of TGF-β–Smad2/3/4–ZEB signaling
- Expression of Zeb1 in the differentiation of mouse embryonic stem cell
- Study on the genetic damage caused by cadmium sulfide quantum dots in human lymphocytes
- Association between single-nucleotide polymorphisms of NKX2.5 and congenital heart disease in Chinese population: A meta-analysis
- Assessment of the anesthetic effect of modified pentothal sodium solution on Sprague-Dawley rats
- Genetic susceptibility to high myopia in Han Chinese population
- Potential biomarkers and molecular mechanisms in preeclampsia progression
- Silencing circular RNA-friend leukemia virus integration 1 restrained malignancy of CC cells and oxaliplatin resistance by disturbing dyskeratosis congenita 1
- Endostar plus pembrolizumab combined with a platinum-based dual chemotherapy regime for advanced pulmonary large-cell neuroendocrine carcinoma as a first-line treatment: A case report
- The significance of PAK4 in signaling and clinicopathology: A review
- Sorafenib inhibits ovarian cancer cell proliferation and mobility and induces radiosensitivity by targeting the tumor cell epithelial–mesenchymal transition
- Characterization of rabbit polyclonal antibody against camel recombinant nanobodies
- Active legumain promotes invasion and migration of neuroblastoma by regulating epithelial-mesenchymal transition
- Effect of cell receptors in the pathogenesis of osteoarthritis: Current insights
- MT-12 inhibits the proliferation of bladder cells in vitro and in vivo by enhancing autophagy through mitochondrial dysfunction
- Study of hsa_circRNA_000121 and hsa_circRNA_004183 in papillary thyroid microcarcinoma
- BuyangHuanwu Decoction attenuates cerebral vasospasm caused by subarachnoid hemorrhage in rats via PI3K/AKT/eNOS axis
- Effects of the interaction of Notch and TLR4 pathways on inflammation and heart function in septic heart
- Monosodium iodoacetate-induced subchondral bone microstructure and inflammatory changes in an animal model of osteoarthritis
- A rare presentation of type II Abernethy malformation and nephrotic syndrome: Case report and review
- Rapid death due to pulmonary epithelioid haemangioendothelioma in several weeks: A case report
- Hepatoprotective role of peroxisome proliferator-activated receptor-α in non-cancerous hepatic tissues following transcatheter arterial embolization
- Correlation between peripheral blood lymphocyte subpopulations and primary systemic lupus erythematosus
- A novel SLC8A1-ALK fusion in lung adenocarcinoma confers sensitivity to alectinib: A case report
- β-Hydroxybutyrate upregulates FGF21 expression through inhibition of histone deacetylases in hepatocytes
- Identification of metabolic genes for the prediction of prognosis and tumor microenvironment infiltration in early-stage non-small cell lung cancer
- BTBD10 inhibits glioma tumorigenesis by downregulating cyclin D1 and p-Akt
- Mucormycosis co-infection in COVID-19 patients: An update
- Metagenomic next-generation sequencing in diagnosing Pneumocystis jirovecii pneumonia: A case report
- Long non-coding RNA HOXB-AS1 is a prognostic marker and promotes hepatocellular carcinoma cells’ proliferation and invasion
- Preparation and evaluation of LA-PEG-SPION, a targeted MRI contrast agent for liver cancer
- Proteomic analysis of the liver regulating lipid metabolism in Chaohu ducks using two-dimensional electrophoresis
- Nasopharyngeal tuberculosis: A case report
- Characterization and evaluation of anti-Salmonella enteritidis activity of indigenous probiotic lactobacilli in mice
- Aberrant pulmonary immune response of obese mice to periodontal infection
- Bacteriospermia – A formidable player in male subfertility
- In silico and in vivo analysis of TIPE1 expression in diffuse large B cell lymphoma
- Effects of KCa channels on biological behavior of trophoblasts
- Interleukin-17A influences the vulnerability rather than the size of established atherosclerotic plaques in apolipoprotein E-deficient mice
- Multiple organ failure and death caused by Staphylococcus aureus hip infection: A case report
- Prognostic signature related to the immune environment of oral squamous cell carcinoma
- Primary and metastatic squamous cell carcinoma of the thyroid gland: Two case reports
- Neuroprotective effects of crocin and crocin-loaded niosomes against the paraquat-induced oxidative brain damage in rats
- Role of MMP-2 and CD147 in kidney fibrosis
- Geometric basis of action potential of skeletal muscle cells and neurons
- Babesia microti-induced fulminant sepsis in an immunocompromised host: A case report and the case-specific literature review
- Role of cerebellar cortex in associative learning and memory in guinea pigs
- Application of metagenomic next-generation sequencing technique for diagnosing a specific case of necrotizing meningoencephalitis caused by human herpesvirus 2
- Case report: Quadruple primary malignant neoplasms including esophageal, ureteral, and lung in an elderly male
- Long non-coding RNA NEAT1 promotes angiogenesis in hepatoma carcinoma via the miR-125a-5p/VEGF pathway
- Osteogenic differentiation of periodontal membrane stem cells in inflammatory environments
- Knockdown of SHMT2 enhances the sensitivity of gastric cancer cells to radiotherapy through the Wnt/β-catenin pathway
- Continuous renal replacement therapy combined with double filtration plasmapheresis in the treatment of severe lupus complicated by serious bacterial infections in children: A case report
- Simultaneous triple primary malignancies, including bladder cancer, lymphoma, and lung cancer, in an elderly male: A case report
- Preclinical immunogenicity assessment of a cell-based inactivated whole-virion H5N1 influenza vaccine
- One case of iodine-125 therapy – A new minimally invasive treatment of intrahepatic cholangiocarcinoma
- S1P promotes corneal trigeminal neuron differentiation and corneal nerve repair via upregulating nerve growth factor expression in a mouse model
- Early cancer detection by a targeted methylation assay of circulating tumor DNA in plasma
- Calcifying nanoparticles initiate the calcification process of mesenchymal stem cells in vitro through the activation of the TGF-β1/Smad signaling pathway and promote the decay of echinococcosis
- Evaluation of prognostic markers in patients infected with SARS-CoV-2
- N6-Methyladenosine-related alternative splicing events play a role in bladder cancer
- Characterization of the structural, oxidative, and immunological features of testis tissue from Zucker diabetic fatty rats
- Effects of glucose and osmotic pressure on the proliferation and cell cycle of human chorionic trophoblast cells
- Investigation of genotype diversity of 7,804 norovirus sequences in humans and animals of China
- Characteristics and karyotype analysis of a patient with turner syndrome complicated with multiple-site tumors: A case report
- Aggravated renal fibrosis is positively associated with the activation of HMGB1-TLR2/4 signaling in STZ-induced diabetic mice
- Distribution characteristics of SARS-CoV-2 IgM/IgG in false-positive results detected by chemiluminescent immunoassay
- SRPX2 attenuated oxygen–glucose deprivation and reperfusion-induced injury in cardiomyocytes via alleviating endoplasmic reticulum stress-induced apoptosis through targeting PI3K/Akt/mTOR axis
- Aquaporin-8 overexpression is involved in vascular structure and function changes in placentas of gestational diabetes mellitus patients
- Relationship between CRP gene polymorphisms and ischemic stroke risk: A systematic review and meta-analysis
- Effects of growth hormone on lipid metabolism and sexual development in pubertal obese male rats
- Cloning and identification of the CTLA-4IgV gene and functional application of vaccine in Xinjiang sheep
- Antitumor activity of RUNX3: Upregulation of E-cadherin and downregulation of the epithelial–mesenchymal transition in clear-cell renal cell carcinoma
- PHF8 promotes osteogenic differentiation of BMSCs in old rat with osteoporosis by regulating Wnt/β-catenin pathway
- A review of the current state of the computer-aided diagnosis (CAD) systems for breast cancer diagnosis
- Bilateral dacryoadenitis in adult-onset Still’s disease: A case report
- A novel association between Bmi-1 protein expression and the SUVmax obtained by 18F-FDG PET/CT in patients with gastric adenocarcinoma
- The role of erythrocytes and erythroid progenitor cells in tumors
- Relationship between platelet activation markers and spontaneous abortion: A meta-analysis
- Abnormal methylation caused by folic acid deficiency in neural tube defects
- Silencing TLR4 using an ultrasound-targeted microbubble destruction-based shRNA system reduces ischemia-induced seizures in hyperglycemic rats
- Plant Sciences
- Seasonal succession of bacterial communities in cultured Caulerpa lentillifera detected by high-throughput sequencing
- Cloning and prokaryotic expression of WRKY48 from Caragana intermedia
- Novel Brassica hybrids with different resistance to Leptosphaeria maculans reveal unbalanced rDNA signal patterns
- Application of exogenous auxin and gibberellin regulates the bolting of lettuce (Lactuca sativa L.)
- Phytoremediation of pollutants from wastewater: A concise review
- Genome-wide identification and characterization of NBS-encoding genes in the sweet potato wild ancestor Ipomoea trifida (H.B.K.)
- Alleviative effects of magnetic Fe3O4 nanoparticles on the physiological toxicity of 3-nitrophenol to rice (Oryza sativa L.) seedlings
- Selection and functional identification of Dof genes expressed in response to nitrogen in Populus simonii × Populus nigra
- Study on pecan seed germination influenced by seed endocarp
- Identification of active compounds in Ophiopogonis Radix from different geographical origins by UPLC-Q/TOF-MS combined with GC-MS approaches
- The entire chloroplast genome sequence of Asparagus cochinchinensis and genetic comparison to Asparagus species
- Genome-wide identification of MAPK family genes and their response to abiotic stresses in tea plant (Camellia sinensis)
- Selection and validation of reference genes for RT-qPCR analysis of different organs at various development stages in Caragana intermedia
- Cloning and expression analysis of SERK1 gene in Diospyros lotus
- Integrated metabolomic and transcriptomic profiling revealed coping mechanisms of the edible and medicinal homologous plant Plantago asiatica L. cadmium resistance
- A missense variant in NCF1 is associated with susceptibility to unexplained recurrent spontaneous abortion
- Assessment of drought tolerance indices in faba bean genotypes under different irrigation regimes
- The entire chloroplast genome sequence of Asparagus setaceus (Kunth) Jessop: Genome structure, gene composition, and phylogenetic analysis in Asparagaceae
- Food Science
- Dietary food additive monosodium glutamate with or without high-lipid diet induces spleen anomaly: A mechanistic approach on rat model
- Binge eating disorder during COVID-19
- Potential of honey against the onset of autoimmune diabetes and its associated nephropathy, pancreatitis, and retinopathy in type 1 diabetic animal model
- FTO gene expression in diet-induced obesity is downregulated by Solanum fruit supplementation
- Physical activity enhances fecal lactobacilli in rats chronically drinking sweetened cola beverage
- Supercritical CO2 extraction, chemical composition, and antioxidant effects of Coreopsis tinctoria Nutt. oleoresin
- Functional constituents of plant-based foods boost immunity against acute and chronic disorders
- Effect of selenium and methods of protein extraction on the proteomic profile of Saccharomyces yeast
- Microbial diversity of milk ghee in southern Gansu and its effect on the formation of ghee flavor compounds
- Ecology and Environmental Sciences
- Effects of heavy metals on bacterial community surrounding Bijiashan mining area located in northwest China
- Microorganism community composition analysis coupling with 15N tracer experiments reveals the nitrification rate and N2O emissions in low pH soils in Southern China
- Genetic diversity and population structure of Cinnamomum balansae Lecomte inferred by microsatellites
- Preliminary screening of microplastic contamination in different marine fish species of Taif market, Saudi Arabia
- Plant volatile organic compounds attractive to Lygus pratensis
- Effects of organic materials on soil bacterial community structure in long-term continuous cropping of tomato in greenhouse
- Effects of soil treated fungicide fluopimomide on tomato (Solanum lycopersicum L.) disease control and plant growth
- Prevalence of Yersinia pestis among rodents captured in a semi-arid tropical ecosystem of south-western Zimbabwe
- Effects of irrigation and nitrogen fertilization on mitigating salt-induced Na+ toxicity and sustaining sea rice growth
- Bioengineering and Biotechnology
- Poly-l-lysine-caused cell adhesion induces pyroptosis in THP-1 monocytes
- Development of alkaline phosphatase-scFv and its use for one-step enzyme-linked immunosorbent assay for His-tagged protein detection
- Development and validation of a predictive model for immune-related genes in patients with tongue squamous cell carcinoma
- Agriculture
- Effects of chemical-based fertilizer replacement with biochar-based fertilizer on albic soil nutrient content and maize yield
- Genome-wide identification and expression analysis of CPP-like gene family in Triticum aestivum L. under different hormone and stress conditions
- Agronomic and economic performance of mung bean (Vigna radiata L.) varieties in response to rates of blended NPS fertilizer in Kindo Koysha district, Southern Ethiopia
- Influence of furrow irrigation regime on the yield and water consumption indicators of winter wheat based on a multi-level fuzzy comprehensive evaluation
- Discovery of exercise-related genes and pathway analysis based on comparative genomes of Mongolian originated Abaga and Wushen horse
- Lessons from integrated seasonal forecast-crop modelling in Africa: A systematic review
- Evolution trend of soil fertility in tobacco-planting area of Chenzhou, Hunan Province, China
- Animal Sciences
- Morphological and molecular characterization of Tatera indica Hardwicke 1807 (Rodentia: Muridae) from Pothwar, Pakistan
- Research on meat quality of Qianhua Mutton Merino sheep and Small-tail Han sheep
- SI: A Scientific Memoir
- Suggestions on leading an academic research laboratory group
- My scientific genealogy and the Toronto ACDC Laboratory, 1988–2022
- Erratum
- Erratum to “Changes of immune cells in patients with hepatocellular carcinoma treated by radiofrequency ablation and hepatectomy, a pilot study”
- Erratum to “A two-microRNA signature predicts the progression of male thyroid cancer”
- Retraction
- Retraction of “Lidocaine has antitumor effect on hepatocellular carcinoma via the circ_DYNC1H1/miR-520a-3p/USP14 axis”