Brain Tumor Investment Fund is a Newton, Massachusetts-based venture philanthropy fund affiliated with the National Brain Tumor Society that makes equity investments in biotechnology, pharmaceutical and medical device companies developing treatments and enabling technologies for brain tumors and related oncology indications. It invests in the United States across seed, early-stage and later-stage venture rounds, with a focus on helping high-impact therapies and technologies cross the commercialization valley of death and recycling investment gains back into the fund.