Pfizer, which previously backed Reflexion's $11.6m series A round in 2014, has returned to increase its commitment in the medical device manufacturer.

US-based medical equipment producer Reflexion Medical closed a $46m series B round yesterday featuring pharmaceutical firm Pfizer’s corporate venturing subsidiary, Pfizer Venture Investments.

The round was led by family investment fund KCK Group and also included venture capital firms Venrock and Sofinnova Partners.

Reflexion Medical is working on biology-guided, personalised radiotherapy technology that uses anatomic and functional imaging data to track tumours. The approach means radiation can be targeted at lesions at a higher intensity without damaging the surrounding, healthy…