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Efavirenz use can negatively influence vitamin D levels and supplementation is necessary as a likely adjunct to improving CD4+ T cells, resulting in greater effectiveness of the treatment. A weekly oral dose of 50,000 IU of vitamin D was sufficient to normalize the vitamin deficiency, safely and with good adherence among persons living with HIV/AIDS in Brazil. Icotinib has provided survival benefits for patients with advanced, epidermal growth factor receptor (EGFR)-mutant non-small-cell lung cancer (NSCLC). We aimed to compare icotinib with chemoth