The correct answer is B: This most likely represents a well-described adverse reaction to gemcitabine(Drug information on gemcitabine); the patient can continue therapy as long as symptoms are tolerable.
Discussion: Gemcitabine, a potent deoxycytidine drug, has been used both as a single-agent chemotherapeutic regimen as well as in combination with other cytotoxic drugs. It is particularly useful for management of non–small-cell lung cancer, bladder cancer, pancreatic cancer, and breast cancer. This drug has also emerged as a tool in the treatment of ovarian cancer.
Although its toxicity profile can vary based on administration schedule and individual patient factors, gemcitabine is a relatively well-tolerated drug. Severe anemia, neutropenia, and thrombocytopenia occur in single-digit percentages, and neutropenic fever is quite uncommon. While nausea, vomiting, and diarrhea may occur commonly, they are typically mild to moderate in severity. Deep venous thrombosis occurs in 3.6% of patients. Fever and associated flulike symptoms are seen in about one-third of patients treated with this drug, and dyspnea, sometimes severe, is encountered in about 4% of patients. Rare but potentially fatal hemolytic-uremic syndrome occurs in less than 1% of patients.
Among the non-hematologic toxicities, cutaneous reactions to gemcitabine are common. A nonspecific, pruritic rash may appear in just over a quarter of patients. Radiation recall dermatitis may occur. Unrelated to cardiac, renal, or hepatic failure, edema is reported in some 24% of patients; it most often affects the extremities. This may vary from minimal swelling to frank +4 pitting edema, and may or may not be associated with overlying erythema. Edematous areas may be asymptomatic or spontaneously painful and tender to the touch. This type of reaction can be fairly widespread and thus closely mimic bacterial cellulitis. Conversely, the reaction can be very localized and thus closely mimic erysipelas. The precise pathophysiology of gemcitabine-induced edematous states remains obscure, although increased vascular permeability due to endothelial cell damage has been hypothesized. Fortunately, edema is severe enough to require drug withdrawal in only 1% of all cases so affected.
Before making the diagnosis of gemcitabine-induced edema, organ failure, deep venous thrombosis, venous or lymphatic obstruction due to abdomino-pelvic neoplasia, and bacterial cellulitis must be entertained and ruled out as completely as possible. Electrolyte and chemistry panels, a Doppler ultrasound, an echocardiogram, abdominal CT scan, and blood and tissue aspirate cultures are all reasonable tests to perform, along with a thorough physical examination. The bilaterality of edema in this patient, for example, speaks against DVT and cellulitis, while favoring an obstructive or drug-induced phenomenon.
Treatment of edema is multifactorial. Conservative measures nearly always instituted include: salt restriction, leg elevation, compressive stockings, and diuretics. Corticosteroids or antihistamines may be added for more severe reactions. Administration of corticosteroid premedication may reduce the incidence of adverse events, including edema.
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