Lastly, Yassin et al (2021) evaluated the effect of Ramadan fasting among chronic myelogenous leukemia (CML) patients receiving tyrosine kinase inhibitors (TKIs) by evaluating their clinical course, hematological parameters, and BCR-ABL1 levels, and found that Ramadan fasting had no effect on CML control. Here, BCR is linked to chronic myelogenous leukemia, BCR-ABL1 positive.