Could an herbal patch ease pain after cancer?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Age ≥ 18 years or older * A diagnosis of cancer with no restrictions placed on type of cancer or stage. Eligibility criteria will not be restricted to MSK confirmed biopsy/diagnosis. Participating institution's testing is sufficient for other study sites * Completed active treatment (surgery, chemotherapy, and/or radiotherapy) at least one month prior to study initiation (patients on continued hormone treatment or maintenance targeted therapies will not be excluded). * Patients currently have no evidence of disease * Ambulatory (Karnofsky functional score of ≥ 60) * Having a focused location of regional musculoskeletal pain (e.g. joints, extremities, back, neck) that can be covered by one patch of PRP * Worst pain score (numeric pain rating scale) 5 or above in the preceding week * Pain for at least 3 months and at least 15 days with pain in the preceding 30 days; and willingness to adhere to and understanding of all study-related procedures, including randomization to one of the two possible choices * Able to understand informed consent and provide signed informed consent form Exclusion Criteria: * Patients with non-musculoskeletal pain syndromes (headache, facial pain, chest pain, visceral abdominal pain) will be excluded if these are the sole source of pain but can be present as co-morbid conditions as long as a patient has a primary musculoskeletal pain condition defined as above. * Patients have generalized musculoskeletal pain such as fibromyalgia * Use of corticosteroid drugs by any route of administration within 30 days * Patients with significant self-reported skin disorders * Patients with open wounds, infections, skin trauma at skin overlying area of pain * Patients with documented history of skin sensitivity to adhesive or allergic reaction to other patches or topical analgesics * Patients with documented skin allergic reaction to plants or herbs * Patients who are in active treatment (chemotherapy, surgery, radiotherapy) * Plan to change or initiate other pain medications or interventions (e.g. physical therapy, acupuncture, injection). Patients may remain on their current pain regimen.