Steven J. Isakoff, MD, PhD
An expanded indication for the Paxman Scalp Cooling System to include the prevention of chemotherapy-related alopecia in patients with solid tumors will increase the population eligible for the therapy dramatically and allow for more personalized treatment options, according to industry and academic experts.
In June, the FDA agreed to extend the approval for the device under the 510k program from patients with breast cancer in danger of hair loss to those with any solid tumor based on additional clinical evidence from studies in breast, lung, prostate, ovarian, and gastrointestinal cancers.1
The expanded approval will increase the number of newly diagnosed patients who can use the system from roughly 250,000 per year to more than 1 million, the Paxman company said in a statement.
“Scalp cooling has been a real game-changer for so many of our patients with breast cancer, minimizing the risk of one of the most dreaded [adverse] effects of chemotherapy,” Steven J. Isakoff, MD, PhD, a clinical and translational investigator in the breast oncology center at Massachusetts General Hospital in Boston, said in a press release. “We are already working on plans to make this available to all of our patients with solid tumors.”
Debu Tripathy, MD, who has investigated the psychological impact of alopecia on patients undergoing chemotherapy for metastatic breast cancer, also praised the agency’s decision. “This is another step forward in making cancer therapy more personalized and putting the patients in the driver’s seat as we create more options and pathways for our patients,” said Tripathy, professor and chair of breast medical oncology at The University of Texas MD Anderson Cancer Center in Houston, in a statement.
The Paxman system, initially approved in April 2017, is the second scalp cooling system granted FDA approval for broad solid tumor indications. The agency approved the DigniCap System for patients with breast cancer in December 2015 and expanded that indication to include all solid tumors in July 2017.
Clinical Trial Data
The original breast cancer approval for the Paxman system was based on results from the SCALP trial (NCT01986140) first presented at the 2017 American Society of Clinical Oncology (ASCO) Annual Meeting and subsequently published in JAMA
The investigators assessed hair preservation in 95 women assigned to scalp cooling versus a control group of 47 women who did not receive cooling.
The trial was stopped early following a preplanned efficacy analysis of 142 participants. Investigators will follow participants for 5 years post study to assess time to first recurrence, site of first recurrence, and overall survival. Secondary endpoints included change in quality of life and use of wigs or head wraps.
Eligible patients with stage I-II breast cancer were treated with neoadjuvant or adjuvant anthracyclines or taxanes for at least 4 cycles. Patients who had migraines, hypothyroidism, or anemia were excluded, as were patients with any other uncontrolled medical condition.
The mean patient age was 50.8 years, and 79.9% of the cohort was white. Sixty-three percent of patients were treated with taxanes, and 37% received anthracycline-based treatment. Most women (62.5%) had stage II disease, and 37.5% had stage I tumors.
After 4 cycles of treatment, the rate of hair preservation was 53.1% in the experimental group compared with 0% in the control group (P
<.0001). Following completion of chemotherapy (4-8 cycles), the rate of hair retention in the cooling arm was 46.2%.
Women assigned to a taxane were more likely to preserve their hair after 4 cycles (63% vs 24.1%) and after completion of treatment (64.6% vs 0%). The rate of hair preservation after completion for patients who received both classes of drugs was 15.6%. The rate of hair preservation was 100% for patients assigned to paclitaxel alone (n = 7) or in combination with 6 area under the curve AUC of carboplatin (n = 1). In the cooling arm, 44.6% of patients used a wig or scarf compared with 68.5% in the control group. Among patients with grade 2 (>50%) hair loss, wig or scarf use was unknown for 20% of patients in the experimental arm versus 31.5% of the control group. No woman in the control group was known to go without a scarf or wig compared with 33.9% of the cooling group.
There was no difference in quality of life scores between the 2 arms or between those who had alopecia and those who retained their hair. All adverse events associated with the cooling system were grade 1/2. Following 4 cycles of chemotherapy, 4.8% of patients experienced headache and 1.2% experienced nausea.