The number one post actually comprises two abstracts:
A recent physical approach to angiogenesis modeling: mixture models
Modeling the Dichotomy of the Immune Response to Cancer: Cytotoxic Effects and Tumor-Promoting Inflammation
A deterministic model for the occurrence and dynamics of multiple mutations in hierarchically organized tissues
Cooperation and competition in the dynamics of tissue architecture during homeostasis and tumorigenesis
Cancer initiation with epistatic interactions between driver and passenger mutations
Please, keep spreading the word, and let us know if you find any preprints that we've missed. With +PeerJ, the +bioRxiv, +F1000 and the +arXiv there are more and more out there!