Bespoke circulating tumor DNA as a biomarker for treatment response in a refractory Merkel cell carcinoma patient - John Yeakel, MD; Aarthi Kannan, BA; Nicole Hook Rattigan, PhD; Maki Yamamoto, MD; Alexey Aleshin, MD, MBA; Jeremy P. Harris, MPhil, MD; Ling Gao, MD, PhD (Elsevier, 2021)