We ran cancer coordination by hand for years. Then we wrote it down as software.
Arca comes out of House Medicine's transplant and cancer programs in California: five clinical sites, community settings, and patients whose care crossed organizations that shared no systems. The clinical team did the coordination itself, by hand. Arca is that work as software.
In March 2020, two of the founders reopened a closed Los Angeles hospital in under two weeks.
The 366-bed Los Angeles Surge Hospital went from lease negotiation to receiving COVID patients in under two weeks, with Dignity Health, Kaiser Permanente, LA County, and the State of California. One clinical team owned every step of every patient's care, because there was no one else to hand anything to.
That is the operating experience under Arca: coordination as the clinical team's own job, with nothing between the decision and its execution. The software exists so a program gets that without reopening a hospital.
The founding team and the House network.
Anand Annamalai, MD, FACS
CEO and co-founder. Transplant and HPB surgeon; thousands of complex cancer surgeries and 100+ peer-reviewed publications. Built cancer programs at Cedars-Sinai and in community settings; founded House Medicine, House Health, and House Transplant & Cancer.
Elise Diner, PA-C
Co-founder, operations and partnerships. Twelve years in surgical oncology and transplant. Built and operates House Medicine's cancer programs across five California locations.
Jamie Taylor, MD
Co-founder, clinical strategy. Anesthesiologist; directed multiple transplant ICUs, including the Surge Hospital's.
Chris Hoyd, JD
VP strategy and innovation. Healthcare law, tech startup formation, enterprise commercial architecture.
Braj Baheti
Director of product and technology. Owns Arca's full build lifecycle, with a 17-person product, engineering, AI, QA, and design team.
The House ecosystem
House Medicine (clinical practice, five California sites), House Health (the Integrated Oncology Network), and House Transplant & Cancer (a 501(c)(3) active in 15+ countries). Arca is the coordination layer they ran first.
Where Arca is deployed, and who we are talking to.
Statuses as of September 2026. Arca is live at House Medicine's California cancer programs, in conversations with risk-bearing groups and health plans, and expanding through 2027.
The network it grew out of
Five rules the product follows.
A task completes when the referral confirms, the scan schedules, or the infusion documents, with a date. Everything else is still open.
Overdue and going-quiet are calculated from the record when you look. A flag can't be stale, and clearing one means the work actually happened.
Capture at the table is the coordinator's work. Adding data entry to the physician's meeting would kill the meeting.
What was decided, who owns the next step, when it's due, and whether it happened. Clinical documentation stays in the EHR.
Patient examples and workspace figures are invented and labeled. Platform and partner figures are ours; published figures carry their sources.
Tell us which tumor boards you run.
Which boards, how often they meet, and who carries the follow-through today. We reply within two business days with how Arca would run alongside them, starting with one board.