TL;DR: the oncology part of the Watson project appeared to be working fine. The integration with MD Anderson BSS/OSS systems was the killer, especially since MD Anderson changed horses mid stream.
Integration with Business Support Systems and Operational Support Systems is the part where the customers make their raw data available to Watson, and Watson provides analyses/diagnoses in return. This data will usually arrive in proprietary formats and need to be delivered in proprietary formats, meaning integration is a bespoke operation for each customer, and will need to be done from scratch if the customer changes BSS in the meantime.
Integration with Business Support Systems and Operational Support Systems is the part where the customers make their raw data available to Watson, and Watson provides analyses/diagnoses in return. This data will usually arrive in proprietary formats and need to be delivered in proprietary formats, meaning integration is a bespoke operation for each customer, and will need to be done from scratch if the customer changes BSS in the meantime.