multiple myeloma ( mm ) is a neoplasm of plasma cells within the bone marrow . despite the significant improvements in patient outcomes as a result of drug therapies with immunomodulators , high - dose chemotherapy ( hdct ) with stem cell rescue ( sct ) and proteasome inhibitors , resistance to treatment ultimately develops and mm remains incurable . a major impact on improving survival in mm has been the use of the boronic acid - derived proteasome inhibitor bortezomib , a first - in - class selective inhibitor of the 26s proteasome . wide usage of bortezomib in patients with mm based on its potent antimyeloma effects even in prognostically challenged mm patients resulted in better understanding of the side effects of this drug . the most frequent ( in > 30% of patients ) of these drug - associated toxicities include : fatigue , generalized weakness ; peripheral neuropathy characterized by decreased sensation and paresthesia in hands and feet , nausea and vomiting , diarrhea , poor appetite , constipation , anemia and thrombocytopenia . unfortunately , some of these effects interrupt with treatment schedule , dose reduction , or discontinuation even in the absence of drug resistance . it is therefore important to understand and treat potentially new side effects in order to be able to deliver best advantage that bortezomib can provide in drug - sensitive patients with mm . we present 2 patients with active mm in whom persistent chalazia became a therapy - interfering complication of treatment with bortezomib . both patients had relapsed iss iii b kappa (  ) light chain myeloma , both patients were responding to treatment with bortezomib until chalazia which caused intolerable discomfort , started . in both patients discontinuation of bortezomib was necessary for chalazia to heal , and restarting of bortezomib was associated with relapse of chalazia . a 56 year old african - american female presented in 2006 with a 2 month history of worsening pain in rib cage and upper back . complete blood count displayed : white blood count ( wbc ) 2990/mm with normal differential , hemoglobin ( hb ) 12.5 g / dl , platelet count 144,000/mm ; blood urea nitrogen ( bun ) 50 g / dl , serum creatinine ( cr ) 5.6 mg / dl , calcium 10.2 mg / dl , b2 microglobulin 16.5 mg / l and albumin 3.0 mg / dl . bone marrow biopsy showed 6% monotypic plasma cells expressing  light chains with normal cytogenetics . she was diagnosed with iss stage iiib  light chain myeloma was treated with upfront thalidomide 200 mg per os / day , dexamethasone 40 mg per os /week and doxil 20 mg / m intravenously , with the intention to receive hdct and asct . after 4 cycles ( 120 days ) she achieved a very good partial remission ( vgpr ) with disappearance of the -light chains in the urine by immunofixation and resolution of 50% of the skeletal lytic lesions . however , returned to clinic on january of 2014 with a painful new rib lytic lesion detected on x - ray . serum free  light chains were 3020 mg / l and free  light chains were 8.30 mg / l with a / ratio of 364 . after 2 cycles ( 36 days ) she developed bilateral subcutaneous mildly tender , extremely itchy upper eyelid lesions 710 mm that were diagnosed by ophthalmology as acute chalazia ( figure 1a , b ) with coexisting mild conjunctivitis . bortezomib was held , and the eye the lesions were managed conservatively with warm saline compresses applied tid at home by the patient . bortezomib was restarted after a 2 week lapse , as she had symptomatic relief from ophthalmic treatment , chalazia decreased in size by > 75% and conjunctivitis cleared . after the second week of bortezomib reinitiation additional multiple bilateral chalazia with painful conjunctivitis developed , at which point bortezomib was held another week and she ophthalmology prescribed topical tobramycin / dexamethasone eye drops applied tid during the day and in ophthalmic ointment form to be applied at night , along with continued use of warm compresses . this treatment led to improvement of her eye lesions while on bortezomib ( figure 1c ) . patient currently continues to receive bortezomib 1.3 mg / m weekly with dexamethasone 20 mg / week and uses topical tobramycin / dexamethasone eye drops . her most recent serum free  light chains are 2284 mg / l and free lambda (  ) light chains are 13.20 mg / fish showed gain of 1q21 ; monosomy 13 ; gain of 9 , 15 and gain of fgfr3/4p , ccnd1/11q , igh14q sequences ; and loss of maf/16q , indicating that biology of her disease had changed for the worse since 2006 . a 70-year - old african - american male presented in august , 2013 with left shoulder pain and inability to move his left arm . on physical exam , he had severe tenderness on palpation at the humoral shaft , and was unable to perform any movement complete blood count displayed wbc 6200/mm and normal differential , hb 14.9 g / dl , platelet count 194,000/mm ; serum bun 11 g / dl , cr 1 mg / dl , b-2 microglobulin 3.5 mg / l , ca 9.2 mg / dl . serum free  light chains were 1430 mg / l and free  light chains were 8 mg / l with a / ratio of 175 . skeletal x - ray survey revealed diffuse lytic lesions and a pathological fracture of the left humeral shaft . he underwent bilateral femoral shaft and right humerus fixation surgeries , followed by palliative radiotherapy to bilateral shoulders and femurs . patient was next started on systemic treatment with lenalidomide 25 mg per os daily day 1 - 21 , dexamethasone 40 mg day 1 , 8 , 15 , 22 ( q 28 days ) with zoledronic acid 4 mg iv monthly . he had partial remission ( pr ) to treatment after 2 cycles as evidenced by persistence of free light chains in the urine . he was switched to bortezomib 1.3 mg / m sc , cyclophosphamide 300 mg / m and dexamethasone 40 mg per os weekly ( vcd ) . after second cycle of vcd , he developed redness and swelling of both eyelids with a single nodule with central crusting , this was diagnosed as a chalazion by ophthalmology . he was initially treated with warm saline compresses but his symptoms did not improve with conservative management . he subsequently required incision and drainage of one of the lesions , with tobramycin / dexamethasone eye drops and oral doxycycline treatment leading to resolution of the chalazion over 1 month . he was continued on the bortezomib based regimen and after the fourth cycle , however , he developed multiple bilateral chalazia leading to significant treatment delay . patient elected to stop treatment after 6 cycles due to grade iii diarrhea on bortezomib . at six bortezomib s antimyeloma effect is largely due to inhibition of endoplasmic reticulum - dependent degradation ( erad ) of excessively synthesized abnormal ( myeloma ) m proteins , which provoke er stress and cause apoptosis . when used as a single agent , and especially in combination with other antimyeloma agents , bortezomib is robustly effective , and is fda approved in the treatment of upfront , relapsed and refractory mm , and in patients who have previously responded well to bortezomib . despite its wide usage , there have been few reports of ocular side effects of bortezomib . chalazion or meibomian cyst is a benign lipogranulomatous collection which arises from one of the meibomian glands lining the tarsal plate of the eyelid . it is caused by lipid inspissation in the meibomian glands , which ruptures and releases lipid from the gland into the surrounding tissues . this leads to a granulomatous inflammatory reaction . as described in the two cases presented here , patients present with eyelid edema , tenderness and a lump on the eyelid developing over weeks . about 46% of chalazia resolve with conservation management with hot compresses , but in refractory cases , topical or intralesional steroids , oral doxycycline and surgical excision , have been used . this case report sheds light on the association between bortezomib with chalazia . since the approval of bortezomib for mm in 2003 , it has now become an important backbone of major treatment regimens in frontline as well as relapsed mm patients who were refractory or nonrefractory . the addition of bortezomib has contributed significantly to the survival of mm patients at all prognostic stages of their disease . it is important to monitor and detect potential side effects so as to maximize the benefit by avoiding side effects that lead to dose reduction or discontinuation and allow patients to have full benefits of this agent . chalazion is a lesser known side effect of this drug which may be due to under - reporting . one phase ii study of bortezomib with rituximab in relapsed refractory waldenstrom s macroglobulinemia reported 6 of 37 ( 16% ) patients with conjunctivitis / chalazia although no distinction was made between the two . grob sr et al . reported a case series of 6 patients who developed chalazia while on bortezomib therapy with a mean 3.3 months after exposure ( range 1 - 6 months ) . four patients underwent incision and curettage and 5 of 6 patients had bortezomib suspended or discontinued owing to eye discomfort in the case series . in our patients the mean time to development of chalazia after start of bortezomib was 30 days . it is unclear if this is a coincidental finding or if this side effect is more common or exclusive to light chain or specifically -light chain mm . it led to treatment delay in both our patients and one patient required surgical intervention . we therefore recommend careful eye exam , an ophthalmology consultation as symptoms or signs of itching or redness present . early detection and rapid treatment with topical corticosteroid eye drops during the day and in ointment form at night in addition to excellent eye hygiene by conventional warm compress and by frequent hand washing is a reasonable approach in order to minimize treatment delay . in those patients in whom chalazia persist or relapse after the preceding therapy it may be prudent to either switch to other proteasome inhibitors or consider surgical intervention for the chalazia . the use of topical prostaglandin analogues in glaucoma and docetaxel in prostate cancer has been described . two plausible hypotheses suggested were either direct stimulation of meibomian gland secretion or meibomian duct inflammation and blockage . a viral etiology has also been described as causing chalazia . herpes , epstein - barr and adenovirus have all been reported to infect the eyelid sebaceous glands . the authors theorize that perhaps bortezomib facilitates viral infections such as herpes zoster thereby promoting chalazia .
multiple myeloma ( mm ) is a neoplasm of plasma cells within the bone marrow . 
 a major impact on improving survival in mm has been the use of the boronic acid - derived proteasome inhibitor bortezomib , a first - in - class selective inhibitor of the 26s proteasome . 
 ocular side effects of bortezomib are rare . in this report 
 , we present 2 patients with active mm in whom persistent chalazia became a therapy - interfering complication of treatment with bortezomib . 
 both patients had relapsed iss iii b kappa light chain myeloma , and they were responding to treatment with bortezomib until chalazia  which caused intolerable discomfort  started . in both 
 patients discontinuation of bortezomib was necessary for chalazia to heal , and restarting of bortezomib was associated with relapse of chalazia .