Dark stocks are difficult to research, if you can't even find the company's actual website, or recent news, you probably aren't cut out for investing in dark companies.
A deeper look into market news shows that the company is alive and well, but they are not up to date with SEC filings, and have gone dark on the news wires until they get caught-up.
If you were capable of researching the market for cardiac PET, you would see cardiac PET testing is gaining traction and is expected to take market share from SPECT in the coming years.