Your intuition here is great.

1. Nano bots -- no idea; outside my wheelhouse.

2. Liquid Biopsy -- many companies are working on diagnostic tests to detect cancer early, monitor treatment, detect recurrence, etc. Some of these products are already available but most are in R&D phase.

3. Immuno-Oncology -- the most promising development in cancer treatment in a long time. Successful tumors evade the immune system by essentially hiding themselves. Many companies are working on treatments to assist immune system in different ways. Some products have been in the market for a while now and have been pretty successful.