Octagon Research Solutions, one of the Philadelphia region’s largest clinical research organizations, is getting ready to add 100 clinical and regulatory professionals to its global staff, including 30 positions in Wayne, Pa. The hiring plan includes expanding its headquarters in Wayne and broadening its presence in Europe and in the Asia-Pacific region with new facilities in the United Kingdom and in India. A company spokeswoman said Octagon plans to add “at least” 30 workers in Wayne, where it has about 300 employees.