The primary care physician (PCP) is frequently the first point of contact for patients with cancer, and thus serves a vital role in detecting symptoms, making diagnoses, and facilitating initiation of treatment. There is an extensive literature regarding PCP referrals for solid tumors, especially for malignancies such as breast and gastrointestinal cancer where there are abundant evidence-based screening guidelines.(1
) In contrast, little is known about referrals for suspected hematologic malignancies,(5
) such as the frequency of such referrals, their clinical triggers, the factors that influence the choice of hematologist, and the quality of information exchanged. Especially in the case of chronic hematologic malignances such as myelodysplasia, multiple myeloma, follicular lymphoma and chronic lymphocytic leukemia, PCPs may have a lack of knowledge of so-called “alarm symptoms,” and sparse experience with relevant diagnostic workups.(6
) As even chronic blood cancers can be lethal and are increasingly treatable,(8
) prompt and efficient referral by PCPs for suspected hematologic malignancies is likely to improve care.
We aimed to survey a broad sample of PCPs as to their referral practices for suspected hematologic malignancies. We first sought to evaluate their approach to anemia (both singly and in combination with subsequent clinical findings), as anemia is a common first presenting sign for hematologic cancers. We then aimed to characterize how often PCPs suspect hematologic malignancy, the frequency and type of resulting consultation, the factors that affect their choice of hematologist, and the quality of information exchanged upon referral. Finally, we were also interested in how PCPs perceive their own ability to diagnose and treat these disorders, how often referrals have been completed when patients are seen in follow-up, and ultimately, how PCPs view the quality of the referral system within which they operate.
134 (70.5%) of 190 eligible Massachusetts PCPs completed surveys; 37 opted out either by postcard or when contacted by telephone, and the remaining 19 never responded. Most respondents were male (58.7%) and identified as internists (67.7%). PCPs were approximately evenly-distributed with respect to academic affiliation, with 21.1% reporting no affiliation with an academic center and 17.3% reporting being full-time faculty. The median reported patient panel size during the prior twelve months was 1800 patients, and the median percentage of patients ≥ 65 years was 30.0% (Supplementary Table 1
Clinical actions for isolated anemia are shown in ; clinical actions for persistent anemia and one additional sign or symptom are shown in . Of note, among patients most likely to be referred to a hematologist (those with pancytopenia, thrombocytopenia or leukopenia), PCPs reported recommending low levels of two-week follow-up in addition to the referral (10.6%, 16.7% and 15.6%).
PCP’s First Reported Clinical Action when Patient Presents with New-Onset Anemia (Hg = 80% of normal)*
PCP’s Reported Clinical Actions when Patient Presents with Persistent Anemia (Hg = 80% of normal) and One Additional Sign or Symptom*
Among all respondents, the median number (IQR) of patients in the prior 12 months suspected of having a hematologic malignancy was 5 (3, 10); of those suspected patients, the number formally referred to a specialist was 5 (3, 10) and the median number to receive curbside consultation was 0 (0, 0). PCP characteristics associated with higher levels of suspicion of hematologic malignancies are reported in . Accounting for panel size, PCPs with stronger academic affiliation reported being more suspicious of hematologic malignancy than other physicians, while PCPs with a higher proportion of patients in managed care as well as those who were more recent graduates reported suspecting fewer patients of having hematologic malignancy. also details PCP characteristics associated with curbside consultation and formal referrals, adjusting for the number of patients suspected to have hematologic malignancy.
Associations of PCP Characteristics with Number of Patients Suspected of Having Hematologic Malignancy, Curbside Consultation Requested, and Formal Consultation Requested*
When considering to whom to refer, respondents rated specialist reputation (96.2%) as most important, while the possibility of losing a referred patient to a specialist was rated as least important (15.8%; Supplementary Table 2
). Among respondents who did not report “always or usually” writing a formal letter and/or an email (49.6%), 62.5% reported “always or usually” giving a patient test results to take to the specialist meeting (Supplementary Table 3
). Thus, 18.9% of all patients were reportedly sent to hematologic specialists with no documentation (email, letter, or test results given to patient). Finally, 38.4% of respondents reported that patients have not seen the specialist “always, usually or sometimes” at the time of PCP follow-up, although only 2.3% reported that this “always or usually” occurs.
We found that PCPs were highly suspicious of hematologic malignancies, reporting both suspecting and referring a median number of 5 patients per year out of a median annual patient panel size of 1800. This rate of suspicion and referral (278 per 100,000) greatly exceeds the national incidence rates of malignancies such as non-Hodgkin’s lymphoma (19.5 per 100,000)(12
) and myelodysplasia (3.5 per 100,000),(13
) and even that for all of the hematologic malignancies combined. Our data suggest that even in the absence of national screening guidelines, PCPs are performing an acceptable job in terms of suspecting hematologic malignancy and referring those patients to hematologists.
In our two-step anemia vignette, signs and symptoms suggesting myelodysplasia or leukemia most often prompted early referral, while those suggesting lymphoma were generally followed by imaging. This seems clinically reasonable, but still may result in delay of diagnosis and treatment by trained hematologic specialists. Interestingly, we found that an insistent family member could influence hematology referral for persistent anemia more so than night sweats, leukocytosis, or weight loss. We also found that several lower-cost and effective laboratory tests (e.g., reticulocyte count) were relatively underutilized, while over 25% reported obtaining colonoscopy as a first step. Taken together, these findings suggest that utilization of diagnostic anemia protocols may be a way to both improve care and decrease costs.
We found that recent residency graduates suspected fewer hematologic malignancies than other physicians, an observation that may be explained by their lack of clinical experience. Moreover, when younger PCPs did suspect hematologic malignancy, they more often formally referred patients and less often sought curbside consultation. We also found that PCPs with a high number of older adults in their practice suspected fewer hematologic malignancies. This was surprising given that hematologic malignancies are significantly more prevalent in older adults and the gap between so-called “alarm symptoms” and actual cases of malignancy is felt to be smaller in the elderly.(6
) This may be explained by the recent finding that even classic signs and symptoms of hematologic malignancy (such as anemia and back pain in multiple myeloma) can be effectively hidden by significant comorbidity, which itself is more likely in older adults.(14
Our respondents reported that approximately 1 in 5 hematology referrals are made without any formal documented information exchange. While our survey did not include every potential way for a PCP to contact a specialist (e.g., phone or shared medical record), these results suggest that there may be a gap in the flow of information between PCPs and hematology specialists. A recent national survey of 4720 PCPs and specialists found that while 69.3% of PCPs reported “always” or “most of the time” sending notification of the reason for referral, only 34.8% of specialists said they “always” or “most of the time” receive such information.(15
) The lack of formal referral letters, emails or even conveyance of test results may result in the specialist failing to obtain essential medical history (16
) and may also foster replication of costly tests and procedures.(17
) The former issue is especially important in hematologic oncology, as changes in blood counts over time—rather than absolute values at presentation—are often key to understanding potential progression of disease.
We recognize limitations to our work. First, our finding that the referral system for hematologic malignancies functions relatively well may not be completely generalizable to other states, especially ones that lack a large metropolitan region such as Boston (which contains several tertiary-care hospitals). Second, despite our excellent response rate (70.5%) for a physician survey, (18
) our overall sample size was limited, which reduced our power to assess some associations in our analyses. Third, our work may have been affected by participation bias, as the PCPs who answered our survey may have also been those physicians most likely to actively suspect hematologic malignancies. While participation bias is less of a concern when obtaining a high response rate such as ours, as with any cross-sectional survey, our study was also subject to recall bias (e.g., selective memory of referral behaviors), information bias (e.g., knowledge gap of patient panel demographics, digit preference bias) and social desirability bias (e.g., disinclination to report aberrant referral behaviors).
In summary, we found that anemia plus signs and symptoms suggesting of myelodysplasia or leukemia (as compared to lymphoma) are more likely to prompt early hematology referral, and that overall, there was an adequate level of suspicion for hematologic malignancy among PCPs. We also found a high level of formal referrals rather than curbside consultation, and PCPs reported that most referrals were completed upon follow-up. We thus conclude that despite the absence of specific guidelines for screening and surveillance, the overall referral system for suspected hematologic malignancies functions relatively well.