Abstract
Collision breast tumors, consisting of breast cancer (BC) and non-Hodgkin’s lymphoma (NHL), are extremely rare. Here we report the case of a 64-year-old woman with a collision tumor in her left breast mass that was composed of invasive ductal carcinoma and small lymphocytic lymphoma/chronic lymphocytic leukemia. In addition, we reviewed the published comparable English-language literature. Collision breast tumor composed of BC and NHL is extremely rare. For that reason, there is a lack of consensus about the underlying mechanism, and diagnosing it without delay remains a complex clinical challenge. We found that post-menopausal, age-related estrogen levels changes and Epstein-Barr virus infection are possible pathogenic factors. However, the symptoms are almost identical, and it is difficult to distinguish a simple breast tumor from a breast collision tumor. In this study, we reviewed the clinical features of all patients with BC and NHL colliding breast tumors; this information might enable early identification and prevention of misdiagnosis.
1 Introduction
Synchronous breast cancer (BC) and non-Hodgkin’s lymphoma (NHL) is rare, and only 38 cases have been reported in the literature [1]. BC and NHL presenting in the same breast as a collision tumor is extremely rare. Collision tumor is the concrescence of two histologically distinct tumor subtypes occurring in the same site. Herein we report the case of a 64-year-old woman presenting with a collision tumor composed of invasive ductal carcinoma (IDC) and small lymphocytic lymphoma/chronic lymphocytic leukemia (SLL/CLL) in her left breast mass. To the best of our knowledge, only four such cases have been reported thus far [2–5].
2 Case report
A 64-year-old menopausal woman went to see a doctor to find a mass, which was nearly 2 cm in diameter and could be felt in the upper outer quadrant of the left breast. It is shown in mammary gland molybdenum target as a mass-shape high-density shadow (Figure 1) and shown in ultrasound as a low echo with a size of 2.4 cm × 1.5 cm (Figure 2) at 1–2 o’clock directions of the left breast. No abnormality was found in the right breast. There is a swollen lymph node at the left axillary, which is about 2.8 cm × 1.6 cm. Blood flow signals are visible in both masses. The fine needle aspiration (FNA) inspection on axillary lymph nodes (ALN) did not prompt malignant.

The mass is shown in mammary gland molybdenum target as a mass-shape high-density shadow.

The left breast mass is shown in ultrasound as a low echo with a size of 2.4 cm × 1.5 cm.
The left breast mass histopathologic examination revealed collision tumors composed of IDC and SLL/CLL. IDC and diffuse proliferation of atypical lymphoid cells were visible (Figure 3), the morphology of lymphocyte with the characteristics of a single form, small to medium size, small round cells, less cytoplasm, smaller nuclear chromatin, less obvious nucleolus and visible mitotic count. Immunohistochemical staining shows IDC was ER, PR and Her-2 negative, while the atypical lymphoid cells were positive for CD20 (Figure 4) and CD23, but negative for CD3, CD5 and CyclinD1. Left ALNs and bone marrow were consistent with SLL/CLL, without BC metastasis. Microscopically atypical lymphoid cells with diffused hyperplasia was shown, and no cancer cell has been seen. The immunohistochemical staining is similar to that of atypical lymphoid cells in the left breast mass.

The left breast mass, IDC and diffuse proliferation of atypical lymphoid cells (HE, ×20).

The left breast mass; lymphoid cells were CD20 positive (IHC, ×20).
After a multidisciplinary discussion, we suggested chemotherapy, but she refused and took traditional Chinese medicine as a treatment instead. In 20 months, no evidence could indicate the disease progression.
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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, institutional policies and in accordance with the tenets of the Helsinki Declaration, and has been approved by the authors’ institutional review board or equivalent committee.
3 Discussion
NHL as a second primary tumor occasionally occurs secondarily in BC patients receiving radiotherapy and chemotherapy. Synchronous BC and NHL are rare, and only 39 cases have been reported thus far in the English literature. BC and NHL are commonly found in different organs or lymph nodes and rarely occur in the same organ [1]. Collision tumor refers to the tumor formed by two primary tumors infiltrating each other, i.e., when two separate tumors occur in the same site. Carcinosarcoma is a rare form of collision mammary cancer with mixed epithelial and sarcomatoid components, accounting for <0.1% of all breast malignancies [6]. We report a case of colliding breast neoplasm consisting of BC and NHL that is much rarer than carcinosarcoma. To the best of our knowledge, only four such cases have been reported in the English literature [2–5]. Owing to the rarity of the disease, there is no consensus on its etiological mechanism and clinical characteristics, and early diagnosis remains a challenge for clinicians. We have presented a review of all these cases in Table 1.
Collision breast tumors composed of BC and NHL
| BC | NHL | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Case | Gender | Age | Site | Type | Grade | ER/PR/Her-2 | Metastasis | Site | Type | Metastasis |
| 2004 | Female | 79 | LB | IDC | NS | NS | LAN | LB | MALT | LAN and BM |
| 2006 | Female | 53 | LB | IDC | PD | NS | NS | LB | MALT | LSN |
| 2007 | Female | 55 | RB | IDC | WD | +/+/− | LSN | RB | SLL/CLL | RAN and BM |
| 2015 | Female | 71 | RB | IDC | WD | NS | NS | BB | SLL/CLL | RAN |
| Present case | Female | 64 | LB | IDC | PD | −/−/− | NS | LB | SLL/CLL | LAN and BM |
BC, breast cancer; NHL, non-Hodgkin lymphoma; LB, left breast; BB, bilateral breast; RB, right breast; +, positive stated; −, negative stated; NS, not stated; PD, poorly differentiated; WD, well differentiated; RAN, right axillary node; LAN, left axillary node; BM, bone marrow; LSN, left sentinel node; MALT, mucosa-associated lymphoid tissue; SLL/CLL, small lymphocytic lymphoma/chronic lymphocytic leukemia.
The mechanisms that cause such collisions are very complex, and the pathophysiological association between the two concurrent tumors may be attributable to the fact that they are induced by the same causal factor. We noted that the average age of all 5 female patients was 64 years, and all of them were post-menopausal. NHL is more likely to occur in post-menopausal women [7], and estrogen increases the risk of BC [8,9]. Fats in the breast can increase estrogen biosynthesis, and the estrogen concentration in the breast remains relatively high despite the extremely low post-menopausal estrogen levels [10]. One possibility is that abnormally high estrogen levels in a post-menopausal woman’s breast can induce cancer and collision. It is important to explain that BC and NHL collision tumor occurs in the breast and not in other organs. Our study demonstrates the potential epidemiological factors that play a role, including age-related estrogen levels.
The other leading hypothesis is that certain viruses are simultaneously pathogenic in two different types of primary tumors, causing the collision. Long-term infection by the human papillomavirus causes colliding tumors in various organs, including the tongue [11] and the thyroid gland [12] as well as the vulva [13]. However, the Epstein-Barr virus (EBV) has been neglected for a long time. Our study suggests that EBV plays an important role in the collision between BC and NHL in the mammary glands. EBV infection promotes the occurrence of BC [14] and NHL [15] and particularly increases the risk of CLL occurrence [16]. It has been reported that there is a higher chance of detecting an EBV sequence in the IDC tissue than in a normal breast tissue [17]. The combination of IDC and SLL/CLL was more common in all the cases that we reviewed. This evidence suggests that EBV infection is an important inducer of BC and NHL colliding tumors.
The preoperative identification of the two tumor components in breast tumors is necessary because the treatment of BC and NHL is completely different. However, owing to similar clinical symptoms, colliding breast tumor is more likely to be mistaken for simple BC. In all the cases that we reviewed, it was often difficult to make a preoperative diagnosis using non-invasive imaging or with minimally invasive FNA. Yin et al. found that positron emission tomography (PET)/computed tomography may be more sensitive for identifying two different components in colliding tumors because of their uptake rate differences, demonstrating a mass with an increased uneven 18F-FDG uptake [18]. For collision breast tumors of BC and NHL, the use of some specially formulated contrast agents may be helpful for differentiating. The potential of 68Ga-NOTA-F (ab′)2-rituximab and 68Ga-NOTA-F (ab′)-rituximab as PET imaging agents for NHL has been reported [19].
Our case review showed that it is challenging to diagnose BC/NHL colliding breast tumors even with the post-operative pathology. Among the 100 collision tumors, the most common non-hematological neoplasms associated with a hematolymphoid proliferative disorder (HLPD) were from the breast (15%), and the most commonly identified HLPD was CLL/SLL (18%) [20]. In this cohort, 5% of the low-grade HLPDs, all of the CLL/SLL, were missed at initial sign-out. It is important to consider the collision of low-grade HLPDs before assuming that the lymphoid infiltrates represent an immunological response.
4 Conclusion
The combination of BC and NHL in collision breast tumors is rare. The mechanisms that cause collision breast tumors are very complex, and we do not yet completely understand the key causative factors. Clinical diagnosis of such cases is a serious challenge, and very few cases have been reported so far; therefore, we need to continue reporting such cases to share more useful information. Herein we reviewed the clinical features of all such cases of breast collision tumors for early identification and prevention of misdiagnosis.
Acknowledgements
Thanks author Xiaowen Chen's wife Mrs. Wenyi for her help, and thanks Mr. Allen Ezail Iverson for his emotional support.
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Funding information: The authors state no funding involved.
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Author contributions: X.W.C. and Y.W.C.: study conception and design; J.L.C.: data acquisition, analysis and interpretation; X.W.C.: drafting of the manuscript; S.H.L. and Y.W.C.: critical revision. The authors applied the SDC approach for the sequence of authors.
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Conflict of interest: The authors state no conflict of interest.
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Data availability statement: Data sharing is not applicable to this article as no datasets were generated or analyzed during the current study.
Reference
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© 2021 Xiaowen Chen et al., published by De Gruyter
This work is licensed under the Creative Commons Attribution 4.0 International License.
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- Circ_0091579 enhances the malignancy of hepatocellular carcinoma via miR-1287/PDK2 axis
- Silencing XIST mitigated lipopolysaccharide (LPS)-induced inflammatory injury in human lung fibroblast WI-38 cells through modulating miR-30b-5p/CCL16 axis and TLR4/NF-κB signaling pathway
- Protocatechuic acid attenuates cerebral aneurysm formation and progression by inhibiting TNF-alpha/Nrf-2/NF-kB-mediated inflammatory mechanisms in experimental rats
- ABCB1 polymorphism in clopidogrel-treated Montenegrin patients
- Metabolic profiling of fatty acids in Tripterygium wilfordii multiglucoside- and triptolide-induced liver-injured rats
- miR-338-3p inhibits cell growth, invasion, and EMT process in neuroblastoma through targeting MMP-2
- Verification of neuroprotective effects of alpha-lipoic acid on chronic neuropathic pain in a chronic constriction injury rat model
- Circ_WWC3 overexpression decelerates the progression of osteosarcoma by regulating miR-421/PDE7B axis
- Knockdown of TUG1 rescues cardiomyocyte hypertrophy through targeting the miR-497/MEF2C axis
- MiR-146b-3p protects against AR42J cell injury in cerulein-induced acute pancreatitis model through targeting Anxa2
- miR-299-3p suppresses cell progression and induces apoptosis by downregulating PAX3 in gastric cancer
- Diabetes and COVID-19
- Discovery of novel potential KIT inhibitors for the treatment of gastrointestinal stromal tumor
- TEAD4 is a novel independent predictor of prognosis in LGG patients with IDH mutation
- circTLK1 facilitates the proliferation and metastasis of renal cell carcinoma by regulating miR-495-3p/CBL axis
- microRNA-9-5p protects liver sinusoidal endothelial cell against oxygen glucose deprivation/reperfusion injury
- Long noncoding RNA TUG1 regulates degradation of chondrocyte extracellular matrix via miR-320c/MMP-13 axis in osteoarthritis
- Duodenal adenocarcinoma with skin metastasis as initial manifestation: A case report
- Effects of Loofah cylindrica extract on learning and memory ability, brain tissue morphology, and immune function of aging mice
- Recombinant Bacteroides fragilis enterotoxin-1 (rBFT-1) promotes proliferation of colorectal cancer via CCL3-related molecular pathways
- Blocking circ_UBR4 suppressed proliferation, migration, and cell cycle progression of human vascular smooth muscle cells in atherosclerosis
- Gene therapy in PIDs, hemoglobin, ocular, neurodegenerative, and hemophilia B disorders
- Downregulation of circ_0037655 impedes glioma formation and metastasis via the regulation of miR-1229-3p/ITGB8 axis
- Vitamin D deficiency and cardiovascular risk in type 2 diabetes population
- Circ_0013359 facilitates the tumorigenicity of melanoma by regulating miR-136-5p/RAB9A axis
- Mechanisms of circular RNA circ_0066147 on pancreatic cancer progression
- lncRNA myocardial infarction-associated transcript (MIAT) knockdown alleviates LPS-induced chondrocytes inflammatory injury via regulating miR-488-3p/sex determining region Y-related HMG-box 11 (SOX11) axis
- Identification of circRNA circ-CSPP1 as a potent driver of colorectal cancer by directly targeting the miR-431/LASP1 axis
- Hyperhomocysteinemia exacerbates ischemia-reperfusion injury-induced acute kidney injury by mediating oxidative stress, DNA damage, JNK pathway, and apoptosis
- Potential prognostic markers and significant lncRNA–mRNA co-expression pairs in laryngeal squamous cell carcinoma
- Gamma irradiation-mediated inactivation of enveloped viruses with conservation of genome integrity: Potential application for SARS-CoV-2 inactivated vaccine development
- ADHFE1 is a correlative factor of patient survival in cancer
- The association of transcription factor Prox1 with the proliferation, migration, and invasion of lung cancer
- Is there a relationship between the prevalence of autoimmune thyroid disease and diabetic kidney disease?
- Immunoregulatory function of Dictyophora echinovolvata spore polysaccharides in immunocompromised mice induced by cyclophosphamide
- T cell epitopes of SARS-CoV-2 spike protein and conserved surface protein of Plasmodium malariae share sequence homology
- Anti-obesity effect and mechanism of mesenchymal stem cells influence on obese mice
- Long noncoding RNA HULC contributes to paclitaxel resistance in ovarian cancer via miR-137/ITGB8 axis
- Glucocorticoids protect HEI-OC1 cells from tunicamycin-induced cell damage via inhibiting endoplasmic reticulum stress
- Prognostic value of the neutrophil-to-lymphocyte ratio in acute organophosphorus pesticide poisoning
- Gastroprotective effects of diosgenin against HCl/ethanol-induced gastric mucosal injury through suppression of NF-κβ and myeloperoxidase activities
- Silencing of LINC00707 suppresses cell proliferation, migration, and invasion of osteosarcoma cells by modulating miR-338-3p/AHSA1 axis
- Successful extracorporeal membrane oxygenation resuscitation of patient with cardiogenic shock induced by phaeochromocytoma crisis mimicking hyperthyroidism: A case report
- Effects of miR-185-5p on replication of hepatitis C virus
- Lidocaine has antitumor effect on hepatocellular carcinoma via the circ_DYNC1H1/miR-520a-3p/USP14 axis
- Primary localized cutaneous nodular amyloidosis presenting as lymphatic malformation: A case report
- Multimodal magnetic resonance imaging analysis in the characteristics of Wilson’s disease: A case report and literature review
- Therapeutic potential of anticoagulant therapy in association with cytokine storm inhibition in severe cases of COVID-19: A case report
- Neoadjuvant immunotherapy combined with chemotherapy for locally advanced squamous cell lung carcinoma: A case report and literature review
- Rufinamide (RUF) suppresses inflammation and maintains the integrity of the blood–brain barrier during kainic acid-induced brain damage
- Inhibition of ADAM10 ameliorates doxorubicin-induced cardiac remodeling by suppressing N-cadherin cleavage
- Invasive ductal carcinoma and small lymphocytic lymphoma/chronic lymphocytic leukemia manifesting as a collision breast tumor: A case report and literature review
- Clonal diversity of the B cell receptor repertoire in patients with coronary in-stent restenosis and type 2 diabetes
- CTLA-4 promotes lymphoma progression through tumor stem cell enrichment and immunosuppression
- WDR74 promotes proliferation and metastasis in colorectal cancer cells through regulating the Wnt/β-catenin signaling pathway
- Down-regulation of IGHG1 enhances Protoporphyrin IX accumulation and inhibits hemin biosynthesis in colorectal cancer by suppressing the MEK-FECH axis
- Curcumin suppresses the progression of gastric cancer by regulating circ_0056618/miR-194-5p axis
- Scutellarin-induced A549 cell apoptosis depends on activation of the transforming growth factor-β1/smad2/ROS/caspase-3 pathway
- lncRNA NEAT1 regulates CYP1A2 and influences steroid-induced necrosis
- A two-microRNA signature predicts the progression of male thyroid cancer
- Isolation of microglia from retinas of chronic ocular hypertensive rats
- Changes of immune cells in patients with hepatocellular carcinoma treated by radiofrequency ablation and hepatectomy, a pilot study
- Calcineurin Aβ gene knockdown inhibits transient outward potassium current ion channel remodeling in hypertrophic ventricular myocyte
- Aberrant expression of PI3K/AKT signaling is involved in apoptosis resistance of hepatocellular carcinoma
- Clinical significance of activated Wnt/β-catenin signaling in apoptosis inhibition of oral cancer
- circ_CHFR regulates ox-LDL-mediated cell proliferation, apoptosis, and EndoMT by miR-15a-5p/EGFR axis in human brain microvessel endothelial cells
- Resveratrol pretreatment mitigates LPS-induced acute lung injury by regulating conventional dendritic cells’ maturation and function
- Ubiquitin-conjugating enzyme E2T promotes tumor stem cell characteristics and migration of cervical cancer cells by regulating the GRP78/FAK pathway
- Carriage of HLA-DRB1*11 and 1*12 alleles and risk factors in patients with breast cancer in Burkina Faso
- Protective effect of Lactobacillus-containing probiotics on intestinal mucosa of rats experiencing traumatic hemorrhagic shock
- Glucocorticoids induce osteonecrosis of the femoral head through the Hippo signaling pathway
- Endothelial cell-derived SSAO can increase MLC20 phosphorylation in VSMCs
- Downregulation of STOX1 is a novel prognostic biomarker for glioma patients
- miR-378a-3p regulates glioma cell chemosensitivity to cisplatin through IGF1R
- The molecular mechanisms underlying arecoline-induced cardiac fibrosis in rats
- TGF-β1-overexpressing mesenchymal stem cells reciprocally regulate Th17/Treg cells by regulating the expression of IFN-γ
- The influence of MTHFR genetic polymorphisms on methotrexate therapy in pediatric acute lymphoblastic leukemia
- Red blood cell distribution width-standard deviation but not red blood cell distribution width-coefficient of variation as a potential index for the diagnosis of iron-deficiency anemia in mid-pregnancy women
- Small cell neuroendocrine carcinoma expressing alpha fetoprotein in the endometrium
- Superoxide dismutase and the sigma1 receptor as key elements of the antioxidant system in human gastrointestinal tract cancers
- Molecular characterization and phylogenetic studies of Echinococcus granulosus and Taenia multiceps coenurus cysts in slaughtered sheep in Saudi Arabia
- ITGB5 mutation discovered in a Chinese family with blepharophimosis-ptosis-epicanthus inversus syndrome
- ACTB and GAPDH appear at multiple SDS-PAGE positions, thus not suitable as reference genes for determining protein loading in techniques like Western blotting
- Facilitation of mouse skin-derived precursor growth and yield by optimizing plating density
- 3,4-Dihydroxyphenylethanol ameliorates lipopolysaccharide-induced septic cardiac injury in a murine model
- Downregulation of PITX2 inhibits the proliferation and migration of liver cancer cells and induces cell apoptosis
- Expression of CDK9 in endometrial cancer tissues and its effect on the proliferation of HEC-1B
- Novel predictor of the occurrence of DKA in T1DM patients without infection: A combination of neutrophil/lymphocyte ratio and white blood cells
- Investigation of molecular regulation mechanism under the pathophysiology of subarachnoid hemorrhage
- miR-25-3p protects renal tubular epithelial cells from apoptosis induced by renal IRI by targeting DKK3
- Bioengineering and Biotechnology
- Green fabrication of Co and Co3O4 nanoparticles and their biomedical applications: A review
- Agriculture
- Effects of inorganic and organic selenium sources on the growth performance of broilers in China: A meta-analysis
- Crop-livestock integration practices, knowledge, and attitudes among smallholder farmers: Hedging against climate change-induced shocks in semi-arid Zimbabwe
- Food Science and Nutrition
- Effect of food processing on the antioxidant activity of flavones from Polygonatum odoratum (Mill.) Druce
- Vitamin D and iodine status was associated with the risk and complication of type 2 diabetes mellitus in China
- Diversity of microbiota in Slovak summer ewes’ cheese “Bryndza”
- Comparison between voltammetric detection methods for abalone-flavoring liquid
- Composition of low-molecular-weight glutenin subunits in common wheat (Triticum aestivum L.) and their effects on the rheological properties of dough
- Application of culture, PCR, and PacBio sequencing for determination of microbial composition of milk from subclinical mastitis dairy cows of smallholder farms
- Investigating microplastics and potentially toxic elements contamination in canned Tuna, Salmon, and Sardine fishes from Taif markets, KSA
- From bench to bar side: Evaluating the red wine storage lesion
- Establishment of an iodine model for prevention of iodine-excess-induced thyroid dysfunction in pregnant women
- Plant Sciences
- Characterization of GMPP from Dendrobium huoshanense yielding GDP-D-mannose
- Comparative analysis of the SPL gene family in five Rosaceae species: Fragaria vesca, Malus domestica, Prunus persica, Rubus occidentalis, and Pyrus pyrifolia
- Identification of leaf rust resistance genes Lr34 and Lr46 in common wheat (Triticum aestivum L. ssp. aestivum) lines of different origin using multiplex PCR
- Investigation of bioactivities of Taxus chinensis, Taxus cuspidata, and Taxus × media by gas chromatography-mass spectrometry
- Morphological structures and histochemistry of roots and shoots in Myricaria laxiflora (Tamaricaceae)
- Transcriptome analysis of resistance mechanism to potato wart disease
- In silico analysis of glycosyltransferase 2 family genes in duckweed (Spirodela polyrhiza) and its role in salt stress tolerance
- Comparative study on growth traits and ions regulation of zoysiagrasses under varied salinity treatments
- Role of MS1 homolog Ntms1 gene of tobacco infertility
- Biological characteristics and fungicide sensitivity of Pyricularia variabilis
- In silico/computational analysis of mevalonate pyrophosphate decarboxylase gene families in Campanulids
- Identification of novel drought-responsive miRNA regulatory network of drought stress response in common vetch (Vicia sativa)
- How photoautotrophy, photomixotrophy, and ventilation affect the stomata and fluorescence emission of pistachios rootstock?
- Apoplastic histochemical features of plant root walls that may facilitate ion uptake and retention
- Ecology and Environmental Sciences
- The impact of sewage sludge on the fungal communities in the rhizosphere and roots of barley and on barley yield
- Domestication of wild animals may provide a springboard for rapid variation of coronavirus
- Response of benthic invertebrate assemblages to seasonal and habitat condition in the Wewe River, Ashanti region (Ghana)
- Molecular record for the first authentication of Isaria cicadae from Vietnam
- Twig biomass allocation of Betula platyphylla in different habitats in Wudalianchi Volcano, northeast China
- Animal Sciences
- Supplementation of probiotics in water beneficial growth performance, carcass traits, immune function, and antioxidant capacity in broiler chickens
- Predators of the giant pine scale, Marchalina hellenica (Gennadius 1883; Hemiptera: Marchalinidae), out of its natural range in Turkey
- Honey in wound healing: An updated review
- NONMMUT140591.1 may serve as a ceRNA to regulate Gata5 in UT-B knockout-induced cardiac conduction block
- Radiotherapy for the treatment of pulmonary hydatidosis in sheep
- Retraction
- Retraction of “Long non-coding RNA TUG1 knockdown hinders the tumorigenesis of multiple myeloma by regulating microRNA-34a-5p/NOTCH1 signaling pathway”
- Special Issue on Reuse of Agro-Industrial By-Products
- An effect of positional isomerism of benzoic acid derivatives on antibacterial activity against Escherichia coli
- Special Issue on Computing and Artificial Techniques for Life Science Applications - Part II
- Relationship of Gensini score with retinal vessel diameter and arteriovenous ratio in senile CHD
- Effects of different enantiomers of amlodipine on lipid profiles and vasomotor factors in atherosclerotic rabbits
- Establishment of the New Zealand white rabbit animal model of fatty keratopathy associated with corneal neovascularization
- lncRNA MALAT1/miR-143 axis is a potential biomarker for in-stent restenosis and is involved in the multiplication of vascular smooth muscle cells