Oral and Maxillofacial Pathology/Biology - Scholarly Publications

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Browsing Oral and Maxillofacial Pathology/Biology - Scholarly Publications by Author "Akinshipo, AO"

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    Open Access
    Ameloblastoma: current etiopathological concepts and management
    (John Wiley & Sons Ltd, 2017) Effiom, OA; Ogundana, OM; Akinshipo, AO; Akintoye, SO
    Ameloblastoma is a benign odontogenic tumor of epithelial origin. It is locally aggressive with unlimited growth capacity and has a high potential for malignant transformation as well as metastasis. Ameloblastoma has no established preventive measures although majority of patients are between ages 30 and 60 years. Molecular and genetic factors that promote oncogenic transformation of odontogenic epithelium to ameloblastoma are strongly linked to dysregulation of multiple genes associated with mitogen-activated protein kinase, sonic hedgehog, and WNT/b-catenin signaling pathways. Treatment of ameloblastoma is focused on surgicalr esection with a wide margin of normal tissue because of its high propensity for locoregional invasion; but this is often associated with significant patient morbidity. The relatively high recurrence rate of ameloblastoma is influenced by the type of molecular etiological factors, the management approach, and how early the patient presents for treatment. It is expected that further elucidation of molecular factors that orchestrate pathogenesis and recurrence of ameloblastoma will lead to new diagnostic markers and targeted drug therapies for ameloblastoma.
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    Open Access
    Salivary Adenoid Cystic Carcinoma: Clinicohistologic Study in a Nigerian Tertiary Institution
    (Wolters Kluwer - Medknow, 2019) Ajayi, OF; Ogundana, OM; Akinshipo, AO; Olawuyi, AB; Odukoya, O
    Background: Adenoid cystic carcinoma (ADCC) is a slow‑growing salivary gland tumor with high recurrence and mortality rates. Histologic variants present variable aggression. This has not been investigated in Nigeria. This study aimed to investigate association of histologic variants with clinical aggression in Nigerian cases. Patients and Methods: Fifty‑nine ADCC from 363 salivary gland tumors were selected from the departmental oral biopsy archives. Clinical data were retrieved, and hematoxylin and eosin sections were reviewed for confirmation and categorization into solid, cribriform, and tubular (modified Perzin, Spiro and van Weert systems). Estimated mean tumor growth rates (EMTGRs) were computed and matched with histologic variants. Statistical analysis was Chi‑square, Kruskal–Wallis, and Mann–Whitney’s test. P value was ≤0.05. Statistical package was SPSS. Results: Age ranged between 7 and 83 years (mean 49.2 ± 16.8 years). About 75.1% occurred in the 4th–6th decade (P = 0.02). Most common histologic variant was predominantly cribriform no solid (PCNS) pattern (40.7%). In major salivary glands, there was association between histologic variant and EMTGR (P = 0.025). PCNS had the highest EMTGR (0.840) followed by predominantly solid (PS) (EMTGR, 0.744). These were significantly higher than predominantly tubular no solid (PTNS) (EMTGR, 0.442) and predominantly tubular 30% solid (EMTGR, 0.115). In minor glands, there was also association between histologic variants and EMTGR (P = 0.017). However, the highest EMTGR (0.509) occurred in PTNS followed by PCNS (0.428). These were significantly higher than PS (0.259) with the least EMTGR. Conclusion: Trend of clinical aggression of histological variants based on EMTGR of ADCC varies depending on the type of salivary gland (major vs. minor).