FDA Committee Gives New Cancer Surgery Tech a Positive Vote
A new drug-device combo aimed at detecting residual cancer in real time during lumpectomy is one step closer to gaining federal approval, but some physicians aren’t convinced the technology is safe — or effective enough — to start using on patients.
A majority of the US Food and Drug Administration’s Medical Imaging Drugs Advisory Committee (MIDAC) on March 5 voted in support of LUMISIGHT’s (pegulicianine) benefit-risk profile.
LUMISIGHT is an optical imaging agent used in combination with Lumicell Direct Visualization System (DVS), a fluorescence-guided imaging system. The technology, developed by Lumicell Inc., helps surgeons identify cancer that may remain in the breast after they’ve completed the main resection of tissue.
Following MIDAC’s positive vote, the FDA will move on to reviewing Lumicell’s new drug application for LUMISIGHT and its premarket approval application for Lumicell DVS.
“We are proud of the efforts and look forward to the next steps as we work with the FDA to finalize the approval process so that women with breast cancer can access the therapy,” Jorge Ferrer, PhD, Lumicell’s chief scientific officer, said in an interview.
However, Freya Schnabel, MD, professor of surgery and director of breast surgery at NYU Perlmutter Cancer Center, said there are some “real concerns” with the technology. She expressed surprise at MIDAC’s overall favorable vote.
In a recently published study, she noted that the use of pegulicianine fluorescence-guided surgery (pFGS) did not meet the prespecified threshold for sensitivity.
“It did meet thresholds for removal of residual tumor and specificity — but this is still basically a negative study, and a low sensitivity raises concerns regarding false negative readings,” she said in an interview. “I’m surprised [the committee] is supportive in light of this result. Also, the technique is logistically challenging, as patients need to be injected 2 to 6 hours before their surgeries, very challenging timing for patients having ambulatory procedures.”
The study, published in the April 2023 NEJM Evidence, analyzed 357 patients who received 1.0 mg/kg intravenous pegulicianine followed by lumpectomy. Tumor left behind after standard lumpectomy was removed in 27 of 357 patients through use of pFGS. Of the 27, 22 patients had cavity orientations deemed “negative” on standard margin evaluation, according to the study. A margin is described as negative or clean when there are no further cancer cells at the edge of the tissue, suggesting that all of the cancer has been removed. Second surgeries were avoided by pFGS in 9 of 62 patients with positive margins, the analysis found.
On per-margin analysis, pFGS specificity was 85.2%, and sensitivity was 49.3%. While the sensitivity endpoint missed the lower boundary of the 95% confidence interval, the LUM system exceeded the specificity endpoint of 60% with a point estimate of 86%, and an accuracy of 84% for imaging residual cancer in the lumpectomy cavity, coinvestigator E. Shelley Hwang, MD, MPH, said during the MIDAC meeting.
“The pivotal study was an adequate and well-controlled study demonstrating the effectiveness of the LUM system to detect residual cancer in the lumpectomy cavity, following the standard of care procedure,” she said. “These results also demonstrate clinical benefit that improves the current standard of care. This is the first and only imaging system that provides results in the lumpectomy cavity in real time, allowing surgeons to use this information at the time of the initial procedure.”
Is the Technology Safe?
Pegulicianine is an imaging agent that contains a fluorescent dye. The agent is given to patients as a 3-minute intravenous infusion 2 to 6 hours before surgery.
After removal of the main tumor specimen, the surgeon inserts a handheld probe into the breast cavity and in combination with the detection software, searches for residual cancer that may have been left behind, Dr. Ferrer explained during the MIDAC meeting.
If the software identifies areas suspicious for residual cancer, those areas display in red on an overhead screen. The surgeon then takes a targeted shave to resect the suspicious tissue. Once the tissue has been removed, the surgeon can rescan the cavity with the probe to ensure a more complete resection has been performed. Use of the LUM system typically takes surgeons less than 7 minutes to use, Dr. Ferrer said.
In the study, a total of 406 patients received the intravenous pegulicianine, but 14 patients were withdrawn before randomization. After a standard lumpectomy procedure, 357 patients were assigned to the pFGS group and 35 patients to the control group.
Of the 406 patients, pegulicianine administration was stopped for adverse events in 6 patients (1.5%). Two patients had grade 3 serious adverse events related to pegulicianine; one had hypersensitivity, and one had an anaphylactic reaction. The other four pegulicianine-related adverse events included allergic reaction, milder hypersensitivity, nausea, and pegulicianine extravasation.
Dr. Schnabel said these reactions are worrisome. While any effort to reduce the need for patients to have more than one surgery to complete a breast conserving approach would be a “real advance,” Dr. Schnabel said she would not feel comfortable using pFGS in her own practice if approved by the FDA as is.
“This is clearly a major issue in terms of incorporating this technique into practice,” she said. “I could go on, but in light of the above, I’m surprised that [the committee] is supportive. I would hope for some refinement of the technique to reduce the risks to patients and improve the results before I’d consider utilizing this approach.”
During the MIDAC meeting, Dr. Ferrer said the company takes the safety events seriously and has developed mitigation strategies to further reduce the risk of patient hypersensitivity. These strategies include: clear labeling that informs users of anaphylaxis risk, incorporating a new section into the device training program to address warnings and precautions, an enhanced pharmacovigilance program to closely track and report hypersensitivity events, and a postmarket study to access the incidence rate and risk of such events in a broader population.
Several MIDAC members raised questions about the adverse reactions observed and about the safety of the technology.
David B. Hackney, MD, a neuroradiologist at Beth Israel Deaconess Medical Center in Boston, questioned the recommendation that patients only be monitored for 15 minutes after the injection.
“Since you don’t have enough data to know how long after injection reactions could occur, why not keep them under monitoring until after the surgery is over?” he said.
Barbara Smith, MD, PhD, lead investigator of the study, explained that per the protocol, there would be frequent monitoring, with a nurse at bedside, and patients would be monitored after injection, on their way to the procedure, and afterward.
She suggested, during the meeting, that more intense monitoring early in the process would be beneficial as that is when investigators observed side effects believed to be attributed to LUMISIGHT.
MIDAC member Kimberly E. Applegate, MD, a retired radiology professor, asked about the learning curve for surgeons and how long it generally takes for physicians to become familiar with the system.
Coinvestigator Kelly Hunt, MD, explained that all surgeons who participated in the trial completed a training program.
“Certainly, there’s a learning curve anytime we introduce new technology in the operating room,” she said. “Surgeons said it usually takes about three procedures before they’re comfortable with the system, including the camera and the software.”
During a presentation period by FDA officials, Anil Rajpal, MD, MPH, FDA, Deputy Division Director for Safety, said it’s important that prescribing information for LUMISIGHT communicate the risk of anaphylaxis and other hypersensitivity reactions, the need to monitor patients, and the need for the appropriate available personnel, medications, and equipment.
“This would be done by warnings and precautions and a boxed warning,” he said. “Note, that [such warnings] would only communicate the risks, it would not further characterize the risk.”
Committee Expresses Support
During a subsequent vote among committee members, most expressed support for the technology and its benefits. Sixteen members voted in support, one abstained, and two voted against the benefit-risk profile.
Andrea Richardson, MD, PhD, professor of pathology at Johns Hopkins in Baltimore, said she voted yes because the incremental benefits of avoiding additional surgeries outweigh the small risk of anaphylaxis.
Henry Royal, MD, MIDAC chair and professor of radiology at Washington University School of Medicine in St. Louis, agreed.
“Even though the benefit of this is on average, quite small, the benefit to the woman who has positive margins that’s converted to negative margins because of use of [LUMISIGHT] is really quite great,” he said. “The risk from this procedure is certainly very manageable.”
Harold J. Burstein, MD, PhD, a professor of medicine at Harvard Medical School and oncologist at Dana-Farber Cancer Institute in Boston, voted against the benefit-risk profile. He said the technology merits more research and that he does not believe it was proven the technology reduces the risk of reoperation.
“I think it’s a great technology,” he said. “I would like to see a well-conducted, randomized, phase III study with the endpoint of reoperation,” he said. “That would really prove the usefulness and benefit of the intervention in my mind.”
Chengjie Xiong, PhD, professor of biostatistics at Washington University School of Medicine in St. Louis, chose to abstain from voting because he said there was not enough data.
The FDA will now complete its review of Lumicell’s new drug application for LUMISIGHT and review of its premarket approval application for Lumicell DVS. The FDA review team has 6-10 months to make a decision. As part of the process, the FDA will evaluate clinical data, travel to clinical study sites to conduct inspections, and assemble a final action package for a senior FDA official to make a final decision.
If deemed safe and effective, the FDA will then work with Lumicell on developing and refining prescribing information.
Dr. Ferrer said his team expects to receive FDA approval in the coming weeks and will continue to work collaboratively with the FDA to expedite approval where possible.
The purpose of the MIDAC is to review and evaluate data about the safety and effectiveness of marketed and investigational human drug products for use in diagnostic and therapeutic procedures using radioactive pharmaceuticals and make appropriate recommendations to the FDA Commissioner.
This article originally appeared on MDedge.com, part of the Medscape Professional Network.
