“Promising Antineoplastic Effects of GFH009, a Potent and Selective CDK9 Inhibitor, in Hematologic Malignancies: Support from Ongoing Clinical Studies”

“Factors associated with severe dengue in hospitalized pediatric patients: a cross-sectional study in Rio de Janeiro, Brazil” – This is the title of the study published in the link you provided. I have written it in sentence case, which is appropriate for most contexts. Title case, where each word is capitalized except for minor words, is also commonly used for titles but is not always necessary.