Only a biopsy can confirm cancer. A PET scan can suggest where there might be cancer and metastases but there are many things that can cause a high SUV number. Anything that irritates chemical or physical that can irritate the lungs will cause a high reading. Exercising before a PET can raise the reading.

If this was my body I would request a liquid biopsy to search for circulating tumor cells. If that high rating does mean it's cancer, something that metabolically active might have shed cells into the circulatory system.

Questions that can help us give you a better answer:
Was the first biopsy done by bronchoscope or needle?
What size was the nodule or mass on the CT that indicated the need for a biopsy?
Were both procedures done by a thoracic specialist?

Please let us know what you learn.