Tumor treatment remains a prominent area of biomedical research.The researches surrounding the adverse
reactions and targeted efficacy of various chemotherapy drugs and other therapeutic drugs have driven the development of various drug carriers.These carriers focus on increasing drug concentration at tumor site,minimizing systemic adverse reactions,and improving treatment outcomes.In the reported delivery systems,injectable hydrogels have become an important carrier for the delivery of chemotherapeutic drugs in vivo due to their minimally invasive characteristics.This review systematically summarized the types and characteristics of injectable hydrogels,and further summarized their drug loading methods.At the same time,the application of injectable hydrogels in the delivery of various drugs for tumor treatment was discussed in depth.This review provides dynamic and prospective reference for the potential challenges and possible solutions of the in situ injectable hydrogels for tumor therapy.Injectable hydrogels as drug delivery systems are with good prospects for tumor treatment.